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
- APPENDIX A -
CUMMINS 6CT8.3 ENGINE
Possible Causes Remedy
10. EXCESSIVE FUEL CONSUMPTION
Fuel System Leaks Large changes in fuel consumption may result. Internal leaks will
probably be accompanied by low engine oil pressure and increased oil
level in the engine oil sump. Replace leaking components.
Fuel and Combustion Knock Small but measurable increases in fuel consumption maybe the result of
defective fuel nozzles, misfiring or factors contributing to loss of power.
See ITEM 2 and ITEM 5.
Incorrect Fuel Injection Timing See your authorized dealer.
11. LOUD VALVE TRAIN NOISE
Bent or Broken Valves Replace damaged parts.*
Broken Camshaft Replace all damaged parts. Clean engine thoroughly.
Broken or Severely Worn Valve Lifters Replace camshaft and valve lifters. Check for sticking valves and bent
valve stems. Clean engine thoroughly. Set valve lash to specified clear
ance.
12. EXCESSIVE VALVE LASH
Severely Worn Cam Lobes Check valve lash. Replace camshaft and followers. Clean engine
thoroughly. Set valve lash to specified clearance.
Broken or Severely Worn Valve Lifters Replace valve lifters. Check camshaft for wear. Check for sticking valves
and bent valve stems. Clean engine thoroughly. Set valve lash to speci-
fied clearance.
Valve Tip Wear Set valve lash to specified clearance. If wear is excessive, replace valve.
Moderate Valve Lifter Face Wear Set valve lash to specified clearance. If wear is excessive, replace valve
lifter.
Push Rod Wear Set valve lash to specified clearance. If wear is excessive, replace push
rod.
Rocker Arm Anvil Wear Set valve lash to specified clearance. If wear is excessive, replace rocker
arm.
Insufficient Lubrication Check lubrication in valve should be very wet at high idle speeds, but only
damp at low idle. Oil passages should be cleaned, especially those
leading to the cylinder head.
A-3. Engine Troubleshooting (Continued...)
Page A-18
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