TM 5-3805-258-24-1
T R O U B L E S H O O T I N G
T E S T I N G
A N D
A D J U S T I N G
1. ENGINE CRANKSHAFT WILL NOT TURN WHEN START SWITCH IS ON
Cause
Correction
Battery Has Low Output
Make Reference to Item 26.
Wiring or Switches Have Defect
Make Reference to Item 26.
Starter Motor Solenoid Has
Make Reference to Item 25.
A Defect
Starter Motor Has A Defect
Make Reference to Item 25.
Inside Problem Prevents Engine
If the crankshaft can not be turned after disconnecting the driven
Crankshaft From Turning
equipment, remove the fuel nozzles and check for fluid in the cy-
linders 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 wrong pistons installed in the engine.
Cause
Slow Cranking Speed
No Fuel In The Housing For The
Fuel Injection Pumps
Dirty Fuel Filter
Dirty or Broken Fuel Lines
No Fuel To Cylinders
Bad Quality Fuel
Fuel Has “Cloud Point” Higher
Than Atmospheric Temperature
(“Cloud Point” = Temperature
Which Makes Wax Form In Fuel.)
Wrong Fuel Injection Timing
Over Fueling Spring Not Installed
2. ENGINE WILL NOT START
Correction
Make Reference to Item 26.
Fill the housing for the fuel injection pumps with fuel with the
priming pump. Remove the air with the bleed valve.
Install new fuel filter.
Clean or install new fuel lines as necessary.
Put fuel in fuel tank. “Prime” (remove the air and/or low quality fuel
from the fuel system).
Remove the fuel from the fuel tank. Install a new fuel filter element.
Put a good grade of clean fuel in the fuel tank.
Drain the fuel tank lines, and fuel injection pump housing. Change
the fuel filter. Fill the tank with fuel which has the correct “cloud
point” and remove the air from the system with the priming pump
and bleed valve.
Make adjustment to timing.
Install over fueling spring.
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