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INSTALLATION - CONTINUED - TM-9-2320-269-34-10186
Up
TM-9-2320-269-34-1 Truck Telephone Maintenance Utility C/S 36 000 GVW 6 X 4 W/WN WI/E M876 (NSN
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ROCKER ARM-TO-VALVE TIP CLEARANCE ADJUSTMENT - CONTINUED
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

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