TM 9-2320-272-24-2
4-31. AIR COMPRESSOR MAINTENANCE (Contd)
1.
Install retaining ring (11) in piston pin bore (10).
2.
Place piston end of connecting rod (9) in piston (8).
CAUTION
Do not drive piston pin into bore. Damage to piston will result.
Install piston pin (7) through piston pin bore (10) and connecting rod (9) until seated against
3.
retaining ring (11).
CAUTION
If piston pin cannot be installed in piston by hand pressure,
l
place piston in hot water to expand piston pin bore to allow
removal. Driving pin in piston may cause damage to piston.
l Coat all metal parts with a thin film of lubricating oil prior to
assembly.
Install retaining ring (6) in piston pin bore (10).
4.
NOTE
l Compression rings and oil ring gaps must be installed 180
apart. If rings are not staggered 180, leaks will develop during
the compression stage resulting in decreased efficiency.
l Ensure ends of compression rings do not overlap.
Install oil ring (4) and two compression rings (3) and (5) in bottom piston ring groove.
5.
NOTE
Ensure compression ring is installed with the word TOP toward
crown of piston.
6.
Install compression ring (1) and intermediate ring (2) on piston (8) and stagger gaps 180 apart.
Lubricate with clean lubricating oil.
7.
Install mounting plate on crankcase (13) with two screws (14).
8.
Position mounting plate and crankcase (13) in vise.
9.
Install ring compressor on piston and connecting rod assembly (12).
CAUTION
Do not force piston into cylinder. This can damage rings and/or
cylinder wall.
Lubricate piston and connecting rod assembly (12) and crankcase (13) with clean lubricating oil.
10.
11.
Install piston and connecting rod assembly (12) in crankcase (13) cylinder bore.
12.
Lubricate crankshaft (18) and install in support (17).
13.
Install pipe plug (19) in crankshaft (18).
Install thrust bearing (16) in support (17) on crankshaft (18) end. Ensure notches are toward
14.
crankshaft (18).
15.
Using arbor press, install drive gear (15) on crankshaft support (17) with protruding end of drive
gear (15) toward crankshaft (18).
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