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Old 11-09-2005, 11:57 AM
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Oil lost through rear seal?

The oil level in my 383 keeps going down since the rebuilt time..about a quart for 600 miles.

I've discussed here many different possibilities explaining this without being able to conclude to nothing sure yet.

Everytime I'll come back from a ride I noticed a drop of oil present at the bellhousing lower part.I kind of made sure this is not from anything leaking higher on the engine like leaking valve covers,distributor base,intake manifold,oil sender hole etc..the block is dry and clean. So I can think about the oil pan gasket rear portion or crank rear main seal wich is a two part one (old 1970) block.I can't reach under the car and inspect it good now but lets we supposed it is one of these. Now when parked after a run it will be really only a few drops then it looks like once cooled it stops.

My question is how much oil could actually seeps through the seal or gasket while the car is actually underway? Is it likely to leak much more underway than parked? The undercar area is clean not having traces of oil sprayed around..if leaking that much from there could it not leave any traces on the undercar...Well I guess its not an easy one to answer but who knows maybe somebody here could have seen similar situation..mind you I think I'll have to proceed to a leak down testing soon!

thanks,Ronald.

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Old 11-09-2005, 01:09 PM
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Oil pan gasket, rear main seal, can bearing tunnel plug, oil gallery plugs near the cam rear plug. Or a crack?
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