TM 5-3805-263-14&P-3
A convenient method to indicate the above relationships
REMOVING AND DISASSEMBLY
is to use a metal scribe to mark the parts with numbers
REMOVING
or lines. Do not use a marking method that can be wiped
These instructions are general and are intended to be a
off or obliterated during rebuilding, such as chalk.
guide. In some cases additional preparations and
Remove all compressor attachments such as governors,
precautions are necessary. Chock the wheels of the
air strainers or inlet fittings, discharge fittings and pipe
vehicle and drain the air pressure from all the reservoirs
plugs.
in the system.
Drain the engine cooling system and the cylinder head of
CYLINDER HEAD
the compressor. Disconnect all air, water and oil lines
Remove the cylinder head cap screws and tap the head
leading to and from the compressor. Remove the drive
with a soft mallet to break the gasket seal. Remove the
gear(s) or pulley from the compressor crankshaft using a
inlet valve springs form the head and inlet valves from
gear puller. Inspect the pulley or gear and associated
their guides in the block. Remove inlet valve guides from
parts for visible wear or damage. Since these parts are
around the inlet valve seats on the block taking care not
precision fitted, they must be replaced if they are worn or
to damage seats. Scrape off any gasket material from
damaged.
the cylinder head and block. Unscrew the discharge cap
nuts from the head and remove the discharge valves and
DISASSEMBLY
springs. Inspect the discharge valve seats for nicks,
GENERAL (SEE FIG. 5)
cracks, and excessive wear and remove and replace if
Remove road dirt and grease from the exterior of the
necessary.
compressor with a cleaning solvent. Before the
The discharge valve cap nuts should be inspected for
compressor is disassembled, the following items should
wear and replaced if excessive peening has occurred. To
be marked to show their relationship when the
determine if excessive peening has occurred, measure
compressor is assembled.
the discharge valve travel. Discharge valve travel must
Mark the rear end cover in relation to the crankcase.
not exceed 06R in.
Mark the drive end of the crankshaft in relation to the
crankcase. Mark the cylinder head in relation to the block
and block to crankcase. Mark the base plate in relation to
the crankcase.
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