How to tell: Rear Main or Oil Pan Gasket Leak? - Ford Mustang Forums : Corral.net Mustang Forum
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Old 07-15-2006, 03:02 PM   #1
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How to tell: Rear Main or Oil Pan Gasket Leak?

Have had an oil leak coming from what looked like the rear main seal...I was trying to use the factory PCV system which didnt work out...I have since gone with an open breather in each valve cover...
Pulled the transmission last night..oil is saturated all over the back of the block.. I cant tell if its the rear main seal or oil pan gaskets leaking..If it is the rear main wouldnt it leak down onto the oil pan rail and cause what looks like an oil pan leak?... whatever it is, is pretty bad----would blow oil all over the starter and oxy sensors... car would smoke when stopped from buring oil on the exhaust.
any tell-tale way of finding which it is? I'm using a Caton pan with the gold oil pan bolts it came with... had the engine builder assemble it all.
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Old 07-15-2006, 03:05 PM   #2
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If oil is all over the back of the block, it may becoming from the back of the lower intake to block area. Common area to leak from. If it is either a RMS or oil pan leak, it shouldn't be on the block. Other possible place is your valve covers - not too many other places it can leak from.
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Old 07-15-2006, 09:26 PM   #3
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the tranny is out..it is not the valve covers or lower intake, both of those areas are clean and dry.
...its dripping down from the rear main or oil pan gasket... its been soaking the flexplate and then slinging all over the back of the block, starter and exhaust...
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Old 07-16-2006, 06:34 PM   #4
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do u have the spacer between the engine and transmission in ? its like a 1/4 inch thick steal plate. if u did and there is oil on the back of the flywheel its from the rear main seal. Also those canton pans are nortorious for leaks.
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Old 07-16-2006, 06:58 PM   #5
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Quote:
Originally Posted by 97305hpcobra
do u have the spacer between the engine and transmission in ? its like a 1/4 inch thick steal plate. if u did and there is oil on the back of the flywheel its from the rear main seal. Also those canton pans are nortorious for leaks.
With what he said thats how I know that my oil pan gasket is leaking

I read somewhere that your not supposed to use an oil pan gasket (Just silicone) if you have a pan that has been welded together.

No matter what you should replace the rear main seal, because you dont want to take the trans back out. Learn from others (me) mistakes.
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Old 07-16-2006, 11:17 PM   #6
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I do use a block plate....there was more oil on the block plate then the flexplate its self... all the oil on the back of block was situated around the rear main seal and just below the corners of the oil pan.....when the engine was running, oil would leak onto the flexplate and torque converter and they would sling the oil on the inside of the bellhousing, the starter, k-member and exhaust.....it was a pretty bad leak..
I am def. replacing the rear main seal but dont know whether to do anything about the oil pan gasket....other than dropping the k-member or pulling the entire motor,...with the trans. being out of the car, dont know how else to do it..... anyone had any luck replacing an oil pan with a tubular k-member while still in the car?
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