29
Troubleshooting
Problem: Engine will not start or is hard to start
Condition
Remedy
1.
Battery
discharged or defective
2.
Carbon build-up in combustion chamber
excessive
3.
Gasoline
bad - contaminated
4.
Valve clearance
out of adjustment
5.
Valve guides
worn
6.
Valve timing
incorrect
7.
Piston rings
worn excessively
8.
Cylinder
bore worn
9.
Starter motor
cranks too slowly - does not turn
1. Test, charge, and/or replace battery
2. Run combustion chamber cleaner or clean combustion chamber
3. Drain gas - replace with clean gas
4. Adjust clearance
5. Replace guides
6. Check/set valve timing
7. Replace rings
8. Replace cylinder
9. See Electrical System- Troubleshooting
Problem: Engine will not start or is hard to start (No spark)
Condition
Remedy
1.
Battery
discharged or defective
2.
Spark plug
fouled
3.
Spark plug
wet
4.
Magneto
defective
5.
ECM
defective
6.
Ignition coil
defective
7.
High-tension lead open
- shorted
1. Test, charge, and/or replace battery
2. Clean - replace plug
3. Clean - dry plug
4. Replace stator coil
5. Replace ECM
6. Replace ignition coil
7. Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the fuel injector)
Condition
Remedy
1.
Gas tank vent hose
obstructed
2.
Fuel hose
obstructed
3.
Fuel screens
obstructed
4.
Fuel pump
defective
1. Clean vent hose
2. Clean - replace hose
3. Clean
4. Replace fuel pump
Problem: Engine stalls easily
Condition
Remedy
1.
Gasoline
bad - contaminated
2.
Spark plug
fouled
3.
Magneto
defective
4.
ECM
defective
5.
Fuel injector
obstructed
6.
Valve clearance
out of adjustment
1. Drain gas - replace with clean gas
2. Clean plug
3. Replace magneto
4. Replace ECM
5. Replace fuel injector
6. Adjust clearance
Problem: Engine noisy (Excessive valve chatter)
Condition
Remedy
1.
Valve clearance
too large
2.
Valve spring(s)
weak - broken
3.
Rocker arm - rocker arm shaft
worn
4.
Camshaft
worn
5.
Valve tappets
worn
1. Adjust clearance
2. Replace spring(s)
3. Replace arm - shaft
4. Replace camshaft
5. Replace tappets
Problem: Engine noisy (Noise seems to come from piston)
Condition
Remedy
1.
Piston - cylinder
worn
2.
Combustion chamber
carbon buildup
3.
Piston pin - piston pin bore
worn
4.
Piston rings - ring groove(s)
worn
1. Replace - service piston - cylinder
2. Clean cylinder head and piston
3. Replace - service pin - bore
4. Replace rings - piston
Problem: Engine noisy (Noise seems to come from timing chain)
Condition
Remedy
1.
Chain
worn
2.
Sprockets
worn
3.
Tension adjuster
malfunctioning
1. Replace chain
2. Replace sprockets
3. Repair - replace adjuster
Problem: Engine noisy (Noise seems to come from crankshaft)
Condition
Remedy
1.
Main bearings
worn - burned
2.
Lower rod-end bearing
worn - burned
3.
Connecting rod side clearance
too large
1. Replace bearing(s)
2. Replace crankshaft assembly
3. Replace crankshaft assembly
Problem: Engine noisy (Noise seems to come from transmission)
Condition
Remedy
1.
Gears
worn
2.
Splines
worn
3.
Primary gears
worn
4.
Bearings
worn
5.
Bushing
worn
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing
Summary of Contents for 2016 Alterra 500
Page 1: ...www arcticcat com SERVICE MANUAL www arcticcat com ...
Page 170: ...169 NOTES ...