TM 9-2320-260-34-1
11-5. AIR COMPRESSOR REPAIR (Contd)
1.
Install mounting plate on crankcase (1) with two screws (2).
2.
Position mounting plate and crankcase (1) in vise.
CAUTION
If piston pin cannot be installed by hand pressure, heat piston
in hot water to expand pin bore. Failure to do so may damage
piston.
Coat all metal parts with a thin film of oil prior to assembly.
position connecting rod (13) in piston (16).
3.
Install one retaining ring (7) in piston pin groove (8) and install piston pin (9) into piston pin
4.
bore (14) and connecting rod (13).
Install second retaining ring (15) in piston pin groove (6).
5.
NOTE
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.
Install oil ring (5) in bottom piston groove (12).
6.
7.
Install compression ring (4) in the middle piston groove (11).
NOTE
Install compression ring marked "TOP" in step 8.
Install compression ring (3) in the top piston groove (10). It is the closest to the crown of the
8.
piston (16).
CAUTION
Do not force piston into cylinder. This can damage rings and/or
cylinder wall.
Install ring compressor on piston and rod assembly (17).
9.
10.
Lubricate piston and rod assembly (17) with clean lubricating oil.
11.
Install piston and rod assembly (17) into crankcase cylinder bore (18).
Install pipe plug (24) and key (25) on crankshaft (22).
12.
13.
Lubricate crankshaft journals (23) and thrust bearing (20) with clean lubricating oil.
Install crankshaft (22) in front support (21).
14.
15.
Install thrust bearing (20) on crankshaft (22).
16.
Using arbor press, install drive gear (19) on crankshaft (22) with protruding edge on
crankshaft (22).
11-22
