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 TROUBLESHOOTING
TESTING AND ADJUSTING
2b. ENGINE WILL NOT START - GOVERNOR TERMINAL SHAFT OPENS AT LEAST HALF WAY OR MORE AT
CRANKING AS OBSERVED BY OUTBOARD SHAFT ROTATION
Cause:
Correction:
Slow Cranking Speed
Battery has low output, make reference to Item 29.
No Fuel To Injectors
Check fuel tank and fill. "Prime" (remove the air and/or low
quality fuel from the fuel system).
Install new fuel filters if necessary.
Blocked or broken fuel lines should be cleaned or replaced.
Check the fuel transfer pump for damage or wear and make
replacements as needed.
Control lever, on governor terminal shaft, not connected to the
fuel control linkage such as improper assembly during overhaul.
Make sure governor linkage is correctly engaged.
During cranking, the air-fuel ratio control will restrict injector rack
to approximately 7 to 9 mm (.28 to .35 in.) which is below the fuel
setting as set by the engine fuel setting screw. Once the lube oil
pressure signal reaches the air-fuel ratio control from the engine,
the rack will be further restricted to approximately 0 mm (0 in.).
The engine must be running and generating boost pressure
before the air-fuel ratio control allows more injector rack travel.
A worn or damaged start-up override valve in the
hydramechanical protective system can also hold the governor in
the shutoff position. On later engines, after a fault condition, the
start-up override valve must be used to release the hydraulic
pressure on the fuel shutoff actuator before the engine can be
started again. Make a replacement and make sure the governor
and control linkage move.
Bad Quality Fuel
Remove fuel from the tank. Install new fuel filters and put a good
grade of clean fuel in the fuel tank.
Fuel Pressure is Low.
At starting rpm, the minimum fuel pressure from fuel transfer
pump must be 20 kPa (3 psi). If fuel pressure is less than 20 kPa
(3 psi) change the fuel filters. Look for air in the fuel system. If
fuel pressure is still low, check the fuel bypass valve and the fuel
transfer pump for correct operation.
Wrong Fuel Injection Timing
Make adjustment to timing.
93
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