Overheating
1. Insufficient oil supply or oil not circulating.
2. Insufficient air flow over engine.
3. Heavy carbon deposit.
4. Ignition timing retarded due to faulty sensor(s): Manifold
Absolute Pressure (MAP) and/or Crank Position (CKP).
5. Leaking valve.
Valve Train Noise
1. Low oil pressure caused by oil feed pump not functioning
properly or oil passages obstructed.
2. Faulty hydraulic lifters.
3. Bent push rod(s).
4. Incorrect push rod length.
5. Rocker arm binding on shaft.
6. Valve sticking in guide.
7. Chain tensioner or shoe worn.
Excessive Vibration
1. Wheels and/or tires worn or damaged.
2. Engine/transmission/rear wheel not aligned properly.
3. Primary chain badly worn or links tight as a result of
insufficient lubrication or misalignment.
4. Engine to transmission mounting bolts loose.
5. Upper engine mounting bracket loose.
6. Ignition timing advanced due to faulty sensor inputs (MAP
and/or CKP)/poorly tuned engine.
7. Internal engine problem.
8. Broken frame.
Check Engine Light Illuminates During
Operation
Fault detected. For diagnostic information see the Electrical
Diagnostic Manual.
LUBRICATION SYSTEM
Oil Does Not Return To Oil Pan
1. Oil pan empty.
2. Oil pump not functioning.
3. Restricted oil lines or fittings.
4. Restricted oil filter.
5. Oil pump misaligned or in poor condition.
6. O-ring damaged or missing from oil pump/crankcase
junction (also results in poor engine performance).
Engine Uses Too Much Oil Or Smokes
Excessively
1. Oil pan overfilled.
2. Restricted oil return line to pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Oil pump misaligned or in poor condition.
6. Piston rings badly worn or broken.
7. Valve guides or seals worn.
8. O-ring damaged or missing from oil pump/crankcase
junction (also results in poor engine performance).
9. Plugged crankcase scavenge port.
Engine Leaks Oil From Cases, Push Rods,
Hoses, Etc.
1. Loose parts.
2. Imperfect seal at gaskets, push rod cover, washers, etc.
3. Restricted breather hose to air cleaner.
4. Restricted oil filter.
5. Oil pan overfilled.
6. Lower rocker housing gasket installed incorrectly (upside
down).
7. Restricted oil return line to tank.
Low Oil Pressure
1. Oil pan underfilled.
2. Faulty low oil pressure switch.
3. Oil pump O-ring damaged or missing.
4. Bypass valve stuck in open position.
5. Ball missing or leaking in cam support plate.
High Oil Pressure
1. Oil pan overfilled.
2. Bypass valve stuck in closed position.
ELECTRICAL SYSTEM
NOTE
For diagnostic information see the ELECTRICAL DIAGNOSTIC
MANUAL.
Alternator Does Not Charge
1. Voltage regulator module not grounded.
2. Engine ground wire loose or broken.
3. Faulty voltage regulator module.
4. Loose or broken wires in charging circuit.
5. Faulty stator and/or rotor.
Alternator Charge Rate Is Below Normal
1. Weak or damaged battery.
2. Loose connections.
3. Faulty voltage regulator module.
4. Faulty stator and/or rotor.
2008 Dyna Service: Maintenance 1-51
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