System Bleed; Water Pump - Overhaul - Gilera DNA 50 Workshop Manual

Cooling system

System bleed

1. Fill the circuit through the expansion tank to
the maximum level.
2. Fasten the rubber line to the drain fitting on
the head and thread it into the expansion
tank mouth..
3. Loosen the fitting and restore the tank level.
4. Start up the engine and wait until only cool-
ant exits from the line, then tighten the fitting
on the head..
5. Turn off the engine, restore the level of liquid
to the maximum level, then close the expan-
sion tank..
6. Heat up the engine to normal operating tem-
perature in order to eliminate any air forma-
tion in the main lines..
7. Stop the engine and let it cool, then check
that the level of coolant in the expansion tank
to the maximum;; refill it.

Water pump - overhaul

- Ensure the shaft is not abnormally worn and the
bearings not noisy. Otherwise, replace shaft and
bearings
- Carefully clean oil seal and bearing housings
COOL SYS - 108
DNA 50