Feb 26, 2013 #1 what would cause the thrust bearing to go out. 11/13 To align the rear cap, we placed feeler gauges between the top and bottom of the bearing … I have seen cases of thust bearing failure on small block Ford engines that do not seem have an apparant cause. small block thrust bearing failure i have an 86 chev 3/4 ton 4x4 350 motor th400 trans. I got a plastigage set and I am going to check all of the clearances tomorrow. a few months ago i had my engine completely rebuilt installed the motor broke it in and within a week had a failure of the thrust bearing. Dirt 44.9% Misassembly 13.4%. Since I'm running an automatic, I'm looking for what to check or potentiall replace. If it isn't, you'll need to take out the rear thrust bearing and repeat the sanding. « previous next » Pages: [1] Author Topic: what caused thrust bearing failure (Read 15563 times) vroomzoomboom. Location: Canada NOS is nice, but i'd rather be BLOWN! I've found common and not so common failures to be: 1. Thrust Bearing Failure. Because this bearing rides on a thin film of oil between it and shaft, it is crucial that the bearing doesn’t come in contact with the shaft. 2stroke Offline Posts: 7. I have been reading that 0.0025 seems to be pretty standard for a performance SBC on both rods and mains? my engine builder told me it was due to a faulty transmission or torque convertor. The most likely cause is the transmission. BEARING FAILURE. 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. The thrust bearing is located nearest the compressor wheel. This can quickly wipe out the thrust bearing. 350 thrust bearing failure? I then realized that the main bearings the engine was assembled with were 0.0006 undersized, and the main thrust bearing was 0.001 undersized. Covered here, are the most common failure types. 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 When a thrust bearing failure is dis-covered, it’s usually too late. Its job is to limit end play (and we’ll note that typical end play should be between 0.002 to 0.004 inches). Naturally, improper assembly—se-lecting the wrong thrust bearing thick- The nominal crankshaft thrust spec on a Ford small-block is 0.0040.008 inch, with 0.004 inch considered ideal. Major causes of bearing failure Normal Appearance Uniform wear pattern over approximately 2/3 of the bearing’s surface. The causes of a thrust bearing failure can be traced to a single problem or a combination of problems. Please refer to the Bearing Distress Guide located at www.mahle-aftermarket.com as a reference to help you in properly determining the cause of premature bearing failures. Overloading 9.5% Corrosion 4.2%. Grass Roots Small Block Windsor what caused thrust bearing failure : 0 Members and 1 Guest are viewing this topic. The dam-age has been done, to the thrust bearing itself and likely to the crankshaft as well. Misalignment 12.7% Insufficient Lubrication 10.8%. Other 4.5% Thus we can reason that if a mechanic merely replaces a damaged bearing in an automotive engine, without determining the cause of its failure, more than 99% of the time he will be 5. Thread starter gwhiz; Start date ... Aug 21, 2012 184 0. Engines with a center thrust bearing usually, as well as rubbing the thrust surface, will show signs of wear on the opposite sides of the crankshaft on the two intermediate bearings. Most failures seem to be forward pressure (something is pushing the crank toward the front of vehicle). Inch considered ideal inch considered ideal pretty standard for a performance SBC on both rods mains! The front of vehicle ) with 0.004 inch considered ideal location: Canada NOS is,. 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