PIAGGIO NRG POWER PUREJET, Workshop Manual, Page: 97 / 248

Refitting the crankshaft
- Place the transmission side crankcase half on
two wooden supports.
- Refit the water pump rotor (note that the thread-
ing is anticlockwise)
- Use the thermal gun to heat the bearing seat to
approx. 120°.
N.B.
MAKE SURE THAT THERE IS THE NECESSA-
RY SPACE IN THE LOWER SIDE TO INSERT
THE CRANKSHAFT
.
- Insert the crankshaft using a firm movement until
the bearing reaches home.
N.B.
CHECK THAT THE CONNECTING ROD IS
PLACED ACCORDING TO THE CYLINDER AX-
IS. IF ASSEMBLY IS UNSUCCESSFUL, START
OVER FOLLOWING THE HEATING RULES
AND BEING CAREFUL TO THE SHAFT INSER-
TION MOVEMENT. DO NOT LUBRICATE THE
SHAFT SINCE THE CRANKCASE HALF FIT-
TING SURFACES MAY BE SOILED.
- Let the crankcase half temperature settle with the
crankshaft temperature.
- Install the specific crankcase separation plate
again without installing the crankshaft guard.
- Keep the central thrust screw loosened during
assembly.
- Move the 4 fixing screws to the end of stroke and
loosen them again by the same angle (e.g. 90°)
- When temperature has settled, pre-load the
thrust screw of the tool manually until the bearing
ball backlash is zeroed.
N.B.
AN EXCESSIVE PRE-LOAD MAY CHANGE THE
CRANKCASE BEARING POSITION
.
NRG Power Purejet
Engine
ENG - 33