1F-3 Power Unit Cooling System:
Diagnostic Information and Procedures
Powerhead Cooling System Diagnosis
ZAJ6111604001
Service Instructions
Thermostat Removal and Installation
ZAJ6111606001
Removal
1) Unfasten the cable tie (1).
2) Loosen the clip (2) and remove the water return
hose (3) from thermostat cover (4).
3) Remove the two bolts (5) securing the thermostat
cover (4), then remove the cover.
4) Remove the thermostat (6).
Installation
Installation is reverse order of removal with special
attention to the following steps.
• Assemble thermostat (1) and thermostat cover (2) to
cylinder block and secure with the bolts (3).
Tightening torque
Thermostat cover bolt (a): 10 N·m (1.0 kgf-m, 7.2
lbf-ft)
Condition Possible cause Correction / Reference Item
Overheating powerhead Water inlet screen obstructed. Clean.
Water passage obstructed. Clean or replace.
Pump plate not sealing. Check and repair.
Water pump impeller damage. Replace.
Water pump housing and/or plate worn. Replace.
Water pump housing seal worn. Replace.
Water tube grommet damaged. Replace.
Thermostat damaged / defective. Replace.
Water pressure valve damaged /
defective.
Replace.
Water tube obstructed. Clean.
Water tube defective. Replace.
Overcooling powerhead Thermostat damaged / defective. Replace.
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