My 12v leaks oil

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Red_12v

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1994
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12 valve cummins 1991
I have a 94 12v cummins that leaks oil pretty bad. It dose not leak when it is sitting it only leaks when the engine in running. Anybody know what could be my issue? Thanks!!


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GunnerJ

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I have a 94 12v cummins that leaks oil pretty bad. It dose not leak when it is sitting it only leaks when the engine in running. Anybody know what could be my issue? Thanks!!


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To be fair, it is a 12v cummins, and in my experience they leak like a sieve under normal conditions. Where is the leak coming from, up on top, down by the oil pan, front or rear of motor? Need more info

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Dennis Shellito

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Cummins IBS
I had a car once that would only leave one drop of oil on the pavement when parked but it was using too much oil. I put up with it for a while because I couldn't see where it was leaking but finally I got tired of having to check/add the oil so often, so I jacked it up where I could get under it with the engine running and used a drop light to look. I found a steady drip coming from the oil pressure sending unit. I replaced the sending unit and the car didn't use much oil afterward. I am telling you this because if anybody gave you an opinion about your oil lead it would just be a wild ass guess, so get under your truck with the engine warmed up and running and look until you locate the leak.
 

BWC

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As mentioned above we will need a bit more info such as where about it is coming from in terms around the engine. I would think its around the front cover. Let us know
 

crash68

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Is it leaking or is it marking it's spot?
LOL
 
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