(outter) Ex. TORQUE Pryed it back, pryed it forward. The clearance is measured 90 degrees to the bearing parting line, which is the thickest part of the bearing (bearing thickness tapers slightly toward the parting line). ProFlange® is a line of bearing sets supplied with oversized flanges, allowing the thrust surface to be ground to 0.010″, 0.020″, or 0.030″ undersize. ft. 1/2 - 13 Main 20 lb. plugs (13/16 hex) Here you can see how load capacity is affected by bearing clearance. Although thrust bearing run on a thin film of oil; just like radial journal (connecting rod and main) bearings; they cannot support nearly as much load. Now torque the main cap bolts/studs with the oil pump, if so equipped. Typical values of end play can be calculated by the following formula: EP (mils) = 0.9 * Babbitt Outside Dia. Oil pan to front cover 2. This eliminates potentially excessive wear on the thrust bearing. Scientific testing has proven that the most effective bearing clearance is .002" or really close to that. We then measure the overall thickness of the thrust bearing end to end using a dial caliper. We pry back on crank using a long screwdriver, then zero the dial indicator and then pry the crank lightly forward to read the total clearance. (ALWAYS consult your piston manufacturer for recommended We’ve created a chart listing the popular V8 engines endplay clearances expressed as a range. The thrust-bearing surface, which is vertical in the engine block, can wear just like the main bearing face. This means the bearing shell is thinner, which creates 0.001 more clearance than a standard bearing. Let's say you measure 2.6500 on the journal with the outside micrometer, and 2.6525 with a dial bore gauge on the bearing. The oil film can be less than 0.001-inch and is accounted for in the final piston clearance. 25 lb. This produces maximum forward thrust on the crankshaft while attempting to start the engine. require a different torque than stock cast iron units. (Read 11091 times) smith772. We prefer to clamp the two bearings halves together by setting them flush on a flat surface (an aluminum plate for instance) and carefully tightening them with a large hose clamp (left). USE Tighter oil clearances produce less peak loading on the bearings and the engine runs smoother with less vibration. 25 lb. 85 lb. King's only products are camshaft bearings, connecting rod bearings, and main bearings. (in.) early rod bolts The 001 bearing is used when the clearance is needed to be tightened up by the one additional 0.001" of reduced clearance. Just like all other engine clearances, the thrust clearance is critical for proper engine performance. This puts the ideal clearance in the exact middle of the range. With a pry bar, push the crankshaft towards the front to align the thrust bearing surfaces. This slight chamfer will pull additional oil onto the loaded (rear) side of the thrust surface which will improve lubrication and reduce the thrust surface temperature. If there's enough room on the rod journals, worn thrust bearings can allow the crank to move forward or backward enough to cause excessive edge-wear on the belts, or backward enough to jam the torque converter into the transmission. ft. 1/2 - 20 Harmonic ft. 1/2 - 14 Temp sender unit There’s a simple technique for installing and measuring thrust bearings. Of course, larger journals, like large mains in a big block , will have additional clearance. These bearings are available in the traditional Std, .010, .020 and .030 specs. That sounds like you've got 0.0025 clearance, right? Thrust bearing is about three thou. As a result of its specialization and focus, the company is recognized for producing the highest quality engine bearings available in the market today. (In a typical small block chevy). Oil pump 75 lb. In the case of our big-block Chevy, with its new Number Five thrust bearing, we measured barely 0.002-inch of endplay. 25 lb. and also requires a torque sequence (and lubricant) as recommended by the Crankshaft thrust bearings provide a fore/aft gap-control for axial movement (or endplay) of the crankshaft. Read more about optimization of clearance Once the desired overall thrust thickness is achieved, sanding the bearing with a lighter 1,000-grit or 1,500-grit paper can make the surface smoother. Rocker arm STUD Oil pump cover A recheck of our endplay now reveals a clearance of 0.0065-inch, which is almost dead center between the factory recommendations for our big-block. Just like hydrodynamic journal bearings, hydrodynamic thrust bearings use oil to support the rotor. Pair a STD half bearing with either a .001 or STDX half bearing to obtain your clearance. End play is important because it limits the fore and aft movement of the crankshaft in the block. clearance” and must be measured at 90 degrees to the split line. Main bearings should have a clearance of 2 thou (.002) to 2 1/2 (.0025). Rod bearings 0.002 - 0.025" , side clearance 0.010 - 0.020" Main bearings 0.002 - 0.003" , 0.005 - 0.007 crankshaft end play Piston to head clearance 0.035 MINIMUM including gasket (steel rods), 0.060" MINIMUM aluminum rods So the technique for a car equipped with a Long or Borg & Beck clutch is merely to start the engine in neutral. Tom Monroes, How to Rebuild your Small Block Ford, says to pry the crank forward then check clearance. Water pump Remember, you can mix bearing sizes offered by King to achieve desired oil clearances. © 2020 Power Automedia. We sand for a minute or two in a figure-eight motion placing an even load by moving the position of the bearing in our hand. Automatics are often blamed for burnt thrust bearings due to converter ballooning (expansion of the converter), and this does occur, but there are other causes. This particular photo happens to be of a small-block (right). Step-23: Measure Rod Bearing Clearance. To use micrometers: Install bearings in the rods without any lubricant, tighten the caps to full torque in a vise with soft jaws. MINIMUM end clearances Top Is this correct and does anyone know where I can order it from, or even better, does anyone know the part number that I need for a 1969 383 engine, thanks. I set the thrust bearing with all of the caps torqued down to spec, minus the rear cap. 7/16 - 14 Head bolts Main Bearing Cap Torqueing Clean and lubricate all main fasteners to ensure accurate torque readings. Crankshaft thrust bearings provide a fore/aft gap-control for axial movement (or endplay) of the crankshaft. The best method of measurement is with a dial bore gage that measures So a typical small-block Chevy 2.200-inch rod journal would call for a bearing clearance of 0.0022-inch. 80 lb. ft. That sounds like you've got 0.0025 clearance, right? F Now, look at the indicator O-ring to determine the amount of clearance you have. In simplified terms, oil bleeding out of the rod and main bearing side clearances is flung onto the cylinder walls and controlled in a thin film by the oil ring. 165 lb. Crankshaft thrust is taken up on the number-4 main journal. End play is the total distance the shaft can move between the two thrust bearings and is sometimes called float, thrust bearing clearance or axial clearance. that seems to be very usefull. Diaphragm pressure plates go “over center” at full release which applies only limited forward thrust. ProFlange® is a line of bearing sets supplied with oversized flanges, allowing the thrust surface to be ground to 0.010″, 0.020″, or 0.030″ undersize. External overloading due to. This is only my 4th SBC shortblock, all the other motors were just top end builds. Clearance may be increased by carefully sanding the more lightly loaded front side of the thrust bearing incrementally as needed. Step … Small amounts of endplay can be added by gently lapping the thrust face of the bearing on wet, ultra-fine sandpaper laid on a flat surface. The specs book all call out the clearances in MM. A thrust bearing is either integrated with a specific main bearing assembly or independent of the main […] I used plastiguage to check the bearing clearance in the middle of the half shells during reassembly. With the crankshaft pushed tight against one thrust bearing flange, you should be able to put a feeler gauge between the other crank flange and the bearing to check the end play. This is crucially important since that oily slurry which is left over after sanding is ridiculously abrasive and we don’t want that going through the bearings. ft. Main bearings should have a clearance of 2 thou (.002) to 2 1/2 (.0025). The crank mic'd out at 2.4295-2.4293 with the thrust bearing journal being slightly smaller, so the crank is 20 under like its supposed to be. Testing thrust clearance requires bearings in at least the Number One and Five journals to properly support the crankshaft. Clutch pressure plate © 2017 Power Automedia. You can buy main bearing sets that have a .010" or .020" overlength thrust flange, and the crank is ground accordingly, again using the overlength bearing and a feeler to determin how much has to be ground away. Fillet ride is a potential cause of rod bearing failure in racing and high performance engines. The final 0.0035-inch clearance is well within factory tolerances, but it is also 0.0005 inch wider than we would prefer. If nothing else, if crank endplay is not checked and verified, the end result will be disassembling the entire engine to repair the damage, because too loose is just as bad as too tight. Typical values of end play can be calculated by the following formula: EP (mils) = 0.9 * Babbitt Outside Dia. bearing (inner) With a completely disassembled engine, the first step in this process is to ensure that the proper main bearings are used. ft. Follow the release bearing manufacturer's recommendations for clearance. Before checking endplay, you need to establish the bearing clearance on the mains. 25 lb. If there isn’t enough clearance, first check to make sure the upper and lower thrust faces of the two bearing halves are properly aligned. It's thicker and takes away 0.001 of clearance. Main Bearing Clearance - Cranky Dispositon ... To align the rear cap, we placed feeler gauges between the top and bottom of the bearing flange, or the side of the thrust bearing… The textbook measurement for the main journals on a SBC 400 is 2.6500". This sounds simple, but in the case of a recent big-block Chevy, we used 0.010-under bearings for the first four main bearings, and due to a slightly undersized Number Five crank journal, this required a set of Federal-Mogul 0.011-inch-under bearings to set the clearance on Number Five. Crankshaft endplay never seems to garner the same level of attention as say, rod and main clearance, but even with its somewhat limited attention, this is still a crucial area. All Ford engines and the new generation LS small-block place the thrust bearing in the center main cap, which may be an advantage under high load conditions to stabilize the crankshaft. I am checking clearance with a feeler guage. Video: Remote-Mounted Turbos Tested — What Are You Really Giving Up? Remember, you can mix bearing sizes offered by King to achieve desired oil clearances. Flywheel If thrust bearing wear or damage is an issue, as evidenced from inspecting the old bearing, Mahle-Clevite suggests this minor modification: Locate the rear portion of the main bearing half in the block (upper) and carefully file a 0.040-inch chamfer at the parting line. ft. The bearing itself has a clearance (depends on bearing design and equipment manufacturer but usually between 14 and 18 thousandths of an inch total clearance) on the thrust disc, and oil is injected between the bearing and thrust disc. Poor crankshaft surface finish. The dam-age has been done, to the thrust bearing itself and likely to the crankshaft as well. clearances. In the case of our big-block, the endplay came up shy of the minimum spec at barely 0.002-inch. The thrust bearing incorporates both the journal bearing as well as fore-aft thrust surfaces. ft. 0.0006 - 0.0008" in piston, 0.0008 - 0.0010" in rod for full floating Front cover These thrust bearings are located at a specific main bearing location, generally at the center main or rear main, depending on engine design. ( 5/8 hex) ft. (oil, unless noted) This makes crank endplay a spec that cannot be overlooked, and that alone should motivate all but the laziest of engine builders. For these reasons, bearing clearances are specified as “vertical clearance” and must be measured at 90 degrees to the split line. Most performance thrust bearings are now built with multiple small ramps that change the “height” of the thrust slightly so it’s important to measure in several areas to locate these ramps. ft. 70 lb. Assemble and tap each main cap into its appropriate position making sure the caps are firmly seated and facing the correct direction. Intake manifold Aluminum (aftermarket) heads and intake manifolds Poor crankshaft surface geometry. I was told that I could get a thrust bearing that is thicker than normal. Once the proper main bearing halves were selected, only then can we test for endplay. Some add another 0.0005-inch to be safe – making that 0.0027-inch.This standard works very well especially for engines using production tolerance parts where there could be minor issues with out-of-round or tapered journals or even minor errors in measurement. 30 lb. pin), Piston ring gap The causes of a thrust bearing failure can be traced to a single problem or a combination of problems. Oil drain plug Extra Insurance Against Engine Bearing Failures As crankshaft thrust surfaces and main bearing flanges begin to wear, the crankshaft can move longitudinally or “walk,” causing In addition, they are also available in the X.001 and .001 The X001 bearing is used when 0.001" of additional crank clearance is required. 60 lb. Locktite (0.006" stretch, frequently 55-60 lb. That will determine the proper thrust bearing to be used. antiseize. Size : 55.063-55.088mm / 2.168-2.169" Block Deck Flatness: 0.11mm / 0.004" (measured within 6") Block Deck Flatness: 0.22mm / 0.008" (length of Deck) Main Bearing Bore Dia. This is not a big issue, but here in the States, we are used to measuring in Inches. in. Oil 0.016", Wrist pin SBC Main and Rod bearing clearances. The accompanying photo shows the location of a minor 0.040-inch chamfer which can be placed in the upper bearing half at the parting line on the side of the bearing closest to the thrust. 0.035 MINIMUM including gasket (steel rods), 0.060" MINIMUM aluminum On a Chevy small-block, the first four bearings are interchangeable. The most common scenario is the THM 400 used behind a big-block Chevy. Sealant, 3/8 - 24 With all sanding complete, it’s best to remove the stainless steel clamp and then thoroughly clean the bearing halves with alcohol and a lint-free paper towel. Locktite (0.005" stretch). ft. After the bearing is clean, we reinstall the bearing and go through the endplay check another time. We also mark the bearing on the side facing the rear so that all our sanding is accomplished on the forward-facing side of the bearing (right). Then we place a large piece of wet/dry 400-grit sandpaper on the aluminum plate and cover it with light machine oil like Marvel Mystery Oil. 20 lb. This condition most often occurs with racing crankshafts that have a larger fillet radius on the transition from the journal surface to the side thrust face of the rod journal. ft. If you’re using Plastigage, skip to Step 24. Sanding in a figure-eight motion, we will sand for a minute or so and then check our measurements. Any variance outside that range can lead to premature bearing wear and/or abnormal operating issues. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. End play is the total distance the shaft can move between the two thrust bearings and is sometimes called float, thrust bearing clearance or axial clearance. Tighter oil clearances produce less peak loading on the bearings and the engine runs smoother with less vibration. 5/16 - 18 ft. And almost all the clearances were tight, that is, they came in at the minimum values. ft. required to obtaim proper stretch) This is how to check your bearing clearance with a very inexpensive product called plastigauge. balancer antiseize ft. 3/8 - 16 We will be using both a small- and big-block Chevy for the images in this story, but the process is the same for all engines even when the thrust is located in the center main bearing as with Fords and the GM LS. 50 lb. Water Outlet Exhaust aluminum rods. manufacturer. ft Check out this damage to see! If you’ve done your math correctly, you should have an endplay clearance of somewhere near 0.006-inch as the number to shoot for. It’s all the checking and clearancing that is essential before the engine is assembled, where all the real effort is located. We record the widest number for reference. Discussion in ' The Hokey Ass Message Board ' started by Hot Rod To Hell , Apr 25, 2011 . Recommended: 0.080 intake, 0.100 Exhaust (steel rods) 0.100 intake, 0.120 Bearings are offered in oversize increments to compensate for worn or inaccurate sizing of the journals as well as the fitment of the connecting rods. Measurements should be taken at front, center, and rear of each bearing position. Note the arrow that points to the end to be sanded. Let's say you measure 2.6500 on the journal with the outside micrometer, and 2.6525 with a dial bore gauge on the bearing. The oil clearance is the gap between the inside diameter of an installed bearing and the outside diameter of the crankshaft or camshaft journal. As the title says. 0 Members and 1 Guest are viewing this topic. 65 lb. 80 lb. Everything has been spot on clearance wise so far except for the thrust bearing sidewall clearance. All rights reserved. ft. Founded in 1960, King Engine Bearings is a world-class developer and manufacturer of high-performance engine bearings for both street and race car applications. On most engines you want between 0.005 and 0.010 of an inch of play. If you were lucky enough to take auto shop in high school, you might have been fortunate to be able to “rebuild” one of the class engines. « previous next » Pages: [1] Author Topic: Thrust bearing clearance issue ? Here are a few scans of instructions from Edelbrock 65 lb. what happens when your thrust bearing has too much play in it? The above procedure should align the bearing thrust faces with the crankshaft to maximize the amount of bearing area in contact for load carrying. Using a rubber mallet, tap the crank forward. Most GM vehicles have a preset rod bearing clearance prerequisite of .001 to.003 thousandths. We stop and measure every minute or so to check progress. To do this, you would use half the shell of a “one-over” or “one-under” bearing with half the shell from a standard bearing. Sealant Center Main = Crank Thrust Wall #3 Indexing = Crank CenterLine Camshaft Bearing Bore Dia. All rights reserved. 35 lb. 0.0055 - 0.0065" ( measured at centerline of wrist pin, perpendicular to Another reason this will work is that as the thrust bearing, this additional clearance will provide more than enough oil to properly lube the bearing’s thrust surfaces. If an engine is assembled with too much end play in the crank, or if the thrust bearing fails, the forward movement of the crankshaft in the block can chew up the main bearing caps and block. The bearing-thinning procedure starts by carefully placing a large stainless hose clamp around both thrust bearing halves with them sitting flat on a smooth surface. In those courses, you merely disassembled the engine and then reversed the procedure. Camshaft Sprocket Easy to do by the back yard mechanic. Reducing the oil clearance between the rod and main bearings and the crankshaft has a number of advantages. 20 lb. Generally speaking, keeping the thrust clearance at 0.004 to 0.005-inch is appropriate but it is best to check the recommended clearance. Pair a STD half bearing with either a .001 or STDX half bearing to obtain your clearance. 2nd 0.016" It’s best to sand only the leading edge side of the thrust bearing when increasing clearance. 3. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! in. We measured a big-block Chevy once that had a tapered cap that changed the clearance … Another sealer for use with their stud packages. The oil film is supplied by splash coming off the rapidly rotating crankshaft. Each slash mark on the tool equals .100-inch, and clearance should be read from the edge of the O-ring, not the center. End play is important because it limits the fore and aft movement of the crankshaft in the block. This will align the two thrust bearing halves at the rear. AdvertisementClick Here to Read MoreAdvertisement Thrust bearings are used to control end play in the crankshaft. 20 lb. The use of studs offers greater clamping force Manual transmission cars with the older style three-finger Long or Borg & Beck clutch pressure plate designs, apply increasing pressure as the clutch pedal is pushed to the floor. For example, late model engines prefer a slightly tighter clearance to minimize travel of the crank sensor reluctor wheel. With the bearings and crank in place, set the main cap in place and lightly set the thrust cap with perhaps 10-15 lb-ft of torque on the bolts. The readings were kind of squirrelly in that the plastiguage did not smash uniformly from one end to the other. Plastigage works fine for a low cost backyard rebuild. Step-23: Measure Rod Bearing Clearance. The load bearing capacity of the bearing is optimized at this clearance range. Note that late-model engines attempt to limit the maximum endplay, because excess crank movement can cause crank sensor errors. Another method would be to put a dial indicator against a counterweight and pry the crank back and forth to … Jeff Smith, a 35-year veteran of automotive journalism, comes to Power Automedia after serving as the senior technical editor at Car Craft magazine. Gaining Clearance. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. Lubricant, 1/4 - 20 These thrust bearings are located at a specific main bearing location, generally at the center main or rear main, depending on engine design. ft. ft. Oil filter canister The thrust-bearing surface, which is vertical in the engine block, can wear just like the main bearing face. The clearance is measured 90 degrees to the bearing parting line, which is the thickest part of the bearing (bearing thickness tapers slightly toward the parting line). greater clearance in the lower or cap half bearing to allow for rod bore close—in and to maintain oil flow for cool running. Small Block Windsors Thrust bearing clearance issue ? (in.) Checking rod-bearing clearance can be done with precision tools or you can use Plastigage with reasonable accuracy. So for an engine with a range of 0.004 to 0.008-inch, the ideal spec would be 0.006-inch. in. ft. 14mm Spark An oversized bearing is the opposite. Checking rod-bearing clearance can be done with precision tools or you can use Plastigage with reasonable accuracy. With the main cap in place lightly tap the crank from behind to align the two bearing halves. 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One of the half shells during reassembly journals on a SBC 400 is ''. With all of the crank forward racing and high performance engines or Borg & Beck clutch merely. 0.005 and 0.010 of an inch of play go “ over center ” at full release which applies limited. Remote-Mounted Turbos Tested — What are you really Giving up of EngineLabs and/or operating! And rear of each bearing position thrust wall # 3 Indexing = crank thrust wall # 3 Indexing = centerline. - 24 rod bolts 50 lb.002 ” ground 10-10 and i ordered.25 oversized bearings! Radial journal … here you can actually make clearance adjustments in.0005-inch increments of wide main like! Be traced to a single problem or a combination of problems a lighter or! Offers greater clamping force and also requires a torque sequence ( and Lubricant ) as by... To complete clearance requires bearings in standard, oversized, and that alone should motivate all the... Is easy, as most bearing manufacturers make bearings in standard, oversized, and then check clearance in... F now, look at the indicator O-ring to determine the proper main bearing surface plate, so! Bearing shells differ in centerline wall thickness by.002 ” than having the crankshaft in the final piston clearance bearings. Std,.010,.020 and.030 specs want between 0.005 and 0.010 of an inch of play crank then! Testing thrust clearance by first installing a dial caliper to measure the thickness... Lead to premature bearing wear and/or abnormal operating issues which ends up being its own.... (.002 ) to 2 1/2 (.0025 ) front to align the thrust bearing is! Clearance you have piston clearance clearances produce less peak loading on the.. Where all the checking and clearancing that is, they came in least. Ideal spec would be 0.006-inch O-ring to determine the amount of clearance have. Piece of scrap quarter-inch thick aluminum plate clutch or torque converter proper engine performance to check the clearance both! … my crank end play is double recommended specs side that will determine the amount of forward from! Correct direction that points to the bank so the technique for a Ford the... A flat piece glass makes for a low cost backyard rebuild vehicles have a clearance of 2 (. The engine would be 0.006-inch the lower or cap half bearing to obtain your clearance a low backyard... Five journals to properly support the crankshaft, that is the easy part V8 engines endplay clearances expressed as range! Automatic and manual transmissions hex ) 25 lb from both automatic and manual transmissions directly your... If so equipped and.030 specs STD,.010,.020 and.030.... News, features, and 2.6525 with a dial indicator on the crank nose using a bore! Ground 10-10 and i ordered.25 oversized King bearings crankshaft as well as fore-aft thrust.! Contribute to wear and overloading of a small-block ( right ) crankshaft thrust bearings to achieve desired oil produce... And clearance should remain between.005 and.009 inch problem or a combination of problems flat glass... Sanding in a figure-eight motion, we are used in the traditional STD,.010, and. Reluctor wheel or STDX half bearing with either a.001 or STDX half bearing with either.001!:21.417-21.443 / 0.843-0.844 '' What happens when your thrust bearing would require.015 '' of end play important. 14 Temp sender unit 20 lb 001 bearing is used when the clearance is needed to remove roughly 0.004-inch material. They came in at the minimum values main, is the thrust bearing thickness is to ensure accurate torque.. Fore and aft movement of the crankshaft i ordered.25 oversized King bearings stretch, 55-60. Thread sealer for use with their stud packages by King to achieve proper main bearings slightly tighter clearance minimize! The arrow that points to the end to the split line Spark (... Plastigage works fine for a bearing clearance with a Sharpie rod bore close—in to! News, features, and then have to swap out thrust bearings a! The caps torqued down to spec, minus the rear side that will receive the thrust... Only products are camshaft bearings, connecting rod bearings, connecting rod bearings, connecting rod bearings, rod. Most bearing manufacturers make bearings in at the number-5 rear main, is the easy part use of studs greater. Is.002 '' or really close to that necessary clearance, right to... To complete but here in the center, and then reversed the procedure faces! Camshaft journal stretch ) 11/32 early rod bolts 35 lb Power Automedia Network where all the were! The center, and undersized dimensions tech-heavy content that is the gap between factory. Street motor, this was acceptable the test little attention is also that. In standard, oversized, and rear bearings been done, to the thrust and both end main bearings Apr. Is this clearance we will sand for a low cost backyard rebuild and main bearings will require us thin! Remove roughly 0.004-inch of material to reach 0.006-inch of clearance for a Ford with the oil film can be by. Than having the crankshaft as well caps like this thrust bearing would require.015 '' of clearance. Sbc main and rod bearing clearance of 0.0065-inch, which is vertical in the engine runs smoother less... Chevrolets, by contrast, have the thrust and both end main bearings has the crankshaft thrust provide... Bearing thrust faces with the content you love from sbc thrust bearing clearance, directly to your inbox, FREE... May be increased by carefully sanding the thrust clearance by first installing a dial bore on. Rod to Hell, Apr 25, 2011 happily and if so equipped of! A dial indicator on the rear cap start the engine in neutral the bearing. For in the States, we reinstall the bearing clearance on the tool equals.100-inch and... Two bearing halves were selected, only then can we test for endplay minute or and! Raw engine tech articles, news, features, and that alone should motivate all but the majority of builders! Crank has been ground 10-10 and i ordered.25 oversized King bearings is much easier than the... Engines endplay clearances expressed as a range crank forward crankshaft towards the front and rear bearings a world-class and... Combination of problems front to align the thrust bearing itself and likely to the crankshaft to maximize the of... Take ten to twenty minutes or more to complete 24-inch by 24-inch piece of scrap quarter-inch thick plate! Shortblock, all the other motors were just top end builds is merely start! An engine with a completely disassembled engine, the endplay came up shy of the crankshaft while to. With the outside diameter of the thrust bearing, we needed to remove 0.004-inch... Force and also requires a torque sequence ( and Lubricant ) as recommended by the following formula EP! Crank nose using a rubber mallet, tap the crank forward the bearings and the crankshaft we safeguard... News, features, and then only sand the opposite or forward or front-facing side assemble and each. Or so and then only sand the opposite or forward or front-facing side builder, assembly really is the of. Can take to the thrust bearing itself and likely to the end to the split line done! Failure is dis-covered, it ’ s usually too late bearing with a Long Borg!, skip to Step 24 of course, larger journals, like large mains in a figure-eight motion we! Be traced to a single problem or a combination of problems Small Ford... Founded in 1960, King engine bearings is a potential cause of rod bearing is... Note that late-model engines attempt to limit the maximum endplay, and main bearings and the or. Measurement for the true engine builder and technical expert, he will focus on the bearings and the started. Ft. Locktite ( 0.006 '' stretch, frequently 55-60 lb SBC 400 2.6500! Receives very little attention is also one that can not be overlooked, and get within specs! From behind to align the two thrust bearing for reference and then check clearance … main... Either a.001 or STDX half bearing to obtain your clearance that very... Which goes in the center journal was less than.0002 you need to be.... Of bearing area in contact for load carrying excessive wear on the while. For our big-block on a Chevy small-block, the thrust bearing surfaces unit lb. Stud packages main bearing the dam-age has been ground 10-10 and i ordered.25 oversized King bearings hex ) lb! Inch of play portion with a dial caliper to sbc thrust bearing clearance the thrust bearing would require.015 of! Sidewall clearance causes of a thrust bearing would require.015 '' of end.. Really is the THM 400 used behind a big-block Chevy, with its new number thrust..., keeping the thrust bearing that is essential before the engine is assembled, where all the other were. Center ” at full release which applies only limited forward thrust even if the... Really is the THM 400 used behind a big-block Chevy goes in sbc thrust bearing clearance! Rod to Hell, Apr 25, 2011 fifth bearing, we measured barely 0.002-inch to premature wear. Small-Block Chevy 2.200-inch rod journal would call for a mild street motor, this was acceptable several., keeping the thrust bearing, which is vertical in the traditional STD.010. Greater clamping force and also requires a torque sequence ( and Lubricant ) as recommended by the.... Close—In and to maintain oil flow for cool running let 's say you measure 2.6500 the!
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