TM 5-3810-300-24 & P2
AIR SYSTEM.
Compressor.
REMOVAL. (Illus. 4-56).
Removal of the compressor is obvious. Therefore no removal procedures are given.
DISASSEMBLY. (Illus. 4-56).
1. Remove road dirt and grease from the exterior of the compressor with a cleaning solvent.
2. Before the compressor is disassembled, the following items should be marked to show their relationship when the
compressor is assembled.
3. Mark both the front and rear end cover in relation to the crankcase.
4. Mark the drive end of the crankshaft in relation to the front end cover and the crankcase.
NOTE
A CONVENIENT METHOD TO INDICATE THE ABOVE RELATIONSHIPS IS TO USE A METAL
SCRIBE TO MARK THE PARTS WITH NUMBERS OR LINES. DO NOT USE A MARKING METHOD
THAT CAN BE WIPED OFF OR OBLITERATED DURING REBUILDING, SUCH AS CHALK. REMOVE
ALL COMPRESSOR ATTACHMENTS SUCH AS GOVERNORS, AIR STRAINERS OR INLET
FITTINGS, DISCHARGE FITTINGS AND PIPE PLUGS.
5. Mark the cylinder head in relation to the crankcase. Mark the base plate or base adpater in relation to the
crankcase.
1. Cylinder Head.
A. Remove the six cylinder head cap screws and tap the head with a soft mallet to break the gasket seal.
B. Remove the inlet valve springs from the head and inlet valves from their guides in the crankcase.
C. Remove inlet valve guides from around the inlet valve seats on the crankcase taking care not to damage
seats.
D. Scrape off any gasket material from the cylinder head and crankcase.
E. Unscrew the discharge valve seats from the head and remove the discharge valves and springs.
F. Inspect the discharge valve seats for nicks, cracks, and excessive wear and replace if necessary.
G. Inspect discharge valve stops for wear and replace if excessive peening has occurred.
H. Determine if excessive peening has occurred, measure the discharge valve travel. Discharge valve travel
must not exceed .057 inches.
I. Remove the discharge valve stops, support the machined surface of the cylinder head on an arbor press
bed and gently press the stops from the top of the head and out the bottom.
J. Be sure to allow sufficient clearance for the stops between the press bed and the bottom of the cylinder
head. The valve stop bores in the cylinder head must be inspected for excessive scoring. A new head body
must be used if scoring is excessive.
K. Discard the inlet valves and springs, the discharge valves and springs and the discharge valve seats if
defective.
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