PIAGGIO MP3 500 i.e. SPORT, Service Station Manual

Page: 398 / 432

CAUTION
THIS OPERATION MUST BE CARRIED OUT WHEN THE ENGINE IS COLD.
- Remove the water pump cover as indicated in the
figure by loosening the six fixing screws.
- Follow the instructions provided in the «Engine/
Water pump» chapter to inspect the pump.
- Refill and drain the system again once after hav-
ing repaired the damage and reinstalled all the
components.
N.B.
FOR CHANGING THE COOLANT AND BLEEDING THE
SYSTEM, SEE CHAPTER "COOLING SYSTEM".
Removing the water pump cover:
- Check that the water pump cover is not deformed
or dented.
- Check that the sealing O-ring is in good working
order.
- Otherwise, replace the component.
- Adequately fit a new O-ring, be careful to lubricate it with petroleum jelly grease.
N.B.
TO AVOID DEFORMATION, DO NOT LUBRICATE THE O-RING WITH PETROLEUM GREASE.
CAUTION
FAILURE TO OBSERVE THIS PRECAUTION WILL IRRETRIEVABLY DEFORM THE O-RING.
- Refit the water pump cover and tighten the 6 fixing screws to the prescribed torque.
N.B.
FOR CHANGING THE COOLANT AND BLEEDING THE SYSTEM, SEE THE "COOLANT CHANGE"
SECTION.
Locking torques (N*m)
Water pump cover screws 3 - 4
diagnosis
Excessive system pressure
1 - Check the expansion tank cap efficiency.
N.B.
THE CAP IS EQUIPPED WITH A PRESSURE-RELIEF VALVE CALIBRATED AT 0.9 BAR.
There is also a valve that must allow air inlet during the cooling step.
YES go to 2 NO go to 3
Cooling system
MP3 500 i.e. SPORT Business_LT_ ABS-ASR_EU_USA
(2015)
COOL SYS - 398