- Remove the blow-by reed valve with the relevant
sealing gasket.
- Unscrew the fastening screw and remove the gas
outlet union with the relevant O-ring.
- Check that the mounting surface of the crankcase
is not worn or deformed.
- Check that the by-pass valve seat, the torque
limiter and the water pump shaft are free from
wear.
Characteristic
By-pass housing hole diameter:
13.9 mm
Connection diameter for start-up gear shaft:
12 mm
Connection diameter for pump shaft:
8 mm
- Check that the oil filter union and matching sur-
face exhibit no deformations or wear.
Engine MP3 400 i.e.
ENG - 30
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