The truck can idle for 5 hours and just start getting heat to it, bobtailing it does not over heat but as soon as it gets hooked to a trailer I starts to overheat. Solution is to snake with a wire and dip in … Usually really weird overheat issues are head gaskets on the way out. Page 1 ... turbo64 Light Load Member. My concern is the overheating it's doing under a load. The number of hours that a marine engine runs is very dependent on the amount and quality of maintenance over the years. The engine isn't going to keep taking the abuse before his heads warp or worse. This may be the case if no other problems can be identified – if so after allowing the motor to cool it may be possible to continue at modest speed without further problems. The funnel helps push the coolant through with gravity. The point here is that air is trapped and it's already overheating under load. This is an infrared thermometer and it is what I consider to be an important tool for any boat owner. Either too much or too little load will shorten the engine’s life. For instance, diesels should turn at maximum-rated rpm under load without the governor kicking in and without belching smoke. Rupert Holmes has more than 70,000 miles of offshore cruising and racing experience, in waters ranging from the North Sea to the Southern Ocean and Cape Horn. Consequently, you may hear a pinging or rattling sound (spark knock) when accelerating, driving up a hill; or when the engine is lugging under a heavy load. Restricted fuel pickup tube or anti siphon valve Fuel System Test 4. If running the heater at max cools the temp at speed, it's air in the system. The water pump impeller on a marine diesel engine is easily damaged. Choosing a boat: which boat is right for me? If you don’t recall the last time you replaced the impeller for your engine or other accessories, consider adding this task to your list of chores, and don’t forget to keep spares in your tool box. I can restart the engine but it dies in a few minutes. If the diesel engine is not charging batteries the warning lamp will light, but with many engines the alarm buzzer will not sound. Although many people replace their marine thermostat with automotive replacements, in many cases they are subjecting their engine to conditions which will cause long term damage. At this point it's best to get all of the air out NOW and not wait for it to work itself out. Since this is an open forum, not all views expressed by its participants are shared by the owners and moderators of the forum. Most marine FWC thermostats open at 160°F and will be fully open at approximately 180°F. Get a long 10" thin funnel (Walmart auto) and put it in the tank with a rag or two around the neck to keep it in place and somewhat sealed in. 5 Common Causes of Low Diesel Engine RPMs Posted on October 7, 2010 December 14, ... problem is too large a prop. Propeller pitch or diameter, damaged blades 3. Test this by letting the engine warm up, then running the engine at full throttle while in neutral. Directly cooled units have raw water (the water the boat floats in) pumped around the engine. No doubt. As I always say “tools are free“.What I mean by this is the expense of the tool, and doing the job yourself, is almost always paid for by the labor savings.In 35 years of tool buying I have yet to find one that was not paid off in one or two projects or uses. Anyway, I determined shortly thereafter that the gasket had blown into the cylinder although no cooling fluid had escaped. We often get the question, ‘why is my 4.3L MPI MerCruiser overheating?’. Problems with your marine diesel engine at high revs. Diesel engine repairs: fuel, air, starting, wiring. Registration is free, and by doing so you get to post and participate in the discussion and view any attachments. Re: 454 overheats under load hi maclin , thanks for your interest and following my threads !!! Overheating in a marine diesel engine can be caused by a wide number of factors, but as with the diagnosis of all faults it’s important to check obvious and easily rectified causes before investigating more deeply. Diagnose and fix marine diesel engine problems at sea. Another time the right engine overheat ing alarm went off, figured out that the sensor was broken. boats.com is part of the Boats Group Network. In no particular order Engine Won't Reach Operating RPM. Marine engines utilize special thermostats specifically design to function in fresh water cooling systems. A new clean system under moderate load should operate at the lower end of this range and a dirty system under full load might operate in the upper range. Coolant Leaks are the primary cause of overheating in diesel engines and can be easily identified, as you will notice either a low coolant level or an excessive amount of bubbles in the coolant. Keep adding coolant through the funnel with your bleeder open until it's burped as much as possible. DaveDMCMW is spot on. … I promise this is your fix. Place the bucket under the engine exhaust port on the exterior of the boat. I have a 2006 international 9400i with a Cummins ISM. An Infrared Thermometer. He writes about all aspects of boat ownership and marine travel, including destinations, seamanship and maintenance, as well as undertaking regular new boat and gear tests. Last year I overheated one of them and blew a head gasket. The first is that a diesel engine needs to be properly sized in the first place. The engine isn't going to keep taking the abuse before his heads warp or worse. Check your diesel engine cooling water filter for debris. Also, make sure you have the necessary tools to solve the problem. Be aware that many factory coolant temperature gauges are inaccurate. Copyright © 1999-2021 Boats Group. Engine vibrates 1700 to 2000 rpm, stable lower and higher. As soon as they back off the load, then the temperature drops. So I hired a diesel shop to Inspect the Radiator Filler Cap: If the filler cap isn’t tightly closed it can lead to a drop in the internal … I got engines overheating 4 times, here is the story. The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. If this is your first visit, be sure to Overheating may occur when a marine diesel engine is run at high revs for an extended period, which puts systems under more strain than they normally encounter, exposing latent weaknesses. Related Articles. Heat Exchanger – Scale builds up in the heat exchanger. It is particularly a problem with 4×4 and light vehicle diesels. They can’t keep going out of loyalty or break down as an act of rebellion, but are essentially straightforward things that depend on a sequence of simple processes to keep going. In my mind, two conditions stand out. Test if in neutral aka “no load,” she can come up to speed. Make sure that you are checking your injections for clogs or leaks to keep everything running smoothly. I will attempt to bleed again from both ends. When under load for 20 minutes the rpm drops, a small amount of white smoke comes out of the exhaust and the engine dies. Also, as I haven't been burping with the coolant cap off, I will try that. Do-It-Yourself MerCruiser Repair Guides 4.3 MerCruiser Overheating (4.3L MPI Alpha and Bravo) 2001-2008 October 27, 2016 Repair Manual 0. Then (in a DeLorean) jack up the "rear" of the car as high as you can and start it. Re: Engine won't rev past 2000rpm under load List of possible causes of low WOT (Wide Open Throttle) rpm. If the engine is rated at 3,600 rpm with a wide-open throttle (WOT), then it should stop at 3,800 or so. Shut the engine off and gauge the amount of water in the bucket. Second check for flow into the bottle from the rear of the engine for blocked T. Now to bleed a pesky air pocket out of your car, this method works every time and uses a little science. Type and Octane possibly old fuel 2. The biggest problem associated with running too cool is excessive carbon buildup around valve guides and … Jul 25, 2014 0. Any temperature that reads outside of this range is abnormal and should be investigated. A surprisingly common and easily overlooked one is failing to open the cooling water seacock after working on the engine.It’s important to understand the elements of the cooling system on your boat – two different types are commonly fitted to marine diesel engines. The typical pattern is that their engines run hot under load (eg towing a trailer, going up a range, higher cruising speeds), rather than idling in traffic. If the voltage is less than 13V, the battery is probably not being charged. White smoke from a marine diesel engine is one of the most difficult symptoms to diagnose because a number of factors can point to two general causes: overcooling, whereby the cylinder head and combustion chambers operate at a temperature that’s too low for proper combustion; and piston-ring blowby, which indicates low compression and poor combustion. As the weight increases and the bottom becomes less than perfect, the engines end up working too hard. Any left after that will work it's way out. Testing The Knock (KS) Sensor The knock (KS) sensor can be tested by tapping on the engine near the sensor. Temp will go to 210 to 220. What is the advantage of removing it before bleeding? By that time he will have blown his head gaskets. Spark Plug Wires & Ignition: Spark plugs are what help your engine produce power in the first place. He also owns two yachts, one based in the Mediterranean and the other in the UK. That being said, I have done so many times in the past few days. Now onto the overheating engine. He currently sails around 5,000 miles per year and in the past couple of seasons has cruised from the UK to the Azores, as well as winning his class in the 2014 two-handed Round Britain and Ireland Race. How much it is shortened will depend on the degree of severity of the over or under sizing. This can be a result of engine components, such as the cylinder head, expanding due to excess heat. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions. Using a pressure tester just introduces more air and creates pockets between the engine rear and the heater core ( hence running the heat at full to cool the engine), DMCTalk F.A.Q. This will help the air in the system to rise to the highest point. Indirectly cooled engines are a more complex, with a closed cooling system somewhat like that of a car. 58 11. That problem is typically accompanied by expelling coolant from the cap. A little investigation & prevention can save you a lot of time and money. My VIN:    10757 1st place Concourse 1998, FRAMING JOHN DELOREAN - ON VOD boats.com, Cams Hall, Cams Hill, Fareham, Hampshire, PO16 8AB, UK. By that time he will have blown his head gaskets. - Frequently Asked Questions, The DeLorean Club of Ohio / DeLorean Motor City (DCO), The DeLorean Motor Club of New England (DMCNE), The Long Island / NY DeLorean Motor Club (LINY-DMC), The Northern California DeLorean Motor Club (NCDMC), The Pacific Northwest DeLorean Club (PNDC), The Southeastern DeLorean Owners Club (SEDOC), The Southern California DeLorean Club (SCDC), The Alberta DeLorean Owners Association (ADOA), Welcome to DMCTalk.org: an open forum dedicated to the discussion and debate about our beloved sports car the DeLorean, its maker, and anything interesting in-between. Check out the 10 ways you're killing your diesel engine with these easily avoided common mistakes. 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Have a 2006 international 9400i with a wire and dip in … that!

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