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Old 05-02-2006, 20:52   #1 (permalink)
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Stubborn Oil Pan or Rear Main Leak

I need some advice on possibilities for the cause of an oil leak (351c) I have replaced the oil pan seals 4-times and had the rear main replaced once. The leak is generally on the passenger side near the back bolt of the oil pan (it moves around an inch or so depending upon how much sealant I use). The leak occurred after I had the engine rebuilt (my install). It leaks about 10 drops/min. at idle & about 1/6 qt per hour at highway speeds. I'm fairly certain that it is not an oil pan gasket leak. On the oil pan seal replacements that I used alot of sealant ("The Right Stuff"), some of the leaking oil comes out from the transmission (Automatic) bell housing. After seeing this, I became convinced that it was the rear main seal. The engine rebuilders agreed and replaced the rear main seal (using less sealant with the pan). It still leaks! The engine rebuilders are wondering if it is the camshaft plug, but now none of the oil is coming out of the bell housing. I'm completely stumped (The oil pan is not warped). Any ideas?
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Old 05-02-2006, 23:02   #2 (permalink)
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Re: Stubborn Oil Pan or Rear Main Leak

I'd have the engine out in a heart beat to sort it. It's a better solution than loosing the engine to lack of oil.
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Old 05-03-2006, 20:08   #3 (permalink)
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Re: Stubborn Oil Pan or Rear Main Leak

Quote:
Originally Posted by hereinhelena
I need some advice on possibilities for the cause of an oil leak (351c) I have replaced the oil pan seals 4-times and had the rear main replaced once. The leak is generally on the passenger side near the back bolt of the oil pan (it moves around an inch or so depending upon how much sealant I use). The leak occurred after I had the engine rebuilt (my install). It leaks about 10 drops/min. at idle & about 1/6 qt per hour at highway speeds. I'm fairly certain that it is not an oil pan gasket leak. On the oil pan seal replacements that I used alot of sealant ("The Right Stuff"), some of the leaking oil comes out from the transmission (Automatic) bell housing. After seeing this, I became convinced that it was the rear main seal. The engine rebuilders agreed and replaced the rear main seal (using less sealant with the pan). It still leaks! The engine rebuilders are wondering if it is the camshaft plug, but now none of the oil is coming out of the bell housing. I'm completely stumped (The oil pan is not warped). Any ideas?
How are you installing the rear oil seal? Are you extending the bottom half out ~3/8ths inch on one side and the top half 3/8ths on the other side? If you are putting them flush with the parting line of the main cap, they will leak.


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Old 05-04-2006, 09:47   #4 (permalink)
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Re: Stubborn Oil Pan or Rear Main Leak

Did you remove the small pin from the rear main cap that is used to hold the old style rope seal rear crank seal in place? If it is not taken out when using the new type neoprene seal they will get punctured by the pin & will leak.
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Old 05-05-2006, 04:04   #5 (permalink)
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Re: Stubborn Oil Pan or Rear Main Leak

is there any plugs on the rear of the engine that are not tight or havnt had sealant on them , could be cam rear welsh plug ,i put in with sealant around them
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Old 05-06-2006, 02:33   #6 (permalink)
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Re: Stubborn Oil Pan or Rear Main Leak

Quote:
Originally Posted by pinkbits
is there any plugs on the rear of the engine that are not tight or havnt had sealant on them , could be cam rear welsh plug ,i put in with sealant around them
if its leaking that fast its under pressure i wouldnt be wasting time wif the pan gasket, i'm aware of 3 plugs at the back of the engine cam welsh plug and 2 allen key plugs either side but these would leak into the bell housing. its definately comin from the bottom? sure its not running from the oil pressure switch or back gasket on the intake valley? ur've prolly already checked just makin suggestions.
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Old 05-06-2006, 03:57   #7 (permalink)
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Re: Stubborn Oil Pan or Rear Main Leak

rear main seals will leak if the engine oil is overfull, I believe.
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