Brian,
Thanks for an excellent piece of information to add to my information
toolbox!
However, in this recent thread I haven't heard anything about using thicker
head gaskets to counter lost head thickness. I know they're available, made
from various materials (metals) and thicknesses. Has anyone on the list got
any information to offer on successes or failures in using them?
Fred - So.SF
----- Original Message -----
From: "Brian Hollands" <bholland@hayes.ds.adp.com>
To: "Ronnie Day" <ronday@home.com>; "Datsun Roadster Mailing list"
<datsun-roadsters@autox.team.net>
Sent: Friday, July 27, 2001 7:03 AM
Subject: RE: Cam chain noise...again
<snip>
> If you check this and find your pattern is beginning to go over the edge
of
> the rocker pad their is one other way to correct that without going to the
> expense of new retainers and lash pads. Assuming you've got the head off,
> you can do a valve job. Let the machinist know what you're trying to do
as
> he will need to cut deeper into the seat than he normally would to create
a
> nice seat surface. As you cut material off of the valve seats and/or the
> valves, the valves will sit deeper into the head. It's usually referred
to
> as seat depth. As the seat depth increases, the valve tip height
increases
> also which gives the same effect as adding a thicker lash pad. The
> difference here is that the valve spring installed height also increases.
> There is a limit to how much you can grind away on the seat but you should
> be able to correct any problem with the wipe pattern unless it's
excessive.
> Brian
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