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Old 04-20-18, 08:02AM   #1
Mr.Pontiac
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Default where can oil leak be coming from???

Recantly a nice guy i know has been fighting a high RPM oil leak that has me and also him baffled. Motor oil is covering his tranny pan and side of drivers side tranny area. Car is a 72 with 400 motor headers all the goodies. Motor running, never a drop on the floor. He has had tranny out twice no issues with rear plugs in block. But after a 13.00 run oil is everyplace. I checked valve covers completely dry around heads. Nothing around valley pan area. This one got me??? any ideas???
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Old 04-20-18, 12:46PM   #2
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Oil galley plugs in back of block, rear cam plug, rear main seal.
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Old 04-20-18, 01:42PM   #3
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Quote:
Originally Posted by Mb125 View Post
Oil galley plugs in back of block, rear cam plug, rear main seal.
Iíd agree if it happening makeing a run, itís most likely happening when oil pesure is up there. Why itís not slowing up just sitting. Can be a tuff one to fine

Think I would eliminate by replacing cam and oil plugs in back of the motor and use some Permatex sealer on them when you put the new ones in. Same goes for the screw in plugs for oil galley. Kind of Process of elimination.
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Old 04-20-18, 05:13PM   #4
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While he had tranny out for some maintanance, I looked and rear plugs and cam bearing plug. Bone dry. It very well can be blowing out rear main seal, He and i are using the teflon seals. Followed the directions to the t. But you just never know.
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Old 04-20-18, 06:44PM   #5
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Just saying if itís real seal, it usually drips after car been setting. If it hasnít itís a pressure point. Lots of times they put those plugs in with no sealer. Oil plugs that are like freeze plugs and they leak under pressure only. Just saying it doesnít hurt to redue them, process of elimination.

Or another simple thing, oil filter gasket doesnít seal good under pressure and only sprays out under load, just some things I found along the road of many years.
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Old 04-20-18, 07:40PM   #6
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oh, ya, oil filter not sealing under pressure, hummmmm, maybe, come to think of it there was a few drops of oil on the filter. Ill let him know. suggestions to illiminate if its the problem??? sealer around ring?????
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Old 04-20-18, 10:00PM   #7
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No, I always put a little oil around the rubber seal, which kind of allow it to be tighter when you initially install it. Usually get and extra 1/4 turn.

I marked it once and put it in dry, then put oil on rubber seal and it took extra 1/4 - 1/2 turn.

Old time mechanic told me that. I had one leak once drove me crazy until I found it.
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Old 04-21-18, 02:18PM   #8
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Had a hard to find leak like that and it turned out to be the pipe plug near the distributor. When the car is moving the oil gets blown down the back of the block and itís hard to see where itís coming from.
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Old 04-21-18, 02:27PM   #9
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Default Thanks Tom

Trans is in, but ill mention it to him.
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Old 04-21-18, 05:52PM   #10
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Not the plugs at the rear face of the block,the one on the flat pad on the top where the distributor goes in. Visible with the trans bolted up. See if thereís any oil near the distributor base.
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Old 04-21-18, 06:14PM   #11
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Bill & i both are monoriting our oil pressure at that spot. We both have a fitting and a reducer to our oil pressure line . Hay ill take a look
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Old 04-22-18, 02:05AM   #12
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Did you check the oil pand bolts..They tend to loosen
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Old 04-22-18, 02:52AM   #13
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Yup check the pan gasket and bolts especially at the back.
Any severe oil slosh on hard acceleration and that area can leak if not totally sealed .
You guys using stock pans?
Couple that with crankcase pressure at high revs and oil will push out.
Just putting around or at idle its gonna look OK.


Rear main seal leak would make a mess inside the bell housing & on the flex plate/flywheel ,there would be oil in the dust cover for the torque convertor .
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Old 04-22-18, 02:36PM   #14
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checked pan bolts first thing, there ok. No oil on flexplate at all or around dust cover area. Trans pan usually gets covered. Thinking blowing back from someplace. Thank You for your input.
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Old 05-02-18, 03:08PM   #15
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Valley pan bolts or the rear of the valley pan.
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