Engine/Transmission (1994 - 1998) P7100 is leaking oil

[TPCDrafting]

I've been seeing an oil leak under my truck for the last 70,000 miles. :{ Just turned 120k this past weekend. First it was the crank shaft seal on the gear case cover. Fixed that when the kdp was tabbed. 2nd was a few of the valve cover gaskets and replaced them, no biggy. 3rd was the gasket between the gear case and the block, (cha-ching). Next was the o-rings between the power steering/vacuum pumps, fixed them. Now it looks like its losing oil somwhere on the underside of the pump. It doesn't look like its on the forward end, more down under the AFC housing, but down below, not at the housing. I checked with a mirror and light yesterday, but couldn't find anything specific. I thought it might be the back cover as that has been off before but it looks dry/clean. Everything under the pump including front axle, frame, chassis parts, etc. are coated and dripping. Are there any problem areas I should look for specifically? I'm almost reluctant to fix it cuz as soon as I do, I'll have another leak somewhere else. :-laf

 

[Kernel]

I've had the same problem, less the dripping on the axle and such. I hit it with some degreaser, went an oil change, and have found nothing as of yet.



Scott

 

[JKouzez]

mine is also doing that i took a pressure washer to it about 3 or 4 months ago and it started again exactly the same place drafting described i think ive heard of a throttle cable or rod seal that is suceptible to leaking, not sure though.

 

[TPCDrafting]

I wonder if that's part of that throttle cable linkage recall. Anybody? Thanks guys, glad I'm not the only one.

 

[HoleshotHolset]

The seal that might be bad in the leaky pump is NOT covered on the throttle cable recall. Both of my trucks show signs that they leak out of that throttle shaft seal just a little bit.



I believe you have to yank the pump and the governor housing on the pump to swap the seal out...



Matt

 

[Hoof Daddy]

Mines leaking there too! last 30,000 mi. Guess these trucks are kin to Harley's!

 

[TPCDrafting]

Matt, when you say "yank the pump" you mean take the p7100 out and partially disassemble the pump to get to the seal that leaks? I guess I'm doing it either way as it's leaking pretty bad.

 

[HoleshotHolset]

Yes - IMHO, you'd have to take the pump off the truck and do some bench work to pull/push the seal.



I can't even begin to imagine taking the governor housing off the pump with it still hanging off the gearcase.



I took the governor housing off a 4-cyl 'a-series' Bosch inline pump that I have and it was a bit tricky even doing it on the bench. I'm not sure if the P-7100 is exactly the same... but it was a bit of a PITA getting this one little spring back where it needed to be.



Matt