the valve opens and the depression is suddenly
set to zero.
Lack of tightness or the fact that the valve opens
at different vacuum values should be regarded as
anomalies. In this case, replace it.
N.B.
LACK OF TIGHTNESS IN THE CUT-OFF VALVE RESULTS
IN EXHAUST NOISE (EXPLOSIONS IN THE MUFFLER). IN-
CORRECT CUT-OFF VALVE CALIBRATION CAN RESULT
IN CATALYTIC CONVERTER MALFUNCTIONING
N.B.
A FAULTY CUT-OFF VALVE DIAPHRAGM, BESIDES
JEOPARDISING THE CORRECT OPERATION OF THE
CUT-OFF VALVE, ALSO DAMAGES IDLE FUNCTIONING
Specific tooling
020329Y MityVac vacuum-operated pump
Fuel supply
- To clean the filtering element proceed as follows:
remove the 4 filter cover fixing screws indicated in
the figure; remove the cover and take out the pa-
per filtering element, clean with compressed air
and refit.
- Make sure the filtering element is in the correct
position.
- Check that the air passage sections are not dam-
aged or deformed.
- Check the correct sealing of the coupling be-
tween the filter housing and the cover.
N.B.
FAILURE TO OBSERVE THESE INSTRUCTIONS MAY RE-
SULT IN WRONG VACUUM INSIDE THE FILTER HOUSING,
WHICH IN TURN MAY PRODUCE VARIATIONS IN CARBU-
RETION.
Engine Carnaby 125 - 200
ENG - 172
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