Valve Tappet Clearance Adjustment.

TM 10-3930-638-24&P

3-5. ENGINE-MAINTENANCE (cont)

a. Engine Tune-up (cont).

(2) Valve Tappet Clearance Adjustment.

This task covers adjustment of tappet clearance for engine intake and exhaust valves.

INITIAL SETUP

EQUIPMENT CONDITION

TOOLS

Paragraph

Condition Description

Automotive Mechanic's

Vehicle parked on level surface, engine off,

NSN 5180-00-754-0641

Tool Kit

and parking brake applied.

FSCM 10988 P/N M20419

Extension Wrench

2-53c

Left side panel removed.

Top hood removed.

2-53d

MATERIALS/PARTS

Engine positioned at TDC for No. 1

3-5a(1)

No. 30 engine oil

cylinder.

Rocker arm cover gasket

Rocker arm cover removed.

3-5i

REMARKS

ACTION

ITEM

LOCATION

STEP

TAPPET ADJUSTMENT -- COLD SETTING

NOTE

The cold setting valve tappet clearance must be adjusted when-

ever arms or push rods have been removed. Do not attempt to

start engine until cold setting tappet clearance adjustment has

been performed.

Loosen adjusting screw until a 0.012 inch

Adjust

a. Rocker arm adjusting

feeler gage can be placed between rocker

screw for No. 1

arm and valve stem as shown, then turn

cylinder intake valve

adjusting screw clockwise until rocker

arm-to-valve stem clearance is 0.012 inch

3-29