The specs for 61x engines is ZERO to 0.02 mm (0.0005").
Yes, that's correct, about 0.0005". They aren't going to wear TIGHT,
after all, and have to seal against exhaust pressure. If the oiled
valve stem will go into the guide and the spring will close it, it's
fine. They will NOT usually go in dry -- if they do, they are too
loose.
The valves are chrome moly, they are only going to wear if something
harder than granular gray cast iron is used for the guide.
American machine shops are obsessed with sloppy valve guides and
"oiling" the valve stems for some reason, they all want them rattling
in the guide and blowing like a steam engine exhaust. Never could
figure that out, some shops will even spiral cut an "oil channel"
down the guide.
All it does is cause oil burning and bad compression, since the valve
cannot seal on a ring seat if it's at all off axis..
Peter
On Jan 2, 2012, at 2:14 PM, Max wrote:
Peter Frederick <psf...@earthlink.net> wrote:
If you can feel movement of the valves in the guides AT ALL they are
way oversize.
Spec is 0.02 to 0.05mm new, you cannot feel that at all. In fact, if
the valves won't stay up in the guide against the seat with the
spring out the guides are shot and need to be replaced.
Peter, .05 mm is less than .002 inches; that is really tight!
--
Max Dillon
Charleston SC
'95 E300, '87 300TD
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