TM-9-2815-200-35

ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)

TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

TM-9-2815-200-35 - Page 420 of 779

b. Cleaning.

Refer to paragraph 6-2.

c. Inspection and Repair.

Refer to paragraph

6-3 and 6-4, and (1) through (7), below.

(1)

Fan driven gearshaft and fan drive bevel

gearshaft.

Inspect fan driven gearshaft (74.1,

fig. B-26) and fan drive bevel gearshaft (74.2,

fig. B-26) to limits specified in overhaul stan-

dards (table 6-25).

Note.

If either the fan driven gearshaft or the

fan drive bevel gearshaft require replacement,

both must be replaced as they are a matched gear

set and cannot be replaced individually.

(2)

Oil seal.

Replace the oil seal at each

overhaul.

(3)

Housing assembly.

Inspect housin g

assembly (50, fig. B-27) or housing assembly

(23, fig. B-27) for loose dowel pins.

(4)

Clutch compression springs and balls.

Inspect clutch compression springs ( 39, fig. B-

27) for weakness, broken coils, and distorted

condition.

Check balls (40, fig. B-27) an d

springs to limits specified in overhaul standards

(tables 6-26 or 6-27).

Note .

Due to design changes on th e

mechanical clutch, two different size balls have

been used. Carefully inspect all balls and discard

any balls of 11 / 16 inch diameter. Overhaul

clutch assembly using only the current 5 / 8 inch

diameter balls, FSN 3110-462-0392.

(5)

Drive hub.

Inspect drive hub (41, fig.

B-27) or (46, fig. B-27) for raised metal surfaces,

loose rivets, warpage or pitted surfaces caused by

ball wear. Check bearing surfaces against limits

specified in overhaul standards (tables 6-26 or 6-

27). Repair metal sufaces by polishing pitted

areas smooth.

(6)

Clutch discs.

Inspect clutch discs (48

and 49, fig. B-27) or 21, 22, 24, and 27, fig. B-

27) for cracks, warpage, wear, or other abrasive

dam age. Inspect for excessive heat distortion.

Repairs of clutch discs are not recommended.

Replace discs if any of the above mentioned

dam age is evident.

(7) Studs. Refer to paragraph 6-4e, table 6-

28 and figure 6-148 when replacing studs.

Figure 6-148. Front fan drive housing and mounting base - studding

assembly .

6-126