Oil LEAK! - Diesel Bombers



1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

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Old 11-19-2012, 09:23 PM
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Default Oil LEAK!

My VSS was acting up (again) so I crawled under the truck to take a look and there is a thick coat of fresh oil from the bell housing to the drive shaft. Can't see where the leak is due to the amount of oil every where. I just want to know if anyone else has had this problem and what's the most likely place it's all coming from?? Any help or thoughts on this would be greatly appreciated!!
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Old 11-19-2012, 09:35 PM
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Could be coming from the blow-by tube hanging down near that starter. Being in that area though, could also be a rear main seal or oil pan gasket.
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Old 11-19-2012, 09:44 PM
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It's all over the tranny and transfer case mainly but I hardly ever see any oil under the truck when it's sat for any amount of time. Just a few weeks ago I drained the oil from the tranny and put new in and there wasn't near this much oil on everything.
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Old 11-19-2012, 10:18 PM
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Did you change the trans filter? Could it be leaking from the trans pan gasket? I would try cleaning it off with some good degreaser, drive it around the block a few times, and then get back underneath to see if you can get a smaller area to look at to try to narrow it down.
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Old 11-19-2012, 10:31 PM
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I didn't change the filter. That's my plans this coming weekend. The dip stick reads normal and the tranny is still full, that's what puzzles me about it. how likely is it that the tranny is leaking around the transfer case? because the t case has the most oil on it
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Old 11-20-2012, 08:04 PM
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It is possible. If you wipe it off, is it red like trans fluid, or is it motor oil?
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Old 11-20-2012, 08:48 PM
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It's motor oil not ATF, I have a getrag.
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Old 11-20-2012, 10:07 PM
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Ah, I see. Any way you can get a picture on here?
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Old 11-20-2012, 10:28 PM
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I'll see what I can do about getting some pictures on here tomorrow. Ive never posted pictures on here so it may take a while before I get them posted
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Old 12-08-2012, 12:04 PM
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Sorry I never got any pics posted but I did find the oil leak, back valve cover was leaking. New seals and its good to go now . Thanks for the help!
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