The archilles heel of the M116 and M117 motor is the timing chain and many a good car will die an early death if the timing chain is not changed every 100,000 miles and particularly in conjunction with the plastic sliders and hydraulic tensioner with it's own plastic slider (Liner). It was also recommended that I change the camshaft sprockets as well as this would assist in getting the cam timing nearer correct.
This is what you are endeavoring to replace.
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