OIL LEAK FROM TRANNY - Diesel Forum

tickedoff36 · 01-08-2013, 12:26 PM

well i got everythng back together and the big leak stopped and now it leaks engine oil from back of the bell housing. could this be the rear main? the rest of engine is dry. NEED HELP ON THIS ASAP truck has been down 1 month and i NEED to get this running.

RT · 01-08-2013, 01:27 PM

The rear main is a very aggressive seal - they rarely, rarely fail. How much oil are we talking about? Are you quite sure it isn't residual from your former leak? I would thoroughly clean the top end (purple power or simple green) and flush it really well. Then try to verify you have another leak. Turbo pedestal o-rings are a possibility. The EBPV activator can leak. Fuel leaks can mimic oil leaks. There are so many options much more common than rear main seals on this motor.

Bill1013 · 01-08-2013, 01:27 PM

Looks like your gonna have to tear it down again and replace the rear main seal.

Whats with a 6spd. on a 99? What tranny do you have?

tickedoff36 · 01-08-2013, 02:36 PM

are the a/c o-rings the same material?

tickedoff36 · 01-08-2013, 02:39 PM

Quote:

Originally Posted by RT

The rear main is a very aggressive seal - they rarely, rarely fail. How much oil are we talking about? Are you quite sure it isn't residual from your former leak? I would thoroughly clean the top end (purple power or simple green) and flush it really well. Then try to verify you have another leak. Turbo pedestal o-rings are a possibility. The EBPV activator can leak. Fuel leaks can mimic oil leaks. There are so many options much more common than rear main seals on this motor.

it is about 1/4 cup with 3 minutes of idle. could the orings leak down inside the tranny and run down the top inside of bell housing??

RT · 01-08-2013, 03:44 PM

Yes - the valley has a drain hole out the rear. Anything and everything that leaks from the top is going to run down the back of the motor.

tickedoff36 · 01-08-2013, 06:25 PM

the valley is dry i looked. i checked it with the air tubes removed and it did not leak. put it all together and started to leak. the flywheel is wet exept for ring gear and center hub ; where it bolts to crank.

RT · 01-08-2013, 07:07 PM

Were you able to look behind the turbo? The front part of the valley can be dry and still have a leak from the pedestal or the EBPV solenoid.

tickedoff36 · 01-08-2013, 07:58 PM

i'll pull turbo tomorro and recheck.

RT · 01-08-2013, 08:18 PM

You shouldn't have to pull it - just get a mirror and light and look for wetness behind the turbo.

tickedoff36 · 01-08-2013, 08:57 PM

i will need to get a mirror. i was also thinking if it is leaking to use the oil pan gasket maker to help seal and buy me time untill i can afford to do it right.

91diesel · 01-08-2013, 09:13 PM

The orings are cheap, do it right the first time if your going to pull it. A mirror is also cheap. While your at it buy a can of brake clean

Keep everything clean and covered, clean the mounting surfaces well and use new seals. Have pride about the work you do on your truck.

6 dollars. Riffraff Diesel: Turbo / Pedestal O-rings

So your saying you took something apart and then it started leaking?

tickedoff36 · 01-08-2013, 09:37 PM

the leaks started when i replaced timing cover, got worse within a few miles. was coming from oil pan, that is fixed now it leaking down thru the bell housing.where else could it be coming from??

91diesel · 01-09-2013, 08:18 PM

If everything forward of the turbo is dry, then check out the turbo.

tickedoff36 · 01-10-2013, 11:42 AM

yeah i pulled turbo and pedistal and 1 of the ped bolt was heavily covered in oil, and the ped was dry, so i am assuming that is the problem. i am thinking it is the engine to ped seals, i am going to replace ALL anyway. i should have replaced when pullid turbo 1st time. oh well live and learn.