Honda CBR650F Service Manual page 175

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COOLING SYSTEM
SERVICE INFORMATION
COOLING SYSTEM
GENERAL
Removing the radiator cap while the engine is hot can allow the coolant to spray out, seriously scalding you.
Always let the engine and radiator cool down before removing the radiator cap.
Except TH model:
• Using coolant with silicate corrosion inhibitors may cause premature wear of water pump seals or blockage of radiator
passages. Using tap water may cause engine damage.
TH model:
• Use only genuine Honda PRE-MIX COOLANT containing corrosion inhibitors, specifically recommended for aluminium engines
when adding or replacing the coolant.
Genuine Honda PRE-MIX COOLANT is excellent at preventing corrosion and overheating. The effects last for up to 2 years.
• The coolant should be inspected and replaced properly by following the maintenance schedule.
• Use any genuine Honda PRE-MIX COOLANT without diluting with water.
• DO NOT use non-ethylene glycol coolant, tap water, nor mineral water when adding or replacing the coolant.
Use of improper coolant may cause damage, such as corrosion in the engine, blockage of the cooling passage or the radiator
and premature wear of the water pump seal.
• Add cooling system at the reserve tank. Do not remove the radiator cap except to refill or drain the system.
• All cooling system services can be done with the engine in the frame.
• Avoid spilling coolant on painted surfaces.
• After servicing the system, check for leaks with a cooling system tester.
• For high coolant temperature indicator/ECT sensor inspection (page 21-12).
• For fan control relay inspection (page 21-24).
TROUBLESHOOTING
Engine temperature too high
• Faulty high coolant temperature indicator or ECT sensor (page 21-12)
• Thermostat stuck closed
• Faulty radiator cap
• Insufficient coolant
• Passage blocked in radiator, hoses or water jacket
• Air in system
• Faulty cooling fan motor
• Faulty fan control relay (page 21-24)
• Faulty water pump
Engine temperature too low
• Faulty high coolant temperature indicator or ECT sensor (page 21-12)
• Thermostat stuck open
• Faulty fan control relay
Coolant leak
• Faulty water pump mechanical seal
• Deteriorated O-rings
• Faulty radiator cap
• Damaged or deteriorated cylinder head gasket
• Loose hose connection or clamp
• Damaged or deteriorated hose
• Damaged radiator
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