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Thread: Engine oil leaking from the bell housing

  1. #1
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    Engine oil leaking from the bell housing

    I got oil leaking out of the bellhousing when the jeep is running(amc 258). The dipstick tube was broken so i replaced it. The oil was coming out of from the dip stick tube running down over the starter and onto the front drive shaft. So i thought it was maybe pooling the the bellhousing aswell. So the dipstick tube was replaced and is perfectly sealed...problem solved. I took it out to the arena parking lot for some testing and everything was ok for the afternoon. When i was taking it off the trailerit started leaking again. So its coming from somewhere else. Has anyone ran into this before or have any insight? It is engine oil not gear oil cuz the t-5 uses atf.

    cheers

    Lucas

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    main rear seal or leaking from the back of the head
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    Only thing I can think of is a leak from the rear main seal, unless its from something near the top of the motor at the back thats leaking down the motor.

    But usually when oil is leaking from the bellhousing its leaking from the rear main seal
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    rear main, and it is a very common thing for jeeps.
    if its just a tiny leak i wouldnt worry about it

  5. #5
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    Quote Originally Posted by gof28 View Post
    rear main, and it is a very common thing for jeeps.
    if its just a tiny leak i wouldnt worry about it
    Its definitely coming out enough to need corrective action.

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    then you need to make sure its actually coming from the rear main, if so either pull the tranny or pull the motor

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    The easiest thing to check right off the bat is the valve cover gasket. I have a 258 and have a very hard time sealing my valve cover, with the warping from heating and cooling the back opens up and allows oil to drain down the back of the engine making it look like you have a rear main leak.
    For the cost of a $10 fork or $80 fel-pro gasket I would take an hour and check this one first.

    Good luck and let me know how it works out, one leaky 4.2 to another.
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    So i ended up pulling the pan today and discovered that the rear part of the oil pan gasket had been replaced with a ton of rtv...it was a real mess. That could have been contributing/ the cause of the problem. I got a new one piece oil pan gasket so that will fix that issue. Im still going to do the rear main seal tomorrow anyways since i cant find a clear origin of the leak. I have been reading write ups and some guys say to loosen all the bearing caps others say just to remove the rear cap without loosening the others....any comments or clarification? Here are some pics just for the hell of it.





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    The idea behind loosening the caps is to relieve pressure off the rear seal to be able to pop it out. Its never a bad idea to loosen them - it makes banging it out and getting the other one in a lot easier. Just remember to torque them all back in correct order and torque specs.

    Oh, another thing - RTV the rubber gasket a little bit to hold it in place.. its damn near impossible to get the end bit near the rear to stay in place when you go to put it on the motor.
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    one piece gasket is a good start to getting it soeted out
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    Got it all in and back together. No leaks soo far! It was a pretty straight forward job. Looks like the cause was the upper portion of the seal. Aswell the little tab on the lower portion was missing and was replaced with a bunch of rtv. Here are some pics.




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    theres your problem for sure...
    If its a mechanical device i can fix it

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    Havin essentially the same problem with my dakota. I don't really have the facilities to change the rear seal, so it should be a fun job.
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    i have the same issue, do you have to separate the tranny from the engine to fix this?

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    ^nope, just drop the oil pan and rear main bearing cap.

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