CYLINDER HEAD AND VALVES - TM-5-3895-349-14-P0394

CYLINDER HEAD AND VALVES

SYSTEMS OPERATION

(75V1447-UP, 90N6121-UP)

CYLINDER HEAD AND VALVES

Engines with Serial Numbers 75V1447-UP, 90N6121-UP

CYLINDER HEAD AND VALVES

1. Push Rod. 2. Cam follower. 3.Guide support. 4. Rocker arm shaft. 5. Rocker arm. 6. Exhaust valve. 7.

Valve seat insert. 8. Intake Valve. 9. Inner valve spring. 10. Outer valve spring.

The valves and valve system components control

and exhaust valves in the cylinder head open and close

the flow of inlet air and exhaust gases into and out of the

according to the firing order (injection sequence) of the

cylinder during engine operation.

engine. One valve spring for each valve helps to hold the

valves in the closed position.

The intake and exhaust valves are opened and

closed by movement of these components; crank- shaft

There is one intake and one exhaust valve for each

camshaft cam followers push rods rocker arms and

cylinder. The valve seat insert for the exhaust valve can

valve springs. Rotation of the crankshaft causes rotation

have replacement. The valve seat for the intake valve is

of the camshaft. The camshaft gear is driven by and

machined in and is a part of the cylinder head. When the

timed to a gear on the front of the crankshaft. When the

seat for the intake valve has been machined to the limits

camshaft turns the cams on the camshaft also turn and

given in the SPECIFICATIONS

it can be bored

cause the cam followers to go up and down. This-

(machined) for a valve seat insert. The valve guide bore

movement makes the push rods move the rocker arms.

is machined in and is a part of the cylinder head.

The movement of the rocker arms will make the intake