rear main leak
#2332130
07/05/17 08:17 PM
07/05/17 08:17 PM
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Joined: Mar 2008
Posts: 109 WASHINGTON
superbee471
OP
member
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OP
member
Joined: Mar 2008
Posts: 109
WASHINGTON
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I have a recuring rear main leak and can not seem to get it fixed. i just pulled the engine (400 block with eddy heads ) took it apart put new bearings in it a new ultra seal, ( the one that looks like a rope seal) billet alum. rear main seal retainer. all new gaskets. shined up the rear main seal area (68 383 steel crank, with the serrations ) put it back together . stuffed it back in the car , run it in for 20 plus mins like a new engine, (no leaks ) took it for a drive, about 20 miles. on the way back, the new seal started leaking again, real bad. pulled it in shop and shut it off, 10 inch oil puddle. I am at a complete loss. I am not a professional , but i have built 25 big block mopars over the years, and this is the first one ever to have this problem. This engine holds about 70 pounds of oil pressure at speed after warm up. drops down to 40 at idle. any thoughts, i know i got to pull it again, and tear it down , would like for this to be last time, want to drive this car (70 superbee, 4 speed ). any help would be appreciated.
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Re: rear main leak
[Re: superbee471]
#2332162
07/05/17 09:43 PM
07/05/17 09:43 PM
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Joined: Jan 2003
Posts: 4,278 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,278
Morrow, OH
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Not uncommon. We recently went through this on JCastle's RR with a 505. Think he had it apart 3 or 4 times finally the last time it was good.
Search for previous posts on this subject. Several good, long discussions.
His did not leak too bad right away either.
But a couple of points:
Make sure that you are not building pressure inside the motor - make sure you have adequate breathers. Don't overlook this.
In the back of the seal retainer (by the flywheel or TC) make sure you clean that area and fill it with RTV.
On the RR it was not hard to pull the pan and get to the seal with the motor in the car. We fortunately were able to work on it on a lift.
And good luck.........
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: rear main leak
[Re: superbee471]
#2332222
07/05/17 11:40 PM
07/05/17 11:40 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'm assuming it is the seal/retainer & not the pan flange. yes find those prior threads
live every 24 hour block of time like it's your last day on earth
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Re: rear main leak
[Re: superbee471]
#2332635
07/06/17 05:23 PM
07/06/17 05:23 PM
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Joined: Jan 2003
Posts: 4,278 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,278
Morrow, OH
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I will have to pull the engine there is no way to get to the ultra seal or remove it without pulling the crank. Maybe I don't know what an ultra seal is, but you can pull the big block seals in and out all day long without pulling the crank........ Just ask J Castle!
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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