ROCKER ARM-TO-VALVE TIP CLEARANCE ADJUSTMENT

TM 9-2320-269-34-1

ROCKER ARMS - CONTINUED

ACTION

LOCATION

ITEM

REMARKS

ROCKER ARM-TO-VALVE TIP CLEARANCE ADJUSTMENT

This adjustment may be made with engine installed in the vehicle. Be sure that ignition key is removed from ignition

switch. Be sure that fuel shutoff valve is held in the off position. When manually rotated, the diesel engine could

start accidentally and cause serious injury to personnel.

NOTE

As viewed from the driver's seat, the right bank of cylinders is numbered 2, 4, 6, and 8 with number 2 cylinder being

at the front. Similarly, the left bank of cylinders is numbered 1, 3, 5, and 7 with number 1 being at the front. Firing

order is: 1-8-7-3-65-4-2.

Each cylinder and its valves must be adjusted. One intake valve and one exhaust valve is shown.

Repeat

procedure for all cylinders and valves in firing order.

19.

Crankshaft

Pulley nut (2)

Using 2-inch socket and ratchet handle

pulley (1)

with 3/4-inch drive, rotate crankshaft in

operating direction until number 1 intake

valve just starts to open at the number 6

cylinder.

20.

Rocker arm (3) Screw (4) and Using 9/16-inch open-end wrench and

nut (5)

3/16-inch flat-tip screwdriver, loosen.

21.

Cylinder head (6)

Intake valve (7)

a. Using thickness gage, measure gap be-

and rocker arm (3)

tween valve (7) and arm (3).

Measurement must be 0.014 inch

(0.36 mm).

b. If measurement is not 0.014 inch

(0.36 mm), go to step 22.

c. If measurement is 0.014 inch (0.36

mm), go to step 23.

22.

Rocker arm (3) Screw (4)

Using 3/16-inch flat-tip screwdrive r and

thickness gage, screw In or out until dis-

tance between arm (3) and valve (7) is

0.014 inch (0.36 mm).

2-170