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Balance shaft chain repair question (long)...
Posted by ChrisL (more from ChrisL) on Sun, 21 Apr 2002 20:06:59
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I've taken the timing and balance chains off my 1996 900s 2.3 with 65k miles and have a few questions about what parts to replace. First of all, this repair is not all that hard at all, there's just a ton of stuff you've got to get out of the way. I went ahead and removed the head since I had a minor oil leak at the front driver's side corner. When I went to loosen the head bolts, the one in that corner seemed easier to undo than the others, perhaps the source of the problem. Taking the sub-frame off to get to the sump is a piece of cake - not intimidating at all.
After I got the timing cover off, I was suprised to see that both of the balance chain sprockets had no teeth left. I have since read some of Anders' posts on the 9k board, and learned that he's seen this before, so I guess that's one of the failure modes. I'll agree with him that there's a heat treatment problem! Anyway, I plan on replacing the timing and balance chains, both tensioners, all of the guides, the intake, exhaust and drive sprockets for the balance chain (although the drive sprocket looks okay), the crank seal and oil pump o-ring. Naturally, I'll use a new head gasket set. So what else do I need to replace? The oil pump is probably the most suspect. It and the housing are both moderately scored. Prior to this I had no oil pressure problem - at least no warning light. I've got a bunch of pics, but no where to store them right now. I'll try to get that fixed and post some in the next day or so.
Thanks,
Chris.
posted by 68.48...
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