Gilera DNA 50, Workshop Manual

Page: 111 / 170

- With the aid of the special tool, loosen the impel-
ler shaft turning the spanner clockwise (left-hand-
ed thread)
- As the thread is fully disengaged, extract the
shaft with the aid of pliers.
Specific tooling
020169Y Water pump crankshaft fitting and re-
moval spanner
- Using the special hook, remove the sealing ring from its housing as shown in the picture.
Specific tooling
020209Y Spring hook
Thermostat
Removal
•
Detach the coolant hose from the
head, partially draining the system.
•
Remove the cylinder head.
•
Remove the two fixing screws and
hence the thermostat.
Check
1) Visually check that the thermostat is not dam-
aged.
2) Fill a metallic container with approx. 1 litre of
water.
Immerge the thermostat, and keep it in the centre
of the bowl.
Immerge the multimeter temperature probe, and
keep it close to the thermostat.
Heat up the bowl using the thermal gun.
Check the thermostat opening start temperature:
Heat up until the thermostat is completely open.
DNA 50
Cooling system
COOL SYS - 111