LT4Abe

Hi, I replaced my water pump on the LT4 2 days ago, now I have an oil leak at the front of the engine. Pretty good one, 8 inch diameter puddle on the ground and the front crossmember is pretty well covered, the bottom two spark plug wire boots have oil on them and some of the pass. side wires have some oil slung on them.
I did notice some play in the water pump drive shaft during install, I could wiggle it just a little bit.
Any help would be greatly appreciated, I have a feeling I might have to do it all over again and replace the drive shaft seal... Bummer.
Thanks a lot

chb88

:iagree: Sounds like you missed the seal

autotech

Missed what seal. If all you removed was the water pump, then all you could leak would be water...

iceman_t1

Abe, I just replaced my water pump last week on my LT1. When I took the pump off, there was a coupler that fit over the spline shaft coming out of the front of the engine cover and the spline shaft on the pump. Before I put the coupler on the shaft on the front of the engine, I put a small O-ring seal on that shaft and then put the coupler on the shaft. I pushed the seal all the way to the back of the shaft and the coupler pressed against it. Maybe that is the seal you are missing.

Here is the GM part number for the seal I bought. #10128343

Hope that helps.

Daniel DK

hmmm i have the same problem as lt4abe and i used the special gm-tool to install the seal in the timingcover. I i didn't notice a seal that fits over the shaft that protrudes the engine- is it an o-ring?

:cheers:

iceman_t1

Daniel, Yes, it is a small rubber O-ring. When I went to GM to get it, their assembly pic showed in at that location.

LT4Abe

Hey guys thanks for the input. You'll never guess what i did, i took it all apart again replaced the opti and the w/pump d/shaft seal, it looked like it was leaking a little, put it all back together and it is still leaking.

I think the crank hub/harmonic balancer hub seal is the culprit. Time for round 3!!!

96BLKTN

Just did mine twice so I feel your PAIN.. The o-ring on the water pump I can't see that it would seal anything but the shaft it sits in. I re-torqed all of the bolts on the timing chain cover. I hope it helps. I had gunk all over the cover and water pump. I am thinking the water pump gear seal in the timing cover might be the culprit??? :thumbs:

STL94LT1

Use a balancer repair sleeve, and replace the timing cover seal, it will stop the leak.

LT4Abe

A balancer repair sleeve??? I will have to look into that one. Thanks, I am going to replace the three seals in the timing cover, the w/pump driveshaft seal(again), the distributor seal, and the balancer seal. This will hopefully stop the leaking.
Thanks for your guys's input.

STL94LT1

Balancer hub repair sleeve: NAPA Balkamp part # 600-2016.

SouthernSon

The source of my oil leak (and several other's leaks) was at the sensor at the bottom of the cover. It has a small o-ring, also. One screw and you're there. I would try it first.

oopps! 8" oil puddle? don't think it is the sensor. I just noticed the part of the puddle in your post.......


[Modified by southern_son, 8:51 AM 4/20/2004]

LT4Abe

Thanks for the replies, and the part number for the tool. I got the seal for the hub from the dealer and I will hopefully install tomorrow, and I will check out the crank position sensor while I'm down there. But like you said 8" puddle is probably not coming from there. I will post when I finally resolve this issue.