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Discussion Starter · #1 ·
does any one know, if the entire head has to come off the motor in order to remove/replace timing Chain on a 2006 650I. My chain has apparently stretched, but looks as if I'm going to have to remove the head to get past these guid rails/bars.

Thanx,
Dawg
 

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I just finished up a total rebuild on my 645. The heads will need to come off in order to properly remove the lower timing cover. Also, replacing the timing chains will require the removal of the oil pan. Make sure that you check your valve to piston clearances, it's very uncommon for the timing chain to stretch without major component failure.
 
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