PISTON RINGS

19. FLYWHEEL (Fig. 17)

control ring. The piston pins are hollow and

are hardened steel to give long service life.

The cast iron flywheel, with a replaceable

The piston pins are held in the piston pin boss

ring gear, provides for the attachment of the

by a retaining ring at each end of pin.

clutch assembly. The flywheel is bolted to the

14. PISTON RINGS

rear flange of the crankshaft and is dynamically

balanced.

The two top piston compression rings are

20. CYLINDER HEADS

double beveled (Keystone) type and chrome

faced. The third compression ring is not beveled.

The two cylinder heads are identical and

The face is tapered and chrome plated. The

interchangeable as assemblies. They incorpor-

ring is marked "TOP" on top side of ring. The

ate the overhead valve arrangement. The cast

oil control ring is straight faced and has a

iron heads have replaceable valve guides

chrome face and an expander spring. The spring

and valve seats. Each cylinder head covers

forces the ring against the cylinder wall.

three cylinder bores and has intake and exhaust

valve port openings. The intake port openings

15. CAMSHAFT ASSEMBLY AND BUSHING-

in the heads are so designed that an air swirl

TYPE BEARINGS (Fig. 17)

is created as air enters the combustion chamber

(par. 5). Each cylinder head has openings for

The camshaft assembly is solid and made

the cylinder head water outlet manifolds.

of forged steel. The camshaft is supported in

the cylinder and crankcase by four steel-backed,

copper- alloy replaceable bushing-type bearings.

21. VALVES AND VALVE SPRINGS (Fig. 17)

A thrust plate located between the camshaft

The six intake and exhaust valves are con-

gear and crankcase is used to control cam-

structed of a special steel. Each valve has an

shaft end play.

inner and outer valve spring and a valve rotator.

The valve springs are secured in position with

16. TAPPETS AND PUSH RODS (Fig. 17)

a retainer and two keys.

The 12 tappets are solid and are counter-

22. ROCKER ARM SHAFTS AND SUPPORTS

bored to accept the push rods. The bottom of

(Fig. 17)

the counterbore is machined to serve as a bear-

ing surface for the push rods. The tappets are

The two rocker arm shafts are constructed

drilled to allow oil drainage. The 12 push rods

of heat treated seamless or welded steel tubing.

are tubular with the lower end machined to fit

The rocker arm shafts are secured. to the two

the bearing surface of the tappet. The upper

cylinder heads by rocker arm shaft supports.

end of the push rod is machined to fit the valve

The supports are interchangeable and are drilled

rocker arm adjusting screw bearing surface.

to permit oil from the oil pressure pump to

pass through to the rocker arm shafts. The

17. CRANKSHAFT AND CAMSHAFT GEARS

shafts are also drilled to distribute oil to the

(Fig. 17)

individual rocker arms.

The helical crankshaft gear is pressed on

23. VALVE ROCKER ARMS (Fig. 17)

and keyed to the crankshaft. The crankshaft

gear drives the camshaft gear. The steel helical

The twelve rocker arms are hot- rolled,

camshaft gear is keyed to the end of the cam-

heat-treated, carbon steel stampings. The steel-

shaft. Two teeth on the camshaft gear and one

backed, bronze-faced, rocker arm bushings are

tooth on the crankshaft gear are punch marked

not replaceable.

for proper valve timing alinement.

24. INTAKE MANIFOLD

18. CRANKSHAFT VIBRATION DAMPER AND

The one piece cast aluminum intake manifold

PULLEY ASSEMBLY (Fig. 17)

is water jacketed. Coolant is circulated through

the jacket, and heat thus transferred to the

The molded rubber type crankshaft tor-

induction air improves the cold weather com-

sional vibration damper and pulley assembly

bustion characteristics of the engine. The ther-

is mounted on the front end of the crankshaft.

mostat housing (fig. 1) is secured to the front

The triple pulley drives the water pump (fig. 1),

flange of the manifold. The intake manifold also

generator (fig. 3), and air compressor (fig. 1).

houses the water temperature sending unit.