TM 5-4310-343-35
washers 5386-0007, and screws 1692-0624. Secure assembly to crankcase with two capscrews (14, figure 6-6) and
lockwashers (15) and torque to 10 pound-inches.
Remove clamp securing head assembly and install two additional
capscrews (14) and lockwashers (15). Apply oil to the discharge valve (9, figure 6-9) and position in head with lapped
face against the valve seat. Refer to figure 5-5 and calculate the spacer thickness to establish discharge valve travel.
Insert valve (9), spring (10), spacer (13, 14, 15), stop (12) and lockscrew (11).
Torque screw to 150 pound-inches.
Torque capscrews (14, figure 6-6) to 40 pound-inches, using torque adapter, part number 257002 or equivalent
(s) Refer to table 5-1 and figure 6-10 and assemble the fourth stage as follows: Rotate the crankcase 90
cw from the third stage assembly position to bring the fourth stage up into position. Assembly the valve plate (6), gasket
(7), seal plate (8), valve (9), and cylinder head (16). Use fixture No. 256996 or equivalent to press the valve plate into the
head. Refer to figure 5-6 and calculate the thickness of shim (21) figure 6-6, to establish head clearance. Peel the shim
to required thickness. Install the preformed packing (22) shim (21).
(t) Install the intake valve (5) figure 6-10, with lapped face against the valve seat in the valve plate (6).
Position the spring (4) with legs down against the valve. Place the head assembly (16) with intake valve (5) and spring (4)
in place over the head of the cylinder (2). Orient intake and discharge ports parallel to the crankshaft with discharge port
to rear. Secure the unit with two clamps, part number 255066 or equivalent, washers 5337-0600, and screws, 1692-0624.
Apply oil FSN 9150-753-4667 to the discharge valve (9) figure 6-10, and position in head with lapped face against the
valve seat. Refer to figure 5-6 and calculate the spacer thickness to establish discharge valve travel. Insert the spring
(15), spacers (12) (13) (14), stop (11) and lockscrew (10). Torque screw to 150 pound-inches.
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