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 180 of 779

Note.

Before checking or adjusting exhaust

valve clearance (fig. 4-188) and intake valve

clearance (fig. 4-189), make sure both valves are

closed on cylinder being checked. Turn engine as

shown in figure 4-51 until valves are closed and

camshaft lobes are in position shown in figure 4-

73.

1. Loosen exhaust valve adjusting screw lock nut (A).

2. Turn valve adjusting screw (B) until clearance be-

tween screw pad and valve stem is 0.025 inch. Torque

lock nut to 175 pounds inch after correct adjustment is

made. Make certain setting has not changed after

tightening lock nut.

Figure 4-188. Setting exhaust valve clearance

using thickness gage blade-5210-793-7899.

4-24. Checking Intake and Exhaust Valve

Timing

a.

General.

Valve timing is checked with

cylinder No. 6R and 6L intake valve clearance

set at 0.100 inch. The flywheel is stamped (fig.

4-190) with timing marks “6R INT CLOS E

0.100 CLR ”

for timing the right camshaft

with the crankshaft, and is also marked with

timing marks “6L INT CLOSE 0.100 CLR” for

timing left. For instructional purposes the timing

of the right camshaft is described. Right and left

camshaft timing is identical. Refer to Table 4-9

for instructions pertinent to this operation.

Figure 4-190. Flywheel timing mark locations.

1. Loosen intake valve adjusting screw lock nut (A).

2. Turn valve adjusting screw (B) until clearance be-

tween screw pad and valve stem is 0.010 inch. Torque

lock nut to 175 pounds inch after correct adjustment is

made.

Figure 4-189. Setting intake valve clearance

using thickness

gage

blade-5210-793-7898.

4-98