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Old 04-10-2000, 10:52 PM
jeffsr jeffsr is offline
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Weak or broken springs, damaged cam or lifters, burned or damaged valves, worn out valve guides, to mention a few. Check the compression. If the valves are damaged, the evidence of this is generally pretty consistent. Back when I used to build big block chevy racing motors, we use roller tip aluminum rocker arms which were offset from the center of the valve stem and would impart a turning moment on the valve when opening, giving the valve a small "spin" and keeping the seats (triple angle grind) from getting pounded flat quickly (big heavy springs). Don't know if this goes on inside MBZ motors. In fact, now that I think about it, I have no idea why I mentioned it at all. DUHH!! Anyway all that other stuff I said at the beginning is what you need to think about.

Jeff L
1987 300e
1989 300e
1987 BMW 325
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