Crankshaft Main Bearings

TM 9-2320-312-24-2

Truck Engine

Disassembly and Assembly Section

a. Turn the crankshaft until Tooling (A) can be

installed in the crankshaft journal. Install

Tooling (A).

b. Turn the crankshaft in order to remove the

upper half of the crankshaft main bearing. In

order to get the tab out first, the crankshaft

must be turned in the correct direction.

c. Check the condition of the crankshaft main

bearings. Refer to the Guideline For Reusable

Parts, SEBF8009, "Main and Connecting

Rod Bearings" or refer to the Guideline For

Reusable Parts, SEBV0544, "Engine Bearings

and Crankshafts".

g00516920

Illustration 229

1. Use Tooling (A) and install the upper halves of the

i01747907

crankshaft main bearings in the cylinder block.

Crankshaft Main Bearings -

Do not put oil on the back of the crankshaft main

Install

bearing.

SMCS Code: 1203-012

Installation Procedure

Table 43

Required Tools

Part

Tool

Part Description

Qty

Number

2P-5518

Main Bearing Tool

8T-5096

Dial Indicator Group

g00610152

NOTICE

Illustration 230

Keep all parts clean from contaminants.

2. Install the lower halves of the crankshaft main

bearings in crankshaft main bearing caps (2).

Contaminants may cause rapid wear and shortened

Do not put oil on the back of the crankshaft main

component life.

bearing.

Note: Place clean engine oil on the crankshaft main

NOTICE

bearings prior to assembly. Ensure that the tabs on

Crankshaft main bearing caps should be installed with

the back side of the crankshaft main bearings fit in

the part number toward the right side of the engine.

the grooves of the crankshaft main bearing caps

Crankshaft main bearing caps are to be identified by

and the cylinder block.

stamped numbers 1 through 7 located on the bottom

surface. The thrust plate is used on the number 6

crankshaft main bearing only.

3. Place crankshaft main bearing caps (2) in

position on the cylinder block. Place clean

engine oil or Molylube on the bolt threads and

on the washer face. Install bolts (1).

4. Tighten bolts (1) to a torque of 54 7 Nm

(40 5 lb ft). Tighten each bolt (1) for an

additional 90 5 degrees (1/4 turn).