7 Examine wear plate (23) Circular patterns burnished
on the surface of the cam plate are normal
If the circular patterns on the wear plate are extensive
and can be felt with the fingernail or If angular scratches
are evident. the plate must be discarded. See Fig. 210.
8. Match up dowel pin (39) in cam assembly with hole in
wear plate (23) and seat plate (23) In cam. See Fig.21
Inspecting piston shoe
ON THE LAST FEW PASSES, PLACE 5-6 SHEETS OF
EMERY PAPER AS A CUSHION UNDER THE TOP
SHARPNESS. Check the reworked piston shoe against
the tolerance limits in Fig. 213. If the piston does not fall
within the tolerance limits, It must be discarded.
Fig. 123 Installing cam reaction plate
Check for proper seating by pushing down on first one
edge and then the other in a rocking motion. If any
looseness is felt, remove the cam plate (23) and clean
the cam assembly and wear plate to remove any foreign
particles from beneath the wear plate. Reposition wear
plate (23) and again check for proper seating. If cam
Often, large scratches on the piston shoe running
plate still does not seat properly, check plate (23) for
surface will "heal over" If placed back In service. It
flatness and replace if necessary.
is recommended however, that all piston shoes
with badly scratched running surfaces be either
9. Check clearance between bronze piston shoe and
reworked within tolerance limits or replaced.
steel piston body (55). With a push-pull motion check for
free play between shoe and body. If any free play can be
11. Inspect steel piston body If any galling Is
felt, the piston must be replaced.
apparent or If any Irregularities can be felt, the piston
must be discarded.
If damage Is present, check
10. Inspect the bronze piston shoe running surface.
corresponding cylinder block bore (40) for similar
During normal service, a dulling of the running surface
is to be expected. If large scratches are present, make
several short passes over 500 grit emery paper on a lap