TM 9-4520-272-14&P
FIELD (UNIT) MAINTENANCE
LARGE CAPACITY FIELD HEATER (LCFH)
NSN 4520-01-500-1534
ROCKER ARM ASSEMBLY
REMOVE, ADJUST, INSTALL
INITIAL SETUP:
Tools
Personnel Required
Tool Kit, General Mechanic's Automotive (Item 2,
MOS 63J or 52C
Materials/Parts
Equipment Condition
None required
Heater shut down and engine cool
Main battery switch to OFF and handle removed
NOTE
Engine maintenance requires metric tools for the removal of all hardware and
assemblies.
HEAD COVER REMOVAL
Remove head cover (1) from cylinder head (2) by removing bolts (3). Remove cover gasket (4) only if
replacement is required.
VALVE CLEARANCE ADJUSTMENT
1. Remove flywheel housing IAW WP 0045 00.
2. Rotate flywheel in the clockwise direction until T mark (5) on flywheel matches V mark (6) on cylinder
body fin. This is the top dead center (TDC) position. Intake and exhaust valves will be in closed
position.
3. Using a gap setting gauge (7), check rocker arm (8) to valve (9) clearance. Clearance shall be 0.004
to 0.008 inch (0.10 to 0.20 mm). The amount of drag on the gap setting gauge when passing through
the gap shall be minimal.
4. If adjustment is required, loosen lock nut (10) and rotate adjusting screw (11) clockwise/counter-
clockwise to expand/reduce gap. Tighten lock nut (10) and recheck clearance.
5. Repeat steps 3 and 4 until proper clearance is attained.
6. Install head cover (1) onto cylinder head (2) using bolts (3).
7. Install flywheel cover IAW WP 0045 00.
0041 00-1
