Figure 6-38. Aligning Thrust Bearings.

TM 10-3930-633-34

under Fitting Main and Connecting Rod

installed in their original locations. Torque the

Bearings.

bearing cap bolts to specifications.

(10) Install the thrust bearing cap with the

(9) After the bearings have been installed,

bolts finger-tight.

apply a light coat of heavy engine oil to the

journals and bearings. Install all the bearing

(11 ) Pry the crankshaft forward against the

thrust surface of the upper half of the bearing (fig.

caps, except the thrust bearing cap (No. 5

6-38).

bearing). Be sure that the main bearing caps are

Figure 6-38. Aligning Thrust Bearings.

than the minimum limit, inspect the thrust

(12) Hold the crankshaft forward and pry the

bearing faces for scratches, burrs, nicks or foreign

thrust bearing cap to the rear. This will align the

matter. If the thrust faces are not damaged or

thrust surfaces of both halves of the bearing.

(13) Retain the forward pressure on the

dirty, they probably need realigning. Install the

crankshaft. Torque the cap bolts to specifications

thrust bearing and align the faces following the

(table 6-6).

recommended procedure (steps 8 through 11).

Then check the end play.

(14) Check the crankshaft end play (para 6-

34).

(16) Coat a new crankshaft rear oil seal with

oil and install it (fig. 6-39). Inspect the seal to be

(15) If the end play exceeds the wear limit,

replace the thrust bearing. If the end play is less

sure it was not damaged during installation.

Table 6-6. Crankshaft, Connecting Rod and Bearing Specifications

ITEM

INCHES

CRANKSHAFT

Main bearing journal diameter

.2.3982-2.3990

..0.0004

M a x i m u m out-of-round

..0.005

Wear limit . . . .

. . . 0.002

Main bearing journal runout maximum

.0.0003

Maximum journal taper (per inch)

.1.199-1.201

Thrust bearing journal length.

. :2.1228-2.1236

Connecting rod journal diameter

.0.004 -0.008

Crankshaft end play

.. 0.005 T.I.R.

Crankshaft to rear face of block runout

.. 0.040

Flywheel ring gear lateral runout.

CONNECTING ROD

. .0.9734-0.9742

Piston pin bushing I.D.

Rod bearing bore diameter . . . . .

. .2.2750-2.2758

maximum out-of -round . . . .

. . . 0.0006

.0.0004

maximum taper .

. 6.7932-6.7962

Center-to-center length . . . . . . . . . . . .

. ...012

Maximum

twist

Maximum

bend.....

. ..004

Side clearance (assembled to crankshaft)

..0.0060-0.0130

BEARINGS

. .0.0754-0.0757

Connecting rod (wall thickness-std).

0.0008-0.0015

desired

clearance

. .0.0008-0.0024

allowable

clearance

Main bearings (wall thickness-std) . . . .

. .0.0954-0.0957

desired

clearance

. .0.0005-0.0015

allowable clearance .

. .0.0005-0.0022

6-30