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Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
  • Difficult to start during hot or cold start
  • Worn piston.
  • INSTALL a new piston.
  • Piston ring(s) worn, damaged or sticking.
  • INSTALL new piston ring(s).
  • Worn cylinder.
  • INSPECT and REPAIR the cylinder.
  • Head gasket damaged.
  • INSPECT the head gasket.
  • Fuel system damaged or inoperative.
  • Ignition system inoperative.
  • Poor idling
  • Restricted exhaust system.
  • Vacuum leak.
  • Burned valve(s).
  • INSPECT the valve(s).
  • Incorrect valve to valve seat contact.
  • INSPECT the valve and valve seat.
  • Head gasket damaged.
  • INSPECT the head gasket.
  • Fuel system damaged or inoperative.
  • Insufficient power
  • Compression leakage from valve seat.
  • INSPECT the valve or valve seat.
  • Valve sticking.
  • INSPECT valve stem to valve guide clearance or carbon accumulation.
  • Valve spring weak or broken.
  • INSPECT the valve spring.
  • Head gasket damaged.
  • INSPECT the head gasket.
  • Cylinder head cracked or distorted.
  • INSPECT the cylinder head.
  • Piston ring(s) worn, damaged or sticking.
  • INSTALL a new piston ring(s).
  • Piston worn or cracked.
  • INSTALL a new piston.
  • Fuel system damaged or inoperative.
  • Brakes dragging.
  • Tire size incorrect.
  • REFER to WHEELS AND TIRES .
  • Restricted exhaust system.
  • Excessive or insufficient compression
  • Valve(s) burnt or sticking.
  • INSPECT the valve(s).
  • Valve spring(s) weak or broken.
  • INSPECT the valve spring(s).
  • Worn piston.
  • INSTALL a new piston.
  • Piston ring(s) worn, damaged or sticking.
  • INSTALL a new piston ring(s).
  • Worn cylinder.
  • INSPECT and REPAIR the cylinder.
  • Head gasket damaged.
  • INSPECT the head gasket.
  • Carbon accumulation in combustion chamber.
  • ELIMINATE carbon buildup.
  • Fuel system damaged or malfunctioning.
  • Excessive oil consumption
  • Piston ring groove worn.
  • INSPECT the piston.
  • Piston ring sticking.
  • INSPECT the piston ring.
  • Piston or cylinder worn.
  • INSPECT the piston or cylinder block.
  • Valve stem seal worn or missing.
  • INSPECT the valve or valve stem seal.
  • Oil leakage.
  • REPAIR oil leakage.
  • Valve stem or valve guide worn
  • INSPECT the valve stem or valve guide.
  • Incorrect oil viscosity.
  • DRAIN and FILL with new oil.
  • Diluted oil.
  • CHECK oil for dilution. DRAIN and FILL as necessary.
  • Crankcase overfilled.
  • CHECK and adjust the oil level.
  • Incorrect oil pressure.
  • CHECK the oil pressure. REPAIR as necessary.
  • Broken piston, pin or piston ring.
  • INSTALL a new piston, pin or piston ring.
  • Oil baffle damaged inside of valve cover.
  • INSTALL a new valve cover.
  • Oil separator damaged.
  • INSTALL a new oil separator.
  • Engine noise
  • Excessive crankshaft main bearing clearance.
  • INSPECT the oil clearance. INSTALL a new crankshaft main bearings or REPAIR crankshaft.
  • Crankshaft main bearing heat damaged.
  • INSPECT the crankshaft main bearings. INSTALL new crankshaft main bearings or REPAIR crankshaft.
  • Excessive crankshaft end play.
  • INSPECT the crankshaft and crankshaft main thrust bearing.
  • Excessive connecting rod bearing oil clearance.
  • INSPECT the oil clearance. INSTALL new connecting rod bearings and/or REPAIR the crankshaft.
  • Connecting rod bearings heat damaged.
  • INSPECT the connecting rod bearings. INSTALL new connecting rod bearings and/or REPAIR the crankshaft.
  • Cylinder worn.
  • INSPECT the cylinder block.
  • Piston or piston pin worn.
  • INSPECT the piston or piston pin.
  • Piston ring damaged.
  • INSPECT the piston ring.
  • Connecting rod bent.
  • INSPECT the connecting rod.
  • Valve spring(s) broken.
  • INSPECT the valve spring(s).
  • Excessive valve guide clearance.
  • INSPECT the valve guide or valve.
  • Cooling system inoperative (water pump, vibration of radiator).
  • Fuel system inoperative.
  • Excessive carbon buildup.
  • ELIMINATE carbon buildup.
  • Exhaust gas leakage.
  • Incorrect drive belt tension.
  • Generator front bearing worn.
  • Tappet noise when engine is started (does not continue for more than 10 minutes)
  • Insufficient oil in engine.
  • CHECK the engine oil level. ADD oil as necessary.
  • Deteriorated oil.
  • DRAIN and FILL with new oil.
  • Insufficient oil in valve tappet.
  • WARM the engine. DRIVE vehicle at 3000 RPM for 8 minutes.
  • Tappet noise when engine is started (continues for more than 10 minutes)
  • Insufficient oil in engine.
  • CHECK the engine oil level. ADD oil as necessary.
  • Deteriorated oil.
  • DRAIN and FILL with new oil.
  • Tappet noise engine operation
  • Insufficient oil in engine.
  • CHECK the engine oil level. ADD oil as necessary.
  • Deteriorated oil.
  • DRAIN and FILL with new oil.
  • Insufficient oil pressure.
  • CHECK the oil pressure.
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