Clutch
Please remember to clean all surfaces on pressure plates and flywheels prior to installation,
so that no oil or grease finds its way to the surface of the disc.
if pressure plate and disc are replaced, be certain that flywheel surface is flat
and not burned. if the flywheel is burned, be sure to have it surfaced with
a grinder designed for the purpose, such as a Blanchard grinder. When the flywheel
is badly burned, you may experience some clutch chatter when engagement is
made in low and reverse. Most clutch chatter is found to relate to the disc and
not the pressure plate, as most people believe.
The clutch disc is
made up of a hub, a drive plate (to which facings are attached), a back plate
(or retainer plate), two facings and, in McLeod's disc eight springs are used
as are four drive- or stop-pin rivets.
If your clutch assembly starts
to chatter in low or reverse, most of the problem will lie in the lack of Marcel
between the facing. Actually, Marcel is nothing more than the wavy spring portion
of the drive plate where the facing is riveted onto it. This wavy portion
is designed to allow the pressure plate to squeeze the disc to the fly-wheel
and allow all the surfaces to move at the same speed when the disc is finally compressed
flat by the pressure plate engagement.
If the Marcel is too
flat (or goes flat), the pressure plate will attempt to squeeze the facing upon
engagement, hit bottom and skip across the face of the disc, thus causing chatter.
When
installing the pressure plate to the flywheel, make certain
that your pressure plate bolts do not bottom out in the flywheel threads before
the pressure plate is pulled down tight to the flywheel. When flywheels are
surfaced (or ground), the counterbore for the shoulder on the bolts is reduced;
thus, if too much material is removed, the shoulder on the bolt will contact
I or bottom out) on the threads in the flywheel, preventing the pressure plate
form pulling down tight, setting you up for erratic clutch problems.
Proper
installation is the most important part of a clutch replacement. Next
comes proper adjustment.