|
Re: SB Mopar Rear Main oil leak
[Re: Taconite]
#133356
10/07/08 10:22 AM
10/07/08 10:22 AM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
The first thought that comes to my mind is a nick or scratch on the seal surface of the crank. Any oil that would leak between the pump/main cap surface should just spill back into the pan.
Did you use a small dab of RTV at the seal ends when you reinstalled the main cap?
Sid
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: Taconite]
#133358
10/07/08 11:03 AM
10/07/08 11:03 AM
|
Joined: Jan 2003
Posts: 11,711
Portage,michigan
B3422W5
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 11,711
Portage,michigan
|
Quote:
I have been having issues with an oil leak since I had my motor built a several years ago. My motor a SB 340 seems to be leaking out of the rear main area. I have replaced the rear main seal 3 times. I know that this is being installed properly and the correct direction. I called the engine builder and they said to try a 455 Buick rope seal which I tried with no success either.
I pulled the motor out again and pulled off the rear main cap and I was thinking that the oil might be coming out of the mating surfaces between the oil pump and the block. Has anyone every seen this before? Any one have any ideas of how to fix this? Thanks for any ideas in advance.
I had what i thought was a rear main leak a few years ago..pulled pan off with motor in car, rplaced seal, still leaked, pulled pan off again, rope seal, still leaked.
Finally took car and got it on a lift, pulled tranny out, the big cam plug was leaking, replaced and that was it, could see a little oil just standng in the bottom of the plug. it would run down the back of the block and look exactly like a rear main...just a thought
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: Taconite]
#133360
10/07/08 04:58 PM
10/07/08 04:58 PM
|
Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,586
Tampa, FL
|
I just went through this horror show.... I had to remove the headers and motor mounts and hoist the engine up as high as it could go to get enough clearance to get the pan out..... I had a pretty bad leak and I used a gasket kit for a late model magnum engine and I have a 70 318 block.
I replaced the rear main seal with the correct seal with the "ears" and it seems to be doing alot better but I did notice some oil leaking from the right angle oil filter adapter. I am going to get rid of it hope that solves all my oil leaks.... here is a pic of the 2 different seals...
TBF
71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: tpabayflyer]
#133361
10/07/08 05:01 PM
10/07/08 05:01 PM
|
Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,586
Tampa, FL
|
block side view..... I have an 83 J-body... TBF
71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: tpabayflyer]
#133362
10/07/08 05:07 PM
10/07/08 05:07 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
offset your rear main by about 1/4" in the slot. to do that, you'll cut those ears off the car seal. cut them flush to the back of the seal. You still use those ears and just butt them up against the rear main seal sticking up. still use RTV on the ends of the seal and a layer on the cap mating surface where the ears are.
I had a leak as well, thought it was the rear main- found out the oil pan gasket had split. the rear main sealed great
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: Taconite]
#133367
10/08/08 02:39 PM
10/08/08 02:39 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
but do you have a pvc on the other valve cover?
|
|
|
Re: SB Mopar Rear Main oil leak
#133368
10/08/08 02:52 PM
10/08/08 02:52 PM
|
Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
|
master
Joined: Jan 2003
Posts: 9,826
las vegas
|
excessive crankcase pressure is more likely to blow the oil pass the rear pan seal and not the rear main seal... the rear main seal will be under pressure from the oil pump...
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: 70AARcuda]
#133369
10/08/08 03:07 PM
10/08/08 03:07 PM
|
Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
|
I Live Here
Joined: May 2003
Posts: 15,487
Florida
|
that part of the crank can be worn and a seal no longer can seal on it also like rod bearings..std,.010,.020 over size put a mic on the crank and see if its still in specs and lube the seal with oil so its not a dry start,and burn the rubber 
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: scratchnfotraction]
#133370
10/08/08 07:27 PM
10/08/08 07:27 PM
|
Joined: Feb 2003
Posts: 515
Dayton, Ohio
65cuda
mopar addict
|
mopar addict
Joined: Feb 2003
Posts: 515
Dayton, Ohio
|
i just tonight found that problem. the Mr. gasket kit doesn't have the seal with the ears molded on like the felpro. they just include the two pieces. mine was lealing like he** too. so i was looking at some pieces i had left in a felpro kit. and there was the seal with the ears molded on. i will be getting a new pan tomporrow. i bet that was the leak. doesn't look like u have the seal with the ears as in the above pic. 360s don't use that both seals are the same. no more Mr. gasket stuff for me.
65 Cuda 360,3.23 SG-13.97 @99.4, 88 D100, 2000 Kota Qcab, 71 Duster 416 11.84 @110., 73 Imp ,(2)72 & (1)71 Dart Swingers
GarysMocars Legendary Dealer
|
|
|
Re: SB Mopar Rear Main oil leak
[Re: tpabayflyer]
#133371
08/01/10 06:49 PM
08/01/10 06:49 PM
|
Joined: Oct 2006
Posts: 387
Montreal PQ, Canada
74_360_Cuda
enthusiast
|
enthusiast
Joined: Oct 2006
Posts: 387
Montreal PQ, Canada
|
Quote:
I just went through this horror show.... I had to remove the headers and motor mounts and hoist the engine up as high as it could go to get enough clearance to get the pan out..... I had a pretty bad leak and I used a gasket kit for a late model magnum engine and I have a 70 318 block.
I replaced the rear main seal with the correct seal with the "ears" and it seems to be doing alot better but I did notice some oil leaking from the right angle oil filter adapter. I am going to get rid of it hope that solves all my oil leaks.... here is a pic of the 2 different seals...
TBF
I am going to install the magnum seal (4798216AC) as recommended in Larry Shepard's book (how to hot rod mopar small block). It is the same as in your picture but I beleive you had it installed in the wrong orientation. The small lip should be facing FWD so that oil pressure push it against the crank. Also there is marks on the seal in a specific direction to push the oil back... My problem is i cannot find my book anymore... could someone confirm that to me? Thanks,
|
|
|
|
|
![4737481-engine_006[1].JPG](/ubbthreads/ubbthreads.php/ubb/download/Number/16463/filename/4737481-engine_006[1].JPG){kind=link}
![4737482-engine_008[1].JPG](/ubbthreads/ubbthreads.php/ubb/download/Number/16464/filename/4737482-engine_008[1].JPG){kind=link}