Thermo King 919180, Manual

Page: 72 / 148

Engine Maintenance
72
Adjust Engine Valve Clearance
1. Remove the valve cover. Torque 18 mm
diameter head bolts prior to adjusting the
valves: 26.8 ft-lb (36.3 N•m). Valve clearance
should be checked after every 2000 operating
hours, maximum. It is very important that
valves be adjusted to the correct specifications
for satisfactory engine operation. Insufficient
valve clearance will result in compression loss
and misfiring of cylinders resulting in burned
valves and seats. Excessive valve clearance
will result in noisy valve operation and
abnormal wear of the valves and rocker arms.
The intake and exhaust valves are adjusted
with the valve in the closed position.
2. The intake valve and exhaust valve are
adjusted to 0.006 to 0.010 in. (0.15 to 0.2 mm)
with the temperature at 70 F (21 C).
Turn the engine by using the belt on the
crankshaft pulley. Rotate the engine in the
direction of rotation (clockwise as viewed
next to the flywheel) from the water pump
end.
a. Turn the engine so number 1 cylinder is on
compression with piston to TDC. Both
push rods should turn freely. Adjust both
valves on number 1 cylinder.
b. Revolve the crankshaft 240° to TDC mark
on number 3 cylinder, and adjust both
valves.
c. Turn the crankshaft 240° to align TDC
mark of number 2 cylinder, and adjust
both valves.
d. Be sure to tighten locking nut while
holding the ball head screw in position.
3. Install the valve cover making sure that the
gasket is in position.
Fuel Limit Screw
The fuel limit screw is not adjustable. It is
equipped with an anti-tamper cap to fulfill
requirements for CARB (California Air Resources
Board) emission regulations. Service technicians
must be CARB certified to perform service on
fuel limit screw for equipment operating in
California. All other equipment can be serviced
per recent service bulletins with special tools and
procedures. California service technicians should
see your local Thermo King dealer for recent
bulletins.
CAUTION: Make sure the fuel rack is off
to prevent the engine from starting.