Figure 4-9. Checking flywheel runout.

TM 5-4320-234-34

Install the flywheel and recheck runout. If runout still

(1) Remove the six nuts (5, fig. 4-13) and

exceeds 0.008 inch (0.0200 cm) replace the flywheel.

lock washers (6) that secure the flywheel (7) and ring

gear (8) to the crankshaft (36); remove the flywheel.

(2) Remove the capscrews (11, fig. 4-21),

shoulder screws (13), and lockwashers (12 and 14) that

secure the flywheel housing (15) to the block (41);

remove the flywheel housing and gasket.

b. Cleaning, Inspection, and Repair.

WARNING

Clean all parts in a well-ventilated area.

Avoid inhalation of solvent fumes and

prolonged exposure of skin to cleaning

solvent. Wash exposed skin thoroughly.

Dry cleaning solvent (Fed. Spec. P-D-680)

used to clean parts is potentially dangerous

to personnel and property. Do not use near

open flame or excessive heat. Flash point of

solvent is 100 F. to 138 F. (38 C. to 59 C.).

(1) Clean the flywheel and flywheel housing

with cleaning solvent (Fed. Spec. P-D-680); dry

Figure 4-9. Checking flywheel runout.

thoroughly.

(2) Inspect the flywheel housing for cracks,

(4) Check flywheel eccentricity by mounting a

distortion, and damaged threads; replace a damaged

dial indicator so that it indicates the inside diameter of

flywheel housing.

the flywheel counterbore (fig. 4-10); rotate the crankshaft

(3) Inspect the flywheel for chipped,

through one revolution. If the flywheel is eccentric more

cracked, or broken teeth on the ring gear,

than 0.008 inch (0.0200 cm), loosen and retighten the

distortion, worn or out of-round bolt holes, and

flywheel mounting bolts and recheck eccentricity. If

other damage. If the ring gear is damaged,

eccentricity still exceeds 0.008 inch (0.0200 cm),

replace as follows:

replace the flywheel.

CAUTION

When you heat the ring gear, be careful not

to damage the flywheel.

(a) Heat the ring gear with a torch and

remove the ring gear from the flywheel.

(b) Heat the replacement ring gear and

cool the flywheel.

the flywheel. As the ring gear and flywheel approach

the same temperature, the ring gear will contract to

achieve a tight fit on the flywheel.

c. Installation.

(1) Position the flywheel housing (15, fig. 4-

21) on the block (41); secure with shoulder screws (13),

capscrews (11), and lockwashers (12 and 14).

(2) Position the flywheel (7, fig. 4-13) on the

crankshaft (36); secure with six bolts (9), lockwashers

(6), and nuts (5). Tighten the nuts to 35 to 40

footpounds (4.8405 to 5.5320 kgm) torque.

(3) Check flywheel runout by mounting a dial

indicator so that it indicates the flat vertical surface of

Figure 4-10. Checking flywheel eccentricity.

the flywheel (fig. 4-9); rotate the crankshaft through one

full revolution. Hold pressure against the flywheel to

(5) Check runout of the flywheel housing face

eliminate crankshaft end play.

If flywheel runout

by mounting a dial indicator so that it indicates the

exceeds 0.008 inch (0.0200 cm), remove the flywheel

housing face (fig. 4-11); rotate the crankshaft through

and clean the crankshaft flange and flywheel seat.

4-12