NOTICE -807640706

TM 9-2320-312-24-2

Truck Engine

Disassembly and Assembly Section

5. Install crankshaft main bearing caps with the

part numbers toward the right hand side of

NOTICE

the cylinder block. Ensure that crankshaft main

Keep all parts clean from contaminants.

bearing caps have numbers 1 through 7. The

numbers should start at the front of the engine.

Contaminants may cause rapid wear and shortened

Place clean engine oil or Molylube on the bolt

component life.

threads and the washers.

Note: When the bolts for the rear main bearing cap

NOTICE

are tightened, slide the main bearing cap as far

Ensure that the crankshaft main bearing tabs engage

forward as possible until the cap is against the

with the grooves in the block and the crankshaft main

bolts. Hold the main bearing cap in this position

bearing cap.

and tighten the bolts.

1. Check the condition of the main bearings. Refer

to Guideline For Reusable Parts, SEBF8009,

"Main and Connecting Rod Bearings" or refer

to Guideline For Reusable Parts, SEBV0544,

"Engine Bearings and Crankshafts".

Note: The number six main bearing is the thrust

bearing.

2. Clean the bearing surfaces in the cylinder block

for the main bearings. Apply clean engine oil on

the upper main bearing. Do not put engine oil on

the back side of the bearing surfaces. Install the

upper main bearing in the cylinder block. Ensure

that the tab on the back side of the bearing

g00609985

Illustration 235

engages with the groove in the cylinder block.

6. Install bolts (2) and the washers for main

bearing caps (3). Tighten bolts (2) to a torque of

54 7 Nm (40 5 lb ft).

7. Turn bolts (2) for an additional 90 5 degrees

(1/4 turn).

g00610100

Illustration 234

3. Put clean engine oil on the journals of the

crankshaft bearing. Fasten lifting straps and

a hoist to crankshaft (1). Carefully install the

crankshaft in the cylinder block.

g00610119

Illustration 236

4. Clean the bearing surface of the main bearing

caps. Install the lower main bearing in the

8. Check the end play of crankshaft (1) with Tooling

crankshaft main bearing caps. Ensure that the

(A). The end play must be 0.07 mm (0.003 inch)

tab on the back side of the bearing engages

to 0.32 mm (0.013 inch).

with the groove in the main bearing cap. Apply

clean engine oil on the lower main bearing.

Do not put engine oil on the back side of the

bearing surfaces.