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Blown head gasket on MF 65

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Phil N

06-20-2001 08:10:44




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A couple of weeks ago I got my MF 65 diesel in some deep mud and struggled to drive out. There was a lot of black smoke and immediately afterward I noticed that the head gasket had blown. My mechanic replaced the gasket and last weekend I managed to get it into the same mudhole, same story, and the head gasket had blown again. My question is - does a sudden heavy strain on the engine cause such internal pressure that the head gasket can blow or is this not related? Thanks

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ralph

06-20-2001 15:22:51




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 Re: Blown head gasket on MF 65 in reply to Phil N, 06-20-2001 08:10:44  
Do you still have the first gasket that failed? The point of failure on the first failed gasket would direct you to the area where the problem is. Head gasket usually do not fail suddenly unless there is a problem that the mechanic over looked. I have seen head bolts that caused a sudden failure. The bolts do not torque correctly because of damaged threads or the the threads are damaged in the block. A small crack in the top portion of a liner will cause a sudden failure. A cracked head will cause a failure, but the coolant system will let you know because of combustion gases entering the coolant system.
You mention black smoke. What was the full throttle RPM when the gasket failed? Did the engine RPM drop fast when under a heavy load? Did the engine stall out? There is a limit on the amount of fuel that will be sent to the injectors when under a heavy load. The governor determines the amount of fuel sent to the injectors unless you have a bad injector and unburnt fuel gathers in the cylinder. On compression stroke, this fuel puts a strain on the head gasket and causes a failure. Did the gasket fail between cylinders? This will be the weakness area, the area with the most stain. The failed gasket will indicate that. That would be the area to start looking. When you determine the area of failure, try to determine what would cause the type of failure you find. Compare the two failed gaskets. Determine if both failed at the same area. The two failed gaskets will give you the best answers.
Good luck ! Ralph

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