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I've read all the post on this board about oil relief valve, timing and balance chain.
I've also read many of the FAQ (saabstuff) guides and articles (including ones from Andrews of Princeston, which really scares me)...
I totally agree with you in that I am not sure of the orgin of failure.
What i know:
I see the timing chain "stretched" with quite of bit of guide wear (what I can see without taking the timing cover off yet.)
I see half of the circumference of the relief valve cylinder vertically scored. It was stuck in the bore.
The oil pan (and inside valve cover) was absolutely clean except for bits from the balance chain and guide.
I have yet to look inside the timing cover to see what damage is there.
I think I've always had an increasing noisy engine, but somewhere 15K miles ago, it got noticably worst. Last 2 oil change, I noticed for the first time that there were metal flakes on the magnetic drain plug. I also noticed at around the same time, I am consuming both a little bit of oil and coolant...(not enough to be too alarming by itself...as I get excellent fuel economy and good stable idle).
From that, I guess that I slowly lost oil pressure resulting in the chain drives agressively wearing, and throwing out bits of metal, acelerating the process. Can it be as simple as the oil pressure relief valve?! If there was debris from the chain drive, is the crank shaft downstream from it? What about the relief valve?
If I don't see any damage in the crank shaft/bearings, I think I am safe to replace the chain drives and oil pump bits and keep monitoring my oil pressure...
What do you think?
posted by 71.227.7...
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