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Re: Rear main STILL leaking!
[Re: CompWedgeEngines]
#1050409
08/13/11 08:18 PM
08/13/11 08:18 PM
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Joined: Jan 2006
Posts: 587
IL . usa
cjs69mope
mopar
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mopar
Joined: Jan 2006
Posts: 587
IL . usa
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Quote:
You dont make the bores any bigger than the required specs, which have a low and high limit. The reason the bores arent " expanded" is because tyhe first thing you do is cut a few thousands of an inch off the feet of the main caps. The makes the bore " smaller" to start with, then you bore or hone ( two completely different things) back to the spec size. I prefer to hone to the low limit, which gives the maximum " crush" on the bearing shells. The bearings shells ( outer) dont change, they are all the same size. If a shop does the job RIGHT, they take minimal material off of the block sides ( saddles if you will)of the mains, so as to not change the crank to cam centerline very much. If someone doesnt do it this way, they then change that dimension, and if its been done several times wrong, thats where your " minus" timing chains come into play.
I agree with this , if the line bore is properly done the block dimensions should not have changed , material should be taken of the caps first .
they sell a special main bearing with a slit in it to dump oil pressure away from the seal in the block this may help .
jc whittney used to sell the speacial main bearing.
1969 Dodge Charger
1969 Dodge Superbee
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Re: Rear main STILL leaking!
[Re: Ledman_70]
#1050410
08/14/11 03:23 AM
08/14/11 03:23 AM
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Joined: Mar 2007
Posts: 3,278
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,278
West Coast, USA
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Quote:
The seal is rubber and the crank is smooth. I never even thought to check the back of the motor last summer when I installed a new clutch.
Maybe you could tell us how you are installing it. What sealant you use, where you are putting that, etc. If you explain the entire process/technique you are using, it may uncover a skipped step or other problem.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Rear main STILL leaking!
[Re: Ledman_70]
#1050412
08/14/11 10:29 AM
08/14/11 10:29 AM
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Joined: Jan 2003
Posts: 75,017
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,017
U.S.S.A.
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Quote:
The seal is rubber and the crank is smooth.
You say you have a stock crank from a 413 and it's seal surface is smooth ???
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Re: Rear main STILL leaking!
[Re: WyleECoyote]
#1050414
08/14/11 05:07 PM
08/14/11 05:07 PM
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Joined: Jul 2008
Posts: 30,431
Florida STAYcation
BeEtLeJuIcE !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
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Quote:
I made my own transmission dust cover with no relief, sealed it with permatex, tapped the bottom of the bellhousing and installed a drain plug. I empty it every couple of months.... ACME APPROVED.
ACME approved ? .... now Mr Coyote wouldn't the RoadRunner just plumb-it back into the pan ?
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Re: Rear main STILL leaking!
[Re: Oyvind Mopar]
#1050415
08/14/11 05:10 PM
08/14/11 05:10 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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I've correct two engines recently that had received multiple new rear main seals... Both were leaking out of the oil galley plugs.... The plugs were not tapered plugs like the factory plugs, the engines had both been recently (within 5 years) overhauled & both had galley plugs that were not like OE....  BTW You can pull the trans & pull the distributor & oil pump drive & have someone spin the oil pump while you check the galley plugs...
Last edited by 1_WILD_RT; 08/14/11 05:12 PM.
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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