hi john, if it is a piston hitting the head, you can put on 2 head gaskets(use
plenty
of copper coat spray), and re torque the head several times after some heat
cycles.
or, mabe you can find a co. that makes these thicker solid copper head
gaskets.
i think i got a phone no. from jegs high perform. i used one on an L-28 6
cyl.
that had 235 lbs compress.(on a street car). another lead might be an s.c.c.a.
racer.
good luck, bob smith ,ohio.
>>>> To: datsun-roadsters@autox.team.net; dcounty@msn.com> Date: Sat, 8 Nov
2008 17:49:44 -0500> From: jover4x4@aol.com> Subject: [Roadsters] valve tick /
clatter> > List,> > I am asking for help in diagnosing a valve clatter for a
fellow Wycroc member.? His car is a 67.5 1600.? The noise is a fairly loud
valve tick at idle.? It appears to be most apparent in cylinder #1.? (We used
a screwdriver as a stethoscope and heard the noise in?the head, chamber #1).?
Upon revving the engine the noise frequency increases with rpm.? It is
definitely an upper end valvetrain noise rather than a lower end bearing
thunk.> > I have adjusted valves several times to different lashes and hear no
difference.? I have set lash to zero and still no change.? I have replaced the
rocker assembly with a good used assy I had in the garage and it made no
difference.? All cylinders are at 160psi compression.? Carbs are dialed in
correctly and the car idles well at 700rpm.? The noise started after a blown
head gasket was repaired and a valve job performed.? Owner states all new
valves were installed, seats cut by hand with a cutter (three angle cut on
seats), new guides installed and reamed correctly.? Seats were not removed
when the valve job was performed.? The head was cut .025" and the machine shop
said it had been cut once before.? So I'd estimate up to .050" has been
removed from the head.? > > About the only thing I can think of is that one or
more seats are loose in the head, or a guide is loose, or the rocker shaft
needs rebushed.? I didn't measure the head thickness, but highly doubt a valve
is hitting a piston.? > > Has anyone encountered a similar problem?? Or can
anyone offer some tech advise on further diagnosis?? Owner hopes not to have
to pull the head again but I am afraid that it may be necessary.> > Thanks in
advance, > > John Over> Denver, CO> 67 2000> 68 2000> 71 240z>
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