APE 50 - Engine Fails to Start; Misfiring

7032 SOUTH 196th - KENT, WA 98032 - (253) 872-0141 / FAX (253) 872-8710
OPERATION / MAINTENANCE MANUAL
MODEL 50 VIBRATORY HAMMER WITH MODEL 260 POWER UNIT
A-3. Engine Troubleshooting (Continued...)
- APPENDIX A -
CUMMINS 6CT8.3 ENGINE
Possible Causes
1. ENGINE FAILS TO START
No Fuel to Engine
Shutoff Solenoid Sticking*
Fuel Transfer Pump
Engine Improperly Timed
Glow Plug Failure
Automatic and Safety Shutoff Controls
*Optional Equipment
2. MISFIRING
Defective Fuel Injection Nozzle
or Fuel Pump
Improper Valve Lash
Incorrect Fuel Injection Timing
Low Fuel Supply Pressure
Broken or Leaking High Pressure
Fuel Line
Air in Fuel System
Bent or Broken Push Rod
Remedy
Check for empty fuel tank, plugged fuel tank connections, obstructed or
kinked fuel suction lines, fuel transfer pump failure, or plugged fuel filters.
Solenoid must be energized to shut off engine. Actuate the control that
operates the shutoff solenoid and listen for a clicking sound. If clicking sound
is not evident and engine will not start, remove the solenoid. Again try to start
the engine. If the engine starts, the solenoid is bad. Replace the solenoid.
At cranking speed, the fuel transfer pump should supply fuel to the engine at
3 PSI (20 kPa). If fuel pressure is less than 3 PSI (20 kPa), replace the fuel
filter. Check for air in fuel system, sticking, binding or defective fuel bypass
valve. If pressure is still low, replace the fuel transfer pump.
See your authorized dealer.
Check glow plugs.
Check shutoff controls to ensure they are set properly. See Starting
Procedures.
Run the engine at the speed where the defect is most pronounced. Momen-
tarily loosen the fuel line nut on the injection pump to "cut out" that cylinder.
Check each cylinder in this manner. If one is found where loosening makes
no difference in irregular operation, the pump and nozzle for only that cylinder
need be treated.
Set to specified clearance.
See your authorized dealer.
Check fuel supply line for leaks or kinks, air in fuel system, sticking, binding,
or defective fuel bypass valve. Replace fuel filter. Check fuel pressure. Fuel
transfer pump should supply fuel at 20 to 30 PSI (l.4to2.1kg/CM2) to the
engine when the engine is fully loaded.
Replace the line.
Find source of air entry and correct. Bleed system.
Replace push rod.
Page A-15