350 chevy oil leak in rear of engine - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-03-2003, 07:50 AM
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350 chevy oil leak in rear of engine

Hey gang,
I've got this 79 350 four bolt main thats leaking oil from the rear. I cleaned up the engine and it's definitely from the rear. I've tightened up the pan bolts (but not too tight) and it's still leaking. It looks like a ounce or 2. Also it looks like it's coming out of the hole in the trans insp cover(turbo 400). Is there any way to tell if it's the back of the pan gasket or the rear seal. I'm told the engine has about 25k on it since rebuild. Thanks!

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Old 09-03-2003, 08:27 AM
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Probably the rear seal BUT just double check the back of the valve cover gaskets to be sure they are not leaking first. If they are leaking out the back it will run down and appear to be a rear seal. If they are dry then sorry about your luck. The rear seal will have to be replaced. That is if you are sure it is oil and not tranny fluid. If you rebuilt the tranny and either installed the torque converter dry or nicked the seal then it could be the front seal of the tranny leaking. Just make sure what fluid you are contending with before you do anything.

Good luck,
Kevin
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Old 09-03-2003, 08:31 AM
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Like Keven says it`s probably the rear seal, but check everything first.

Troy
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Old 09-03-2003, 08:43 AM
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Thanks for the help. Yes it is oil and not trans fluid and after degreasing the engine it looks like the valve covers are not leaking. Thanks for the quick replies.
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Old 09-03-2003, 09:15 AM
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Check this!!!

Check around the dist for oil leak. I think your gonna have to pull the trans and replace the rear main seal, but it`s not that big a job!!!
Let us know how it turns out will ya? Have a real good day today!!
Slider in Wa.
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Old 09-03-2003, 09:49 AM
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I't didn't look like it was coming from the dist. but I will look again. I've read a few posts about replacing the rear main seal by pulling the oil pan and the bearing cap and then sliding the old seal out and the new one in. Will this work on this engine? Also if it will work, should I lightly loosen the other main caps when replacing the seal? What should I retorque the bearing caps to?
Thanks!
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Old 09-03-2003, 09:58 AM
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Check the knowledge base on this site!!!

If it is a split seal (rear main) you can do it , but very tough!!!
Better to spend the 30 minutes and drop the tranny out. Get good access to the seal. Pull the toqure converter. Drop the pan down, not out. (although, if it were me i would replace the pan gasket at the same time.) If the engine had a lot of miles on it i would replace the oil pump while i was in there. It`s not that tough a job really. and better to do it right than having to do it again.Knowledge base on this site should have something on this, including toqure values.
Two penny`s worth from me.
let us know!!!
Slider in Wa.
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Old 09-03-2003, 10:19 AM
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Thanks slider, will keep you all updated.
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Old 09-03-2003, 11:27 AM
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not sure, but!!!

Perty sure your rear main seal is a one peice. Have a good day!!
Slider in Wa.
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Old 09-03-2003, 03:48 PM
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The distributor was already mentioned, but it could also be the oil pressure port near the distributor or the cam plug. I'd save some labor and check those topside locations first.
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Old 09-03-2003, 11:23 PM
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I've had a few rear main seals leak over the years. Never changed them, just added more oil!
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Old 09-04-2003, 07:49 AM
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Sandflea, I like your suggestion the best. I'm just getting tired of the oil drips in the driveway.
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