Join Date: Mar 2003
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Ground strap routing and rear pinion seal
got a couple issues going on right now w/ my 1998 TJ (4.0L) that I am going to address this weekend, and I have some related questions.
1. The under-hood ground straps are completely rotted off, have been for some time, and I suspect this may be the cause for some electrical problems I've been having. I do have a set of replacement straps, but I'm unsure of the original/proper routing. I think one was from hood to firewall, and there's at least 1 other strap. Can't recall if there were 2 or 3 total.
Where should these straps be routed? IIRC one was connected to a spot on the engine block, where exactly on the block does it connect?
2. The entire underside of my rear diff has a thin coat of gear oil on it. The plug is not leaking, so that means it's either the cover gasket or the pinion seal.
There is also some slow dripping from the cover/housing mating area, but this might just be because it's the lowest point of the housing so the oil naturally migrates there before falling to the ground. I am concerned it may in fact be the pinion seal because if it were just the cover, I wouldn't expect it to be covering the entire housing, since the wind from driving should spray it back and not forward.
This started right after I had a brake line replaced, and I suspect some brake fluid got sprayed from the junction block on the rear axle while the guy was bleeding the lines. I figure it probably ate and ruined either the gasket seal, the pinion seal, or both. I am going to replace the gasket this weekend, but obviously the pinion seal is a relatively major undertaking.
Does the above hypothesis sound valid? Would brake fluid be able to destroy/compromise the pinion seal material (silicone I'm assuming?), or should the seal be intact and maybe I just need to wash the undercarriage to get rid of the brake fluid residue and the seal should still be good? (As well as replace the cover gasket and gear oil.)