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 Substantial oil leak aft of oil pan 
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Joined: Thu May 04, 2017 8:15 pm
Posts: 4
Post Substantial oil leak aft of oil pan
After running to the store and returning home I noticed a substantial oil leak aft of the oil pan out of this hole. It appears to me that this hole allows oil to exit the housing, indicating a seal of some sort has gone bad inside. It leaked from the hole at about one drip every other second for about 20 minutes, creating a nice oil slick. Also dripped slowly from the housing bolt right next to it. Not sure where to start with this one and curious if anyone has previous experience with this. Thanks in advance.


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Tue Nov 14, 2017 9:27 am
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Joined: Wed Jan 18, 2012 9:07 am
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Location: Vienna, Austria
Post Re: Substantial oil leak aft of oil pan
Scooter7

Apparently you have oil dripping out of the bellhouse. Can be from two sides: engine or gearbox.
Take out the gearbox and look for the culprit. As far as I can tell on the pics it looks like the crankshaft seal is leaking, can also be the seal on the gear housing behind.

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Tue Nov 14, 2017 9:46 am
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Joined: Sun Dec 10, 2006 7:38 pm
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Location: Southwest Wisconsin
Post Re: Substantial oil leak aft of oil pan
I had a leak that looked like this once. Turned out the seals between the oil cooler and its mounting point were leaking and running down the side of the engine, then dripping at the lowest point. Not a hard job to replace and the seals and gasket needed are under $10.

If it is actually coming out of the bell housing then it's possible the rear main seal has failed.

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Tue Nov 14, 2017 9:52 am
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Joined: Thu Apr 02, 2015 1:11 pm
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Location: Indiana, U.S.A.
Post Re: Substantial oil leak aft of oil pan
Similarly, I had a leaking fuel pump gasket that also dripped to the same location. Another easy fix. I hope yours sources back to something easy.

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Tue Nov 14, 2017 1:15 pm
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Joined: Thu May 04, 2017 8:15 pm
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Post Re: Substantial oil leak aft of oil pan
Thanks all for the heads up. I'll have to dig into it after a work trip and I'll be sure to advise on my findings, as I know i'll need guidance from there. Much Appreciated


Tue Nov 14, 2017 1:45 pm
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Joined: Sun Sep 25, 2011 11:19 am
Posts: 570
Location: Woodside, CA
Post Re: Substantial oil leak aft of oil pan
It also appears from the PIX you have a fair amount of oil leaking down the side
of the engine, which may be another clue the leak is associated with the Oil cooler
or fuel pump. One thing to try is to remove the Tranie access cover inside the
truck, then remove the small bell housing cover which would then expose the starter
drive gear and the flywheel. Look to see if the flywheel is wet with oil. I had a leak
just recently that turned out to be along the seam of the cam gear housing, was
small enough that a good application of RTV fixed that. When I pulled these access
covers it was very evifent that the flywheel and inside of the bell housing was dry.

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Tue Nov 14, 2017 2:52 pm
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Location: Idyllwild, CA
Post Re: Substantial oil leak aft of oil pan
Another clue would be that gear oil can have a smell that is distinctively different than motor oil. See if you can smell the difference, and apply that to what is dripping. But based on the color, I would expect that you are seeing motor oil. With the wind buffeting around the leak could be almost anywhere.

Another method would be to pressure wash the oil off everything down below, then start the engine idling for 20 minutes and see what drips and from where without any wind blowing it around.

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Tue Nov 14, 2017 3:06 pm
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