Quote:
Originally Posted by sixto
??? The valve guides aren’t in the combustion chamber.
Sixto
98 E320s sedan and wagon
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No they aren't, they're in the head and keep the valves moving in a linear direction. Let them wear out and the valves get sloppy and you get an egg-shaped wear pattern in the valve seat. The result is a poorly seated valve and subsequent leakage. All 12 valves were loose in the guides in mine, the wear was still early enough that the existing seats could be recut and stay within tolerance.