OIL LEAK FROM TRANNY - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-08-2013, 12:26 PM   #1 (permalink)
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OIL LEAK FROM TRANNY

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.
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new timing cover
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390 W/MANUAL TRANNY
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Last edited by tickedoff36; 01-08-2013 at 12:31 PM.
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Old 01-08-2013, 01:27 PM   #2 (permalink)
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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.
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Old 01-08-2013, 01:27 PM   #3 (permalink)
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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?
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Old 01-08-2013, 02:36 PM   #4 (permalink)
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are the a/c o-rings the same material?
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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Old 01-08-2013, 02:39 PM   #5 (permalink)
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Quote:
Originally Posted by RT View Post
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??
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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Old 01-08-2013, 03:44 PM   #6 (permalink)
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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.
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Old 01-08-2013, 06:25 PM   #7 (permalink)
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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.
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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Old 01-08-2013, 07:07 PM   #8 (permalink)
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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.
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Old 01-08-2013, 07:58 PM   #9 (permalink)
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i'll pull turbo tomorro and recheck.
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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Old 01-08-2013, 08:18 PM   #10 (permalink)
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You shouldn't have to pull it - just get a mirror and light and look for wetness behind the turbo.
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Old 01-08-2013, 08:57 PM   #11 (permalink)
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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.
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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Old 01-08-2013, 09:13 PM   #12 (permalink)
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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?
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Old 01-08-2013, 09:37 PM   #13 (permalink)
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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??
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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Old 01-09-2013, 08:18 PM   #14 (permalink)
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If everything forward of the turbo is dry, then check out the turbo.
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Old 01-10-2013, 11:42 AM   #15 (permalink)
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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.
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1999.5 F350 SRW 7.3 6spd; 243k miles no mods
new timing cover
K&N air filter
replaced injectors
new HPOP
new PCMx2 & idm

OTHER TRUCK
1976 F350 FB DUELLY
390 W/MANUAL TRANNY
2 WD 4BBL
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