Figure 7-4. Measuring main bearing stud stretch using dial indicator.

(b) Refer to figures 5-172 and 5-171 and

install crankcase tie rods but do not torque

tighten at this time. Refer to paragraph 7-6c.

bearing, and alternating right and left, suc-

cessively torque tighten all main bearing stud

nuts to 500 pound-inches, then, following the

same procedure and sequence, torque tighten all

nuts

final

torque

700

825

pound-

inches

(d) Following the same procedure as (a),

above, recheck stud height and apply sufficient

additional torque to each nut, as in (c), above, to

aline nut slot with drilled hole in stud, and to

obtain a stud stretch of 0.019 to 0.022-in. Do not

exceed 0.024-in. Stud stretch is defined as the

difference between the original height recorded

in (a) above, and height observed after nuts have

torque

been

refer to

torque

tightened,

specifications

(para

6-7).

7-6.

Accessory

Drive

Gear,

Crankshaft

Oil Seal, Transmission

Adapter,

and Flywheel

Refer to Table 7-2 for illustrations and

Figure 7-4. Measuring main bearing stud

assembly instructions. References are listed in

stretch using dial indicator.

the table.

Table 7-2. Accessory Drive Gear, Crankshaft Oil Seal, Transmission Adapter,

and Flywheel

Component

Reference

Accessory Drive Gear Crankshaft Oil Seal Housing

Para 7-6a and b, Figs. 5-169, 7-5, 5-168, 7-6, 7-7, 5-167

through 5-165

Para 7-6e through g, Figs. 5-182, 5-163, 7-8, 5-159, 7-9

Transmission Adapter, Flywheel, and Transmission Drive

Gearshaft Assembly

Accessory

Drive

Gear.

(2) Checking accessory drive gear backlash.

Check backlash between accessory drive gear

(1) Install accessory drive gear. R e f e r t o

figure 5-169 and alternately tighten 12 bolts to

teeth and starter drive idler gear teeth as shown

draw drive gear on to crankshaft flange.

in figure 7-5. Backlash should be from 0.004 to

Note.

Always

use

accessory

drive

gear,

0.009-inch. Check backlash between accessory

FSN 2815-861-3829 (part number - 10898778)

drive gear teeth and generator drive idler gear in

during engine assembly. This gear can be

the same manner.

identified by measuring the length of the gear

teeth,

which

are

approximately

1-15

32-inch.

7-4