"Actually my valve adjuster screw is flat, completely flat, interesting
that your is spherical, that would make sense.....
I just adjusted my valves this past weekend so you'd think I'd remember
better but I think my adjuster screw ends looked pretty flat and they
didn't seem to contact nice and flush either,...
"
Remember that the rocker swings through an arc while the valve moves up and
down in a linear path. Therefore, the angle of contact between the valve
adjuster screw (on the rocker) and the valve top is constantly changing
through the lift cycle of the valve. This means that the contact between
those two parts CAN'T be "flat", as it would only be flat at one point in
the rotation of the rocker. Also, the two parts slide against each other
slightly as well. This is why you can buy roller tip rockers for V8
performance engines. I've worked on an 85 and 87, both having a rounded
screw. I've also rebuilt a Toyota and a Suzuki, both with this type of
valve adjustment, and they had the rounded ends as well, and I suspect
yours do too. When I say semi-spherical, I don't mean it's a big ball on
the end. It's hard to see with the rocker in the engine. Next time you do
the valves, remove one of the adjuster screws and take a look; you will see
that it has a fairly large radius round on the end. You will also see wear
marks; little flattened spots due to running in a certain valve adjustment
position for a while.
Dave, as for your cam bearings, the Clymer manual calls out the bearing
diameters. I would hope that before these cams were remanufactured those
surfaces would have been mic'ed, but you can remove the cams and measure
them with a caliper. You can also measure the lobes, both the base circle
and the nose height. YOu don't have specs to compare against, but you can
check them for consistency. Between you and Mike you have had no end of
trouble with that set of cams, which is very strange.
Jeremy
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