I just unbolt the whole throttle assembly (pop off a few of the ball sockets first) move it aside, remove cover, adjust valves, and put back together.

I did mine on my 300SD yesterday for the first time in 20k....only two valves were tight, #2 and #3 exhaust valves....the rest were still perfect. My engine is now even smoother.

Start to finish it took me maybe 35 mins tops. Its really easy once you've done it a few times.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)