N.B.
DO NOT LUBRICATE THE O-RING. FAILURE TO RESPECT
THIS RULE RESULTS IN RING DISTORTION.
Specific tooling
020440Y Water pump service tool
Locking torques (N*m)
Water pump rotor cover 3 ÷ 4
Water pump ceramic seal
Our Leader, Quasar, and Master liquid cooled engines are equipped with water pumps fitted with the
ceramic seal in the subject. This component is intended to guarantee the leak tightness of the coolant
in relation to the pump shaft. The seal achieved via two special ceramics, a static one and a spinning
one, kept in contact by the thrust of a spring, coaxially mounted onto the pump shaft. The efficiency of
this system is guaranteed by the accurate machining and cleaning of the components as they are fitted;
in any case, ceramic seals are subjected to a running in period. During this period (1,000 ± 1,500 km),
there may be small leaks through draining holes, which remain visible on the aluminium crankcase.
This phenomenon is particularly visible there where the hole is more exposed (Quasar and Master). In
Runner 125 - 200 Cooling system
COOL SYS - 261
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