Section II. ENGINE COMPONENTS

(3) Inspect all parts for cracks, breaks, wear,

f. Installation. Install water pump in reverse order

stripped threads, or other damage; replace if damaged.

described in paragraph 3-50b.

e. Assembly. Refer to figure 6-8 and assemble the

water pump.

Section II. ENGINE COMPONENTS

6-9. General

(3) Refer to figure 3-55 and install rocker arm

This section contains those items which are considered

cover.

components of the engine assembly.

6-11. Manifolds

6-10. Rocker Arm Shaft

a. General.

Refer

paragraph

3-80a

for

a. General. The rocker arm shaft is mounted on

description.

top of the cylinder head. The movement of each push

rod is transmitted by rocker arms to the intake and

b. Removal.

Refer to paragraph 3-80c and

exhaust valves.

remove the manifolds.

b. Removal.

c. Disassembly.

Refer

figure

6-10

and

disassemble manifold.

(1) Refer to paragraphs 3-81b(1) through 3-

d. Cleaning and Inspection.

8b(5) and remove parts as described.

(2) Refer to figure 3-55 and remove valve

(1) Clean gasket surfaces between intake

cover.

'and exhaust manifold also clean surface where

manifold comes in contact with cylinder head.

(3) Refer to figure 6-9 and remove rocker

arm shaft, by removing six nuts (21) and washers (20).

(2) Inspect for cracks.

c. Disassembly.

Refer

figure

6-9

and

e. Reassembly.

Refer to figure

6-10

and

disassemble rocker arm shaft.

reassemble manifold using new gasket.

d. Cleaning, Inspection, and Repair.

f. Installation. Install manifolds in reverse order of

removal.

(1) Clean the rocker arm shaft, rocker arms

6-12. Cylinder Head

and attaching parts with a clean cloth and an approved

cleaning solvent. Blow out all oil passages with clean

dry compressed air.

a. General. The cylinder head is mounted on top

of the cylinder block and held securely in place by large

(2) The wear on the rocker arm shaft and

capscrews. It consists of a series of passages which

bushings will ordinarily be quite light, providing

lead to and from the exhaust and intake manifolds. The

adequate oil circulation to those parts is maintained.

valves are positioned in the cylinder head where the

Nevertheless whenever the rocker arm shaft has been

engine breathing is done. The combustion chambers

removed, the rocker bushings, rocker shaft bearing

are incorporated in the cylinder head, where the

surfaces, valve contact end of the rocker arms, and

gasoline and air mixture is compressed and ignited to

adjusting screw should be inspected for excess wear.

deliver engine power.

(3) All worn parts should be replaced, if

b. Removal.

rocker bushings are required they must be pressed in

place and reamed to .0015 to .0018 running clearance

on rocker shaft.

(1) Drain coolant from system.

(2) Refer to paragraph 6-10b and remove

e. Reassembly.

Refer

figure

6-9

and

rocker arm shaft.

reassemble rocker arm shaft.

(3) Refer to paragraph 6-llb and remove

f. Installation.

manifolds.

(4) Refer to figure 6-7 and loosen clamp (6)

(1) Refer to figure 6-9 and install rocker arm

at thermostat housing and slide hose assembly away

shaft.

from thermostat housing.

(2) Refer to paragraph 3-78c and adjust valve

clearance.

6-9