CYLINDER HEAD - TM-10-3930-623-120060

TM 10-3930-623-12

5-10. CYLINDER HEAD

5-11.

INTAKE AND EXHAUST VALVE TAPPET

ADJUSTMENT.

1. Removal.

1. Start engine and allow it to run until normal

a. Drain cooling system (para 5-17).

operating temperature is reached. Stop engine, remove

valve cover (see figure 1-2) and cover gasket.

b. Remove hose clamps (fig. 3-1), bypass tube,

upper hose, thermostat housing and gasket.

2. Start engine and insert feeler gage between valve

tappet and valve stem. (See figure 5-3.) Adjust tappet

c. Remove lead to temperature transmitter, and

until the clearance on the intake and exhaust is as

remove transmitter.

specified for the engine in Section 2.

d. Remove distributor and spark plug cables (para

3. Repeat the above adjustment procedures on all

6-53).

valve tappets. Stop the engine and inspect all visible

valve components for wear or weakness.

e. Remove spark plugs.

4. Install valve cover assembly and a new cover

f. Tag all head capscrews and key location to

gasket.

cylinder head.

5-12. FUEL SYSTEM MAINTENANCE.

g. Remove cylinder head capscrews and washers.

Lay ignition coil and bracket along side of engine.

5-13. CARBURETOR ADJUSTMENT. With the fork lift

truck on level ground, turn the idle mixture adjusting

h. Lift off cylinder head from engine. Remove and

needle with the fingers until it is barely seated, then back

discard head gasket.

off exactly one turn. Start engine and run until normal

operating temperature is reached. Adjust idle speed

2. Cleaning.

screw as required to obtain an idle speed of 450 to 500

rpm.

a. Scrape carbon from inside of combustion

chamber area with carbon scraper, or use a wire brush.

NOTE

Do not scratch surface when scraping.

Do not seat the idle adjusting needle

b. Scrape or brush gasketed surfaces of cylinder

too tightly since the tip of the needle

head and block to remove gasket paste residue. Wipe

will groove and prevent smooth

both surfaces with a cloth dampened with dry cleaning

engine idling.

Discard grooved

solvent (Fed. Spec. P-S-661).

needle and install new idle adjusting

needle as necessary.

3. Installation.

5-13.1. ACCELERATOR LINKAGE.

a. Position new cylinder head gasket on block.

1. Removal.

b. Position cylinder head on block and start

capscrews. Replace ignition coil with bracket and lifting

a. Unhook spring (8, fig. 5-2.1), release clips (9 &

eye bracket under proper capscrews.

10) and remove accelerator rod (11).

c. Tighten capscrews following sequence shown in

b. Remove cotter pin (1), unsnap pedal from

figure 5-2. Torque capscrews to 75 ft-lbs.

accelerator rod (7) and remove pedal.

c. Remove nut (3), rasher (4), and rod (5).

d. Remove 2 cotter pins (14), 2 washers (15), and

remove accelerator lever assembly (16).

2. Installation. Reverse removal procedure and install

the accelerator linkage.

5-2.4