- Remove the central screw with Belleville washer,
as shown in the diagram.
- Remove the chain with the pulley.
- Remove the crankshaft control pinion.
- Remove the oil pump acting on the 2 retainers as
shown in the figure.
- Remove the oil pump seal.
IT IS ADVISABLE TO MARK THE CHAIN IN OR-
DER TO ENSURE THAT THE INITIAL DIREC-
TION OF ROTATION IS MAINTAINED.
Inspection
- Remove the two screws and the oil pump cover.
- Remove the clip retaining the innermost rotor.
- Remove and wash the rotors thoroughly with pet-
rol and compressed air.
- Reassemble the rotors in the pump body, keep-
ing the two reference marks visible Replace the
clip.
- Using a thickness gauge, check the distance be-
tween the rotors in the position shown in the figure.
Characteristic
Maximum clearance admitted
0.12 mm
Engine Fly 125 - 150 4T
ENG - 136
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