Might as well hone cylinders,and rering pistons,and change bearings,go another 400k

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

Suggest a leak down test before disassembly to identify any problems such as rings. Valve seals, definitely replace if disassembling the head. Use new bolts or measure the old as per factory specs. Replace the timing chain.

Read up on how the chain tensioner gets disassembled and reset unless you already understand how it works.

Use an inch pound torque wench on the rocker arm to head bolts, the threads in the head pull out easily.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

My M104.980 has just been redone at 420k Kms (not miles). As you say, they fitted new bearings and rings and overhauled the head etc.

They said no need to touch the bores as they looked perfect, retaining the original machining marks. I was happy with that.

RayH