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 TM 55-1905-217-34
(j) Place the forward clutch piston (8) on a bench with the drive pin (9) slots in side of piston
facing up. Place the seal ring expander (3) in the seal ring groove at the periphery of the piston; then,
starting at the approximate center of the expander, feed the thick lip of the seal ring into the groove next
to the expander with the narrow lip of the seal ring facing the side of the piston having the drive pin slots.
(k) Install the forward clutch piston (8) in the flywheel as follows:
1. Apply a light grade of engine oil to the seal ring in the piston, and in the flywheel.
2. With the flywheel resting on the bench (ring gear side down), place the piston into
the flywheel with the slots in the under side of the piston in alignment with the drive pins in the
flywheel.
3. Lower the piston into the flywheel, and press the piston uniformly down over the
drive pins, using extreme care not to dislodge the seal rings from their grooves.
(1) Insert the end of a .006 inch feeler gage between the lip of the outer seal ring and the flywheel.
CAUTION
The end and edges of the feeler gage must be smooth and free of nicks or burrs.
1. Carefully slide the feeler gage around between the outer seal ring and the flywheel
and check for any bind on the feeler gage. Then, check the clearance between the inner seal
ring and flywheel. If a bind occurs, the lip of the seal ring may have turned up or the piston may
not be centrally located.
2. If the lip of either of the seal rings has turned up, remove the piston and install a
new seal ring. Recheck the clearance.
3. If the piston is not centered, tap the face of the piston (opposite the bind) lightly with
a plastic hammer. If the bind still exists, remove the piston and turn 120or 240 reinstall the
,
piston and again check clearance.
(m) The flywheel to crankshaft attaching bolts are not accessible after the forward clutch plate
and drive plate have been assembled to the flywheel; therefore, attach the flywheel to the crankshaft at
this stage of the assembly.
1. Attach flywheel lifting tool to the flywheel with two bolts of suitable length. Then,
with the use of a chain hoist, position the flywheel in the flywheel housing and in line with the
crankshaft.
NOTE
Since one flywheel-to-crankshaft bolt hole is off- set, the flywheel can be installed in one
position only.
2. Rotate the flywheel until the dowel pin holes in the flywheel align with the dowels in
the crankshaft. Then, pilot the flywheel over the dowels. Install two of the flywheel-to-
crankshaft bolts and tighten them sufficiently to draw the flywheel against the end of the
crankshaft.
3. Remove the flywheel lifting tool and the two bolts that were used to draw the
flywheel up against the crankshaft.
4. Place the pilot bearing retainer (23) up against the flywheel with the bolt holes in
alinement. Then, install the six flywheel-to- crankshaft bolts. Tighten the bolts to 150-160 ft- lb
5. If the flywheel attaching bolts have drilled heads, lock each pair of bolts together
with lockwire.
(n) Place the forward clutch plate (4) in the flywheel next to the piston with the spring loaded
side of the plate inside the flywheel.
NOTE
Immerse the clutch plate in a very light grade of engine oil for approximately one-half hour
before assembly.
(o) Thread a 3/8 inch-16 x 3 inch pilot stud into each of two diametrically opposite bolt holes in
the rear of the flywheel.
(p) Apply a small amount of cup grease on one end of each forward clutch release spring (10).
Then, insert the greased end of the springs into the sixteen holes in the forward face of the drive plate
(5).
(q) Attach the forward clutch drive plate (5) to the flywheel as follows:
1. Support the drive plate with lifting hook and a chain hoist and position the drive
plate over the pilot studs in the flywheel housing. Remove the chain hoist and lifting hook.
2. Carefully slide the drive plate for- ward until the release springs in the lower portion
of drive plate contact the clutch plate (4).
3. Raise the clutch plate just enough to permit the release springs to pass under it,
then push the drive plate forward until the springs contact the piston (8).
4. Install fourteen of the drive plate to flywheel attaching bolts and lock washer.
Remove the two pilot studs and install the two remaining bolts and lock washers. Tighten the
bolts uniformly to 30-35 ft-lb torque.
NOTE
Make sure the clutch plate remains free between the piston and drive plate when tightening
the bolts.
(2) Reverse Gear
(a) If removed, install the reverse clutch
3-129
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