Quantcast ENGINE CRANKSHAFT WILL NOT TURN

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TROUBLESHOOTING
TESTING AND ADJUSTING
1. ENGINE CRANKSHAFT WILL NOT TURN WHEN START SWITCH IS ON
Cause:
Correction:
Battery has Low Output
Check condition of battery. Charge battery or make replacement
as necessary.
Wiring or Switches Have Defect
Make repairs or replacements as necessary.
Problem with Engine Protective
Make reference to ELECTRIC PROTECTIVE SYSTEM, in Form
System
SENR2984 or Form SENR2985.
Starter Motor Solenoid Has A
Install a new solenoid.
Defect
Starter Motor Has a Defect
Make repair or replacement of starter motor.
Oil Pressure Switch For Prelubri-
Make a replacement of defective switch.
cation Pump Has A Defect
Prelubrication Oil Pump Has A
Repair or replace pump components as needed.
Defect
Inside Problem Prevents Engine
If the crankshaft can not be turned after disconnecting the driven
Crankshaft From Turning
equipment, remove the fuel injectors and check for fluid in the
cylinders while turning the crankshaft. If fluid in the cylinders is
not the problem, the engine must be disassembled to check for
other inside problems.  Some of these inside problems are
bearing seizure, piston seizure, or valves making contact with the
2a.
ENGINE WILL NOT START - GOVERNOR TERMINAL SHAFT
DOES NOT MOVE FUEL CONTROL LINKAGE
Cause:
Correction:
Low Oil Level In Governor
Check gauge and add correct amount of clean oil to
WOODWARD UG-8 GOVERNORS.  Check for plugged oil
supply passages to CATERPILLAR 3161 GOVERNORS.
Too Much Binding In Control
Engine can start cold, but with hot oil governor does not develop
Linkage
enough pump pressure to move linkage. Check linkage effort
and correct.
Speed Control Shaft Setting Too
Move control shaft toward high idle while cranking engine.
Low (Low Idle Not set Correctly)
Terminal shaft on properly operating governor will move fuel
control linkage to the "FUEL ON" position.
Solenoid Stuck In Shut Off
On UG8L remove top cover assembly and make sure shut down
Position
strap is up. Crank engine to start. Repair or make a replacement
of faulty solenoid.
Problem with Engine Protective
Make reference to ELECTRIC PROTECTIVE SYSTEM, in Form
System
SENR2984 or Form SENR2985.
Solenoid Energized in Shutoff
Disconnect wiring harness to stop signal. Correct by
Position During Cranking
troubleshooting wiring to solenoid.
Low Oil Pressure In Governor
The governor oil pump relief valve may be stuck open or leaking.
Correct by governor disassembly and cleaning.
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