Engine Maintenance
113
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.
Figure 141: Emission Control Label
Adjust Engine Valve Clearance
1. Remove the valve cover or cylinder head
cover. On the TK 3.95 engine, torque 18 mm
diameter head bolts prior to 26.8 ft-lb
(36.3 N•m) before adjusting the valves. It is
not necessary to torque the head bolts before
adjusting then valves on the TK376 engine.
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. (0.152 to 0.254
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.
CAUTION: Make sure the fuel rack is off
to prevent the engine from starting.
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