Engine Cylinder Head; Valve Clearance; Head Bolt Torque - Kohler 15CCO Service Manual

WARNING
Rotating parts.
Can cause severe injury or death.
Operate the generator set only when
all guards, screens, and covers are in
place.
Tightening the hardware. Flying projectiles can cause
severe injury or death.
hardware or pulley to release from the generator set engine
and can cause personal injury. Retorque all crankshaft and
rotor hardware after servicing. Do not loosen the crankshaft
hardware or rotor thrubolt when making adjustments or
servicing the generator set. Rotate the crankshaft manually in
a clockwise direction only. Turning the crankshaft bolt or rotor
thrubolt counterclockwise can loosen the hardware.

Valve Clearance

The engine uses poppet-type valve mechanisms which
are adjusted as follows:
1. Remove screws and carefully lift rocker-arm cover
off engine.
Be careful not to damage gasket or mating
surfaces. Gasket must be replaced if damaged.
2. Turn engine over to obtain maximum clearance
between intake/exhaust valves and related rocker
arms. This occurs during the period between the
closing of the intake valve and the opening of the
exhaust valve.
3. Using a feeler gauge, check the clearance
between each rocker arm and its related valve. See
Figure 3-18. The clearance should be 0.0079 in.
(0.2 mm). If not, loosen the locknut, turn the
adjusting screw, and retighten the locknut. Then
recheck the clearance again.
4. After checking the clearance of all eight valves,
realign the gasket, install the rocker-arm cover, and
secure by installing and tightening the cover
screws.
TP-5606 6/02

Engine Cylinder Head

Loose hardware can cause the
NOTE
1
1. Clearance
2. Adjusting Screw
Figure 3-18. Valve Clearance Adjustment

Head Bolt Torque

The head bolts should be retightened as follows:
1. Remove screws and carefully lift rocker-arm cover
off engine.
Be careful not to damage gasket or mating
surfaces. Gasket must be replaced if damaged.
2. Retighten each head bolt in the sequence shown in
Figure 3-19 to a torque of 54.2 to 65.1 ft. lbs. (73.5
to 83.3 Nm).
3. Realign the gasket, install the rocker-arm cover,
and secure by installing and tightening the cover
screws.
10
18
12 3
1
14
6
16 8
1. Generator End
2. Exhaust Manifold Side
Figure 3-19. Head Bolt Tightening Sequence
2
3
3. Locknut
NOTE
2
1
5 7 15
13
11
4
2 9 17
4
3. Fan End
4. Intake Manifold Side
Scheduled Maintenance 3-19
3