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Message: [QUOTE="Garbage_Mechanic, post: 926659, member: 1610"] [b]LEAK FINDING TECHNIQUE[/b] Over the past 35 years working on diesels I have developed a failsafe way to find these kind of leaks. Here is what I do: Using shop air regulated to less than 5 psi, couple an air hose to the crancase vent (CCV hose). With the oil filler cap off and dipstick in tight add air pressure to the crankcase until you can just feel it want to blow your hand off of the fill hole. Put the filler cap back on and proceed to look for leaks with soapy water. I have done this multiple times, even experimented with hom much pressure is too much. The dipstick blew out before anything else went wrong. For instance, I had a small leak inside the bellhousing I couldn't find. After trying everything else, I found the top corners of the rear main seal plate were leaking. This is like 10" above the level of the oil, but after extended high speed running it would leak about 4 drops. I would never found it without compressed air. I also found a dipstick adaptor that refused to be fixed, there was a groove in the dipstick hole where the o ring was supposed to seat. And I had a pesky leak I thought was the front crank seal, but turned out to be the pan to front cover silicone joint, which I fixed with IH grey sealant. Worth trying at least. [/QUOTE]

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