Fiat Kobelco EX355 Tier2, Technical Manual

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EX355 W5-9-7
TROUBLESHOOTING
ABNORMAL ENGINE NOISE
Start the engine and allow it to warm up before beginning the troubleshooting procedure.
Condition Possible Cause Correction
Engine knocking Use of wrong fuel Use correct fuel
Fuel injection timing improperly Adjust the injection timing
adjusted
Improper injection nozzle starting Adjust or replace the injection nozzle
pressure
Improper spray condition
Broken piston ring resulting in low Replace the piston ring
compression pressure
Defective fuel injection nozzle resulting Replace the fuel injection nozzle
in fuel drippage after fuel injection
Gas leakage noise Loosely connected exhaust pipes Tighten the exhaust pipe
connections
Broken exhaust pipes Replace the exhaust pipes
Loose injection nozzles and/or glow Tighten the injection nozzles and/or
plugs glow plugs
Replace the washers
Loosely connected exhaust manifold Tighten the exhaust manifold
connections
Damaged cylinder head gasket Replace the cylinder head gasket
Continuous noise Loose fan belt Readjust the belt tension
Loose cooling fan Retighten cooling fan
Worn or damaged water pump bearing Replace the water pump bearing
Worn or damaged alternator bearing Replace the alternator bearing
Valve clearance improperly adjusted Adjust the valve clearance
Slapping noise Valve clearance improperly adjusted Adjust the valve clearance
Damaged rocker arm Replace the rocker arm
Worn or damaged crankshaft and/or Replace the crankshaft and/or thrust
thrust bearings bearings
Worn or damaged crankshaft and/or Replace the crankshaft and/or
connecting rod bearings connecting rod bearings
Worn or damaged connecting rod Replace the connecting rod bushing
bushing and piston pin and/or piston pin
Worn or damaged piston and cylinder Replace the piston and cylinder liner
liner
Foreign material in the cylinder