Quote:
Originally Posted by andrewwynn
Chains don't really stretch. A 180,000 mile chain from an M62 I measured about 8-10mm longer than new (less than 1/2%).
Tensioner loses tension allows the chain to slap around. It's how the M62 chain takes out the guides. The N62 has one piece guides that are more robust and much shorter chains using two vs one.
I haven't looked into the exact geometry to explain the example above but usually the chain won't start "chain sawing" through the engine until the tensioner stops working and enough slap builds in the chain to tear out the guide and then the free slip of the chain becomes inches vs mm.
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It was quite a pressure from the chain on the vanos solenoid, nearly impossible to get it out. Canīt imagine that itīs the tensioners fault but it can be bad chains.
When itīs time to do som work on it I will find the fault and let you all know.