Valve Tappet Clearance Adjustment (cont).

TM 10-3930-638-24&P

3-5. ENGINE MAINTENANCE (cont)

a. Engine Tune-up (cont).

(2) Valve Tappet Clearance Adjustment (cont).

ITEM

STEP

LOCATION

ACTION

REMARKS

TAPPET ADJUSTMENT -- COLD SETTING (cont)

f. Oil pressure

Check

Start engine and check OIL PRESSURE

(cont)

gage for normal indication. Visually

check rocker arms to insure that they are

receiving oil, then stop engine

g. Valve tappet clearance- Adjust

Proceed to step 2 below

hot setting

TAPPET ADJUSTMENT -- HOT SETTING

a. Rocker arm cover

Install

Para 3-5i

b. Engine

Warm-up

Start engine and operate (under load if

possible) approximately one hour; then

stop engine

c. Rocker arm cover

Para 3-5i

Remove

NOTE

Engine must beat normal operating temperature for each of the

following steps. If necessary, restart and run engine to maintain

normal operating temperature.

Retorque

d. Cylinder head nuts

Loosen bolt shown in position 1 approxi-

and bolts

mately 1/4 turn, then tighten to 110-115

pounds foot torque. Using same

procedure, retorque each cylinder head

nut and bolt in sequence shown

NOTE

Use extension wrench to torque nuts in positions 4 and 5.

e. Reeker arm bracket

Retorque

Para 3-5j

bolts

f. Reeker arm adjusting

Adjust

Repeat step 1 with engine at normal

screws

operating temperature

g. Rocker arm cover

Install

Para 3-5i

3-31