Coolant Replacement - Gilera 633721 Workshop Manual

Nexus 500 euro 3
DO NOT USE OILS OR GREASES WHILE MOUNTING THE COOLING SYSTEM. FAILURE TO OB-
SERVE THIS REGULATION CAN CAUSE IRREVERSIBLE DEFORMATION TO THE SEALING
GASKETS.

Coolant replacement

System top-up instructions
- Prepare the mixture of 50% water and 50% cool-
ant.
- Fill the system to reach a level ranging between
the MIX and MAX levels indicated in the expansion
tank filler.
- Do not close the expansion tank with the cap.
- Use a transparent hose to connect the venting
union with the expansion tank filler.
- Loosen the vent and start the engine.
- Keep it open until the air has been fully vented.
- Close the bleed screw.
- Stop the engine.
- Restore the level into the expansion tank and tighten the cap.
- Start the engine and let it warm up to reach the electric ventilation temperature.
- Stop the engine.
- Restore the level with cold engine.
CAUTION
ELECTRIC VENTILATION IS CONTROLLED BY THE TEMPERATURE MEASURED AT THE HEAD.
THE ELECTRIC VENTILATION START DOES NOT MEAN THAT THE VENTING HAS BEEN COM-
PLETED.
VENTING IS COMPLETE WHEN THE EXPANSION TANK TEMPERATURE RISES.
Water pump - overhaul
- Carefully position a new O-Ring, avoiding contact with grease or oil.
CAUTION
FAILURE TO OBSERVE THIS ADVICE CAN IRRETRIEVABLY DEFORM THE O-RING.
Cooling system
COOL SYS - 331