TM 9-2320-272-24-4
5-29. CRANKSHAFT AND GEAR MAINTENANCE (Contd)
NOTE
Ensure main bearing caps are installed with mating cylinders.
Number on main bearing caps should face camshaft.
18.
Apply clean engine oil to coat threads of fourteen screws (2).
19.
Position seven main bearing caps (3) on engine block (14) and crankshaft (7) and tap main bearing
caps (3) using soft-head hammer until seated on main bearing journals (6).
20.
Install main bearing caps (3) on engine block (14) with fourteen screws (2). Tighten screws (2)
125 lb-ft (170 Nm) in sequence shown.
21.
Remove fourteen screws (2) and seven main bearing caps (3) from engine block (14).
22.
Measure width of plastic strip at widest point using plastigage. If plastic strip does not measure
0.0026-0.0053 in. (0.660-0.1346 mm), replace all upper (10), lower (1), and thrust (11) bearings.
e. Assembly
NOTE
Perform steps 1 through 3 if gear was removed.
1.
Install new dowel pin (5) in crankshaft (7).
2.
Apply GAA grease to lobe (8) of crankshaft (7).
3.
Press crankshaft gear (9) on crankshaft (7).
f. Installation
CAUTION
Late and early model engine main bearings and main bearing caps
and components are not interchangeable. Mixing components will
cause damage to engine.
NOTE
Perform step 1 if inspection did not require replacement of main
bearings.
Perform step 3 for late model engines, serial number 44487830
and after.
Piston cooling nozzles are located in all upper chain bearing
seats, except for No. 3 cylinder.
1.
Remove six upper main bearings (10) and thrust bearing (11) from engine block (14).
2.
Install six piston cooling nozzles (15) in upper main bearing seats (12). Ensure piston cooling
nozzles (15) seat below main bearing surface.
3.
Install twelve piston cooling nozzles (15) in upper main bearing seats (12). Ensure piston cooling
nozzles (15) seat below main bearing surface.
NOTE
Apply lubricating oil to all main bearings and bearing surfaces.
4.
Align tangs (16) of six upper main bearings (10) with slots (17) of main bearing seats (12) and
install on engine block (14).
5-202