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Section 7
DIAGNOSTIC TESTS
TEST 35- CHECK VALVE ADJUSTMENT
DISCUSSION:
If the engine is having a hard start, no start, or rough
running condition, then the valves will need to be
checked for proper clearance. If a unit has a lot of
hours on it, the valves will need to be readjusted.
PROCEDURE:
1. Remove the valve cover from engine.
2. Disconnect the battery.
3. Manually turn flywheel until cylinder #1 (furthest from flywheel)
is at top dead center (TDC) and adjust the clearances of the
intake and exhaust valves of the No. 1 cylinder and the
exhaust valve of the No. 2 cylinder.
Figure 7-21. – Flywheel Position for Top Dead Center
Figure 7-22. – Valve Adjustment Points
4. Check valve clearance using a feeler gauge. Both should have
a clearance of 0.008” - 0.012”.
5. Adjust by loosening the nut and turning the adjustment screw.
6. Turn the crankshaft counterclockwise by 204° (view from front)
to adjust the clearance of the intake valve of No. 2 cylinder and
the intake and exhaust valves of the No. 3 cylinder.
Figure 7-23. – Checking Valve Adjustment
RESULTS:
1. If clearance is incorrect, readjust
2. If clearance is correct, proceed to next test on flow chart.
TEST 36- FUEL INJECTOR PUMP
DISCUSSION:
The fuel injector pump takes the fuel that is provided
by the electric fuel pump, and delivers it to the fuel
injector nozzles. Given that the fuel solenoid is oper-
ating correctly and the linkage from the governor is
not binding, the fuel injector pump will need little to no
maintenance.
PROCEDURE:
1. If fuel injector pump is assumed to being faulty, remove the
fuel lines going to the nozzle injectors.
2. Prime the engine for 15-20 seconds.
3. Crank the engine and watch to see if fuel is coming out of the
fuel lines.
CAUTION: Fuel is hazardous.
NOTE: Bleeding the fuel injector pump takes
time. Crank the engine for 15 second intervals for
as long as 5 minutes.
4. If no fuel is coming out, remove the four (4) screws mounting
the injector pump to the engine.
5. Unscrew the fuel solenoid from the side of the injector pump.
6. Lift fuel injector pump out and remove one shim.
7. Reinstall fuel injector pump and retaining screws.
JAM NUT
ADJUSTMENT
SCREW
MARK AT
TOP DEAD CENTER
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