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1
Camshaft
7  Bolt, thrust plate
2
Plate thrust
8  Bearing, sleeve, front
3
Lockwasher, thrust plate bolt
9  Bearing, sleeve, intermediate front
4
Gear, timing
10 Bearing, sleeve, intermediate rear
5
Nut, self-locking, gear-to-camshaft
11 Bearing, sleeve, rear
6
Key, woodruff
Figure 7. Camshaft, exploded view.
valves, using above procedure.
Grasp valve on unworn portion of stem, close to head,
If  any  margin  is  below
and grind valve as follows:
minimum, discard valve and
(a) Position chuck so that contact is
install a new one.
just  barely  made  between
c. Installation. Reverse procedure in a above.
grinding wheel and valve face
d. Adjustment. Refer to TM 10-3980-20.
Feeding.  wheel  slowly  into
valve, make a very light cut
around  entire  valve  face,
23. Valve Guides
always keeping valve in contact
a. Inspection and Cleaning.
with grinding wheel. If the cut
(1) Remove valve ((1) through (6), par. 22).
removes metal from one-half of
(2)  Inspect guide for wear and carbon
valve face or less, inspect
deposits.
If carbon is excessive,
chucking (gripping) of valve. If
clean out with brush and/or proper
inspection  reveals  valve  is
size reamer.
If guide is worn
squarely  mounted,  valve  is
excessively  so  that  valve  stem
misalign
and
must
be
clearance
does
not
meet
discarded. If mounting is faulty,
specifications (par. 7), replace guide
check  valve  squarely  and
(b and c below).
repeat operation. When face is
b. Removal.
ground
evenly
on
(1) With valve removed (a above), remove
circumference,
the
valve
valve lifter adjusting screw.
alinement is satisfactory.
(2) Using a suitable drift, knock valve guide
(b)
After first cut has proved
(5, fig. 9) down until lower end
satisfactory,
proceed
with
approaches valve lifter, and remove
grinding operation. Do not take
guide.
heavy cuts or remove more
(3) Repeat procedures in (1) and (2) above
metal than necessary to remove
for the remaining guides
all imperfections.
c. Installation. Mark point on driving mandrel 1
(c)
When valve face has been
15/32 inches from driving end, position new valve guide,
ground,  remove  valve  and
and drive in until top of guide is 1 15/32 inches from top
check  margin  for  minimum
of cylinder block.
thickness of 3/64 inch at any
point. If margin is satisfactory,
place valve in its position in
rack  and  grind  remaining
7010A
13

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