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In Reply to: timing chain piston - tightened but turned - ok? posted by Todd Kenyon on November 10, 2001 at 11:36:29:
It looks to me that the chain tensioner must have been an afterthought for BMW. Our engines are so well designed until it comes to this kluge.
The weak link here is the fact that the assembly is a "banjo bolt" type affair. If you've ever tried to remove just the piston and spring, you find that the entire things turns when you really just want to remove the large nut on the end!
Having installed many camshaft sprockets to experiment with the cam timing, I've dreaded this device every time.
I don't think it will hurt anything if the tensioner diaphram isn't exactly parallel to the ground. You might think that to correct the problem, all you should need to do is loosen the nut a little, rotate the diaphram so that it's a little PAST level in the other direction, and retighten the nut.
But this usually doesn't work because it's the whole assembly that has turned! What a poor design!
I've struggled with this many times. If it were me, I think I'd leave it where it is if it's pretty close.
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