1948-1952 Shop Service Manual - - Hudson-Essex-Terraplane Club

7 - 6 CLUTCH
2. Driving plate should run true at cork faces within .010"
when rotated on Vee blocks with mandrel inserted in hub
spline.
3. Hub splines must be free of burrs and nicks and must slide
freely on splines of main drive gear (clutch shaft) without
appreciable backlash.
4. Examine spring loaded hub for broken springs or stampings.
Spring cages should retain the hub in the plate
without appreciable angular backlash or sidewise lost
motion and springs should be a tight fit with no clearance
between ground ends of springs and clutch inner driven
disc to insure proper frictional load between inner and
outer driving plates.
Plates that do not meet above specifications should be
replaced.
PRELIMINARY COVER CHECK
Before proceeding with disassembly of cover and pressure
plate assembly, check for general condition of cover, fingers and
retainers. This test should be made regardless of whether the
pressure plate appears to be in good or bad condition.
1. Mount the pressure plate and cover assembly on base plate or on
a standard flywheel with a standard driving plate a n d ONE
standard gasket interposed.
2. Bring cover into firm contact with flywheel or base plate using an
arbor press or other means, then Install and tighten 8 of the 16
cover-to-flywheel cap screws.
The measurements described in the next paragraph should
always be made with the cover held to base plate or flywheel at
the front flange, not at the hub or rear wall of the cover.
3. Using a machinists combination square or depth micrometer,
measure the distance from clutch throwout
bearing contacting surface of lowest finger to top of
cover hub (A) as shown in Figure 6. On a clutch in
good condition, the distance should be 1-1/4" to
1-1/2" when the interposed driving plate is .200" to
.213" and the gaskets are .028" to .032" uncompressed
thickness.
If distance is greater than 1-1/2" the throwout fingers
and/or retainers are excessively worn or the cover is
distorted inwardly. The assembly should be disassembled
for inspection of its component parts.
If distance is less than 1-1/4", it can be assumed that
the fingers, cover and retainers are not excessively worn
and further disassembly is optional except for testing the
pressure of the engaging springs or replacing the pressure
plate. It can be assumed as satisfactory, providing fingers
clear hub of cover by at least 1/8".
PRESSURE PLATE :
NOTE: Before proceeding with disassembly of the cover
and pressure plate assembly, look for the correlation
punch mark near the outer edge of the pressure plate and
a corresponding mark near it on the cover flange. These
marks indicate the relative position of the parts when the
assembly was balanced at the factory and the marks
should be kept together to maintain the original balance.
Use a press to compress the engaging springs. With spring
load relieved, remove the 3 nuts from back of cover and
remove the cover, springs, fingers, finger retainer and sealing
washers.
FIGURE 6
Pressure plate should be free of cracks, burns or scores and
should be true within .010". Scrape all gummed oil from
pressure plate. Warpage may be readily checked by laying
pressure plate on a surface plate. If a .010" feeler can be
inserted at any point between surface plate and pressure
plate, the pressure plate should be replaced. If a surface plate
is not available, use a new pressure plate or flywheel to serve
as a surface plate.