Grrrr Transmission still leaks after front seal change - 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 06-15-2009, 02:19 PM   #1 (permalink)
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Grrrr Transmission still leaks after front seal change

The worst feeling ever, you spend two and a half days pulling the transmission and replacing the front pump seal, and bushing, the large o-ring around the fluid pump and the damn thing still is leaking. from the inspection hole.

The fluid is red which narrows it down to tranny fluid, but I guess I am gonna get a UV test kit to make sure that it is tranny fluid.

I replaced everything, what else could it be? anybody have any ideas? I am so frustrated I could spit blood.
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Old 06-16-2009, 06:22 AM   #2 (permalink)
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I have seen a few pumps actually leak through the aluminum they become porous.
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Old 06-16-2009, 01:57 PM   #3 (permalink)
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What did the convertor look like where the seal rides.I have seen the old seal wear a groove in the surfaceof the convertor stub and the new seal would not seal on the uneven surface.
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Old 06-17-2009, 03:53 AM   #4 (permalink)
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The TC didnt look scorned or rough where the seal was riding. I also noticed that there was no oil on the front face of the pump. Which to me if the fluid was coming from front pump seal the tranny fluid would run down the face of the pump, would this be the case?
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Old 06-17-2009, 05:31 AM   #5 (permalink)
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Originally Posted by Chan93lx50 View Post
The TC didnt look scorned or rough where the seal was riding. I also noticed that there was no oil on the front face of the pump. Which to me if the fluid was coming from front pump seal the tranny fluid would run down the face of the pump, would this be the case?
If the front pump seal is leaking the fluid would run down the middle of the pump on the outside.

How bad is the leak? If you installed all of the seals properly. It could be leaking from the converter neck or the pump itself. Both are rare but i have seen it before.
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Old 06-18-2009, 08:54 AM   #6 (permalink)
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The leak at idle can create a small puddle about the size of my hand in a bout 20 mins
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Old 06-18-2009, 12:45 PM   #7 (permalink)
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Thats a bad leak. Verify that the leak is coming from the bellhousing, if so, drop it back out, and take some pictures.
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Old 07-02-2010, 03:23 AM   #8 (permalink)
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For anyone else having this is issues or your seal has gone out and your tranny is pueking fluid you MUST take the flywheel off and inspect it, Closely.. This is a common issues f350's and 450's are having. My tranny guy pulled one out of the trash and showed me the hairline cracks that develop around the crankshaft end. When we pulled mine off I thought I was ok, but upon wire wheeling it mine was cracked, thus creating the wobble that destroyed the seal that caused the leak. $160.00 bucks from the dealer with his jobber discount, Advanced,Discount and other parts stores had the China ones for cheaper but there is no way I would trust them. Good luck.
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Old 07-02-2010, 02:38 PM   #9 (permalink)
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It's quite common for the factory diesel converters to actually twist the studs from the torque of the diesels on the back side of the converter and leak. This is the main reason for the billet converters. Replacing the pump bolt washers is a must and adding a little anerobic sealant to the washers is a good idea also. We always replace the converter anytime one comes in for front seal leak. Period. All get a New bushing, seal, pump oring, and gasket. As mentioned, we've been catching leaks on the dyno from cracked pumps. I like to replace them whenever I can or am allowed to. Cracked flywheels as mentioned above can contribute to this also.
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