Gotta new leak

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
Prior to replacing oil pan gasket very minimal leaking from that area. Replaced it started leaking at the back of the pan where the long bolts pass thru. Put it in with no rtv. Replaced the gasket used rtv still leaking at the same place. It seems to be a pretty decent little leak defiantly compared to the way it was. Seems to be leaking and coming down and running down the fin and dripping off the drain bolt. Picture is after cleaning it but that’s the area. Since it started after replacing it I’m ruling out rear main seal. IMG_8567.jpeg
 

kris812

Well-known member
Jun 11, 2014
267
93
Tucson AZ
From what I can see in the picture, that bolt is too long and doesn't have threads on it but the last 1/2". It looks bottomed out against the pan?

Also looks like bolt on other side is the same and leaking as well.

If it's anything like some T case bolts, the bolts themselves need sealant on them.
 

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
Those 2 are the longer bolts for the oil pan they are in the correct place. I don’t think they seal anything since the gasket is on top. It’s just flat. It’s just a flat surface.
 

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boxster

Well-known member
Jun 1, 2009
479
96
Fallbrook Ca.
Is the pan gasket set in place correctly? Maybe aluminum pan is warped or has a crack or porosity which produces the leak.
 

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
Is the pan gasket set in place correctly? Maybe aluminum pan is warped or has a crack or porosity which produces the leak.
I think the pan is good an I think the gasket is good. Guessing since its leaking from the same area and 2 different gaskets one with RTV and one with Out that I'm looking at something else.
Maybe the Crucifix?
 

boxster

Well-known member
Jun 1, 2009
479
96
Fallbrook Ca.
I think the pan is good an I think the gasket is good. Guessing since its leaking from the same area and 2 different gaskets one with RTV and one with Out that I'm looking at something else.
Maybe the Crucifix?
Re clean the area where oil dripping and run engine in place until hot, watch oil track then spray area with brake cleaner and isolate oil leak. Rule out the pan gasket, however the rear main crank seal, crucifix seals, cam plug, oil galley plugs could be suspect?
 

boxster

Well-known member
Jun 1, 2009
479
96
Fallbrook Ca.
That oil (looking at the pic) appears to very clean or clear? You sure it’s not leaking from somewhere else? I worked on a loader tractor for the San Diego county one time chasing an oil leak that several technicians couldn’t isolate the source.
Many hours of gaskets and seal replacement by the other guys. Long story short it was the oil pressure switch that was leaking internally. I opened the wire loom up and out came the oil.
 

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
That oil (looking at the pic) appears to very clean or clear? You sure it’s not leaking from somewhere else? I worked on a loader tractor for the San Diego county one time chasing an oil leak that several technicians couldn’t isolate the source.
Many hours of gaskets and seal replacement by the other guys. Long story short it was the oil pressure switch that was leaking internally. I opened the wire loom up and out came the oil.
That oil has less than 300 miles on it. Since November I replaced the front cover, oil pump, front seal twice, timing chain added a sleeve to crank shaft and oil pan gasket twice once with and once without RTV. I went up to 20/50 oil to try and silence a mystery knock. It leaked as soon as I finished up the major work than I changed the gasket and went 20/50 with the same leak. Nothing seems to be coming from the front it seems to be coming from the area where the pan meets the bell housing. It's leaked or seeped oil for years but nothing like that from this area was mostly the front cover
We checked from up under and everything looked as it should around valve covers other than a seep. So i'm guessing all that's left in this neighborhood is the rear main, still don't think that's it and maybe its the crucifix. The pattern that its blowing back from is around the drain back. The front stays dry.
Once it stops raining I'm going to feel around the back around the valley pan to double check it's not from up high.
 

kris812

Well-known member
Jun 11, 2014
267
93
Tucson AZ
I still think you should pull those 2 bolts and RTV the heads and threads as they're below the pan oil level. Nothing to lose trying...

On aircraft I would use foot powder to find oil leaks because oil just blows everywhere inside the cowls.
 

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
I still think you should pull those 2 bolts and RTV the heads and threads as they're below the pan oil level. Nothing to lose trying...

On aircraft I would use foot powder to find oil leaks because oil just blows everywhere inside the cowls.
I’ll give that a try
 

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
Removed the transmission plate and the 2 rubber plugs nothing exciting. Haven’t pulled the long bolts to check. Cleaning everything up so I can see if it showed up
 

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boxster

Well-known member
Jun 1, 2009
479
96
Fallbrook Ca.
That I can do

Removed the transmission plate and the 2 rubber plugs nothing exciting. Haven’t pulled the long bolts to check. Cleaning everything up so I can see if it showed up
Looks like you have something leaking there and doesn’t appear to be trans fluid. Looking at those two long bolts they appear to be to long and are bottoming out, add a washer see if anything changes.
 

mastercamper

Well-known member
Nov 18, 2006
952
21
Erwin TN
it had maybe an ounce of oil that was on the cover when I pulled it and it looked clean on the inside. Those 2 bolts just hold the pan to the bell housing. Putting a washer on it will lead to less threads in the pan. nothing seals there.
 

boxster

Well-known member
Jun 1, 2009
479
96
Fallbrook Ca.
it had maybe an ounce of oil that was on the cover when I pulled it and it looked clean on the inside. Those 2 bolts just hold the pan to the bell housing. Putting a washer on it will lead to less threads in the pan. nothing seals there.
Could oil be wicking from somewhere up top then down or is it confined to that area shown in the photo? With a high powered flash light you should be able to isolate the leak.