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Old 02-20-2011, 08:47 AM
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1993 Grand Cherokee Chrysler 42RE problems

Here's a brain buster. Today on the way to a friends house I smelled transmission fluid burning. Got out and found a nice steady stream coming from the bell housing. Naturally I assumed the front pump seal blew out, so I towed it home and pulled the transmission.

First of all, the front pump, seal, and pump to case gasket are all around a year and a half old, replaced due to an unrelated issue. The torque converter is a remanufactured unit about 2 years old. This is a 1993 Grand Cherokee with the 42RE (A500) transmission, by the way.

Anyways, I haven't been able to pinpoint the issue. The seal looked absolutely fine, No nicks, cuts, or other deformities. The spring was in place on the back side of it. There's no cracks in the pump or case.

I also pressure tested the torque converter, and it held 40 pounds of pressure no problem.

The only other possibility is the paper gasket between the pump and case. I've never seen one blow out before though, especially not one that was only 18 months old.

Any ideas?
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Old 02-20-2011, 08:50 AM
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could be the pump, if it is worn the fluid can get aerated and then things start cooking, Aeration (foaming) can also happen if it is overfull.
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Old 02-20-2011, 01:53 PM
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The pump is 18 months old with less than 10,000 miles. There was no foaming, fluid level was just below the full mark when idling in neutral last time I checked it, and the leak began upon start up judging by the puddle in my drive way, not once it was warmed up.

It really seems like it would just be the front seal, but after seeing it I have a hard time believing it would cause that large of a leak.
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Old 02-20-2011, 02:38 PM
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Are you sure it didnt leak after it was parked there for a while?
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Old 02-21-2011, 04:17 AM
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Quote:
Originally Posted by Jr. Mechanic
Here's a brain buster. Today on the way to a friends house I smelled transmission fluid burning. Got out and found a nice steady stream coming from the bell housing. Naturally I assumed the front pump seal blew out, so I towed it home and pulled the transmission.

First of all, the front pump, seal, and pump to case gasket are all around a year and a half old, replaced due to an unrelated issue. The torque converter is a remanufactured unit about 2 years old. This is a 1993 Grand Cherokee with the 42RE (A500) transmission, by the way.

Anyways, I haven't been able to pinpoint the issue. The seal looked absolutely fine, No nicks, cuts, or other deformities. The spring was in place on the back side of it. There's no cracks in the pump or case.

I also pressure tested the torque converter, and it held 40 pounds of pressure no problem.

The only other possibility is the paper gasket between the pump and case. I've never seen one blow out before though, especially not one that was only 18 months old.

Any ideas?
are you checking the fluid with the trans in neutral while running? if it does not have an updated manual valve from the rebuild, it needs to be checked in neutral, otherwise your going to be roughly 1 1/2 qts of fluid overfull and when it gets hot, its going to vent. which is at the top of the pump.
odds are you just over filled the trans and it vented.
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Old 02-21-2011, 08:58 AM
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Quote:
Originally Posted by Jr. Mechanic
The pump is 18 months old with less than 10,000 miles. There was no foaming, fluid level was just below the full mark when idling in neutral last time I checked it, and the leak began upon start up judging by the puddle in my drive way, not once it was warmed up.

It really seems like it would just be the front seal, but after seeing it I have a hard time believing it would cause that large of a leak.
^, definitely not overfilled. The next step is to pressure test the case and see where the fluid comes out.
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