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I am not a heavy duty engine guy, just w/e wrenching. I have done it on a 300SDL. I removed the cylinder head and the oil pan ( PITA job ), pushed the 6 pistons up from bottom and did a limited 'ring job'. I honed the cylinder slightly and put everything back. Make sure to cover the crank shaft when honing. The engine is running smooth now and with very little blow-by. The engine used to shake at idle and with blow-by smoke coming out from the vent-hole at the left back of the valve cover. The vent-hole is like a safety valve to release crankcase pressure. It was a lot of work and I did it on and off for 2 months.
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