Quote:
Originally Posted by Turbo_Bimmer
jdd, I'm curious to learn more on what you say about larger diameter stem valves. I looked in realoem (for a 4.8is), and they don't list oversized stem valves.
Is this information in TIS?
It may be a better move to have aftermarket valve guides fitted and use the original valves instead of buying 32 new valves + the cost of machining.
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According to the Dec 2007 copy of TIS I have, the oversize valves are listed as available for the M62 (4.4 and 4.6). The standard stem diameter is listed as 6.0mm with oversizes of 6.1 and 6.2 available.
The TIS doesn’t mention anything about oversize stems available for the N62 (4.4 or 4.8) but since there are aftermarket valve guides available for the N62, I would assume you could also get aftermarket oversize valves as well.
Depending on what wears, which I assume most of the wear is in the guide and not the valve stem, if this were my car that I intended to keep, I would be looking at getting after market valve guides fitted.