Service manual. I'll email you the one when I find it.
Peter
On Jan 2, 2012, at 3:55 PM, Max Dillon wrote:
OK, I measured six valves at the head, found 0.007" for the
tightest and
0.020" for the sloppiest. Accounting for the distance from the
guide by
dividing by two would still put them all outside of the spec you
referenced.
Where can I find that specification? Looks like time for a
professional
shop to take over, I'd like to give them a copy of the spec so they
understand what I need done.
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com [mailto:mercedes-
boun...@okiebenz.com]
On Behalf Of Peter Frederick
Sent: Monday, January 02, 2012 3:51 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] Continuing the OM603 head replacment saga
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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To Unsubscribe or change delivery options go to:
http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
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For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
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