Radiator (Cooling System) - Suzuki AN400 Service Manual

9-8 SERVICING INFORMATION
Complaint
Engine overheats.
Dirty or heavy
exhaust smoke.
Slipping clutch.

RADIATOR (COOLING SYSTEM)

Complaint
Engine overheats.
Engine overcools.
Symptom and possible causes
Defective engine internal parts
1. Heavy carbon deposit on piston crowns.
2. Not enough oil in the engine.
3. Defective oil pump or clogged oil circuit.
4. Sucking air from intake pipe.
5. Use of incorrect engine oil.
6. Defective cooling system.
Lean fuel/air mixture
1. Short-circuited intake air pressure sensor/lead wire.
2. Short-circuited intake air temperature sensor/lead wire.
3. Sucking air from intake pipe joint.
4. Defective fuel injector.
5. Defective engine coolant temperature sensor.
The other factors
1. Ignition timing too advanced due to defective tim-
ing advance system(engine coolant temperature
sensor, crankshaft position sensor and ECM.)
1. Too much engine oil in the engine.
2. Worn piston rings or cylinder.
3. Worn valve guides.
4. Scored or scuffed cylinder walls.
5. Worn valves stems.
6. Defective stem seals.
7. Worn oil ring side rails.
1. Worn clutch shoe.
2. Centrifugal weight not working.
Symptom and possible causes
1. Not enough engine coolant.
2. Radiator core clogged with dirt or scale.
3. Defective cooling fan.
4. Defective cooling fan thermo-switch.
5. Clogged water passage.
6. Air trapped in the cooling circuit.
7. Defective water pump.
8. Use of incorrect engine coolant.
9. Defective thermostat.
1. Defective cooling fan thermo-switch.
2. Extremely cold weather.
3. Defective thermostat.
Remedy
Clean.
Add oil.
Replace or clean.
Retighten or replace.
Change.
Consult radiator section.
Repair or replace.
Repair or replace.
Repair or replace.
Replace.
Replace.
Replace.
Check with inspection win-
dow. Drain excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replaie or replace.
Remedy
Add engine coolant.
Clean.
Repair or replace.
Replace.
Clean.
Bleed air.
Replace.
Replace.
Replace.
Replace.
Put on radiator cover.
Replace.