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.
MARK AT
TOP DEAD CENTER
Figure 7-21. – Flywheel Position for Top Dead Center
ADJUSTMENT
SCREW
JAM NUT
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
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.
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