Norm, remember to apply a dab of sealant (preferably the MB black sealant) only at the ends of the U-shaped gasket. Also, practice setting the upper timing chain cover in place a few times before applying the sealant so you avoid disturbing the gasket.

Take your time and be sure to install the upper timing chain cover bolts in their former location ... they are different lengths as I recall. Clean the bolt threads and tighten to the proper torque setting, otherwise you risk stripping the female threads in the head.

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Fred Hoelzle