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Safety valve check
The cleaning of the canister is achieved via a controlled flow of air from the vacuum socket in the intake
manifold.
To ensure that the engine works properly, it is necessary that the flow of air is not too intense, this is
achieved by means of a restricted section 0.0354in (0.9 mm) formed in the socket on the intake manifold.
The relative connecting pipe with the canister, includes the installation of the safety valve.
This is a one-way valve which ensures the passage of air in the direction of the manifold when the
control vacuum is greater than 2.9PSI (20kPa) (200mbar).
The vacuum of the engine at idle, causes a slight flow of air easily compensated by the idle speed
adjustment parameters.
When the vehicle is stopped, the safety valve will be closed due to the lack of control vacuum therefore,
any expansion of the fuel tank, will not cause pollution of the intake manifold, and then cause flooding
of the engine.
To control the valve, it is preferable to it, alterna-
tively just access the manifold side pipe.
•
Connect the MITY-VAC pump on the
engine side duct.
•
Select the pump command on the "vac-
uum" position, then slowly apply vac-
uum up to the valve threshold check
opening.
If you detect different pressures, replace the valve.
N.B.
An opening vacuum that is too high, causes
a lack of regeneration of the activated carbon; vice
versa, an opening vacuum that is too low, increa-
ses the flow of air to the engine causing the thin-
ning of idle.
Characteristic
Standard opening vacuum
(2.90-3.77)PSI (20-26)kPa (200-260)mbar
Roll-over valve check
The valve must enable the following results:
•
Aeration of the tank while riding (the ambient air enters the tank in relation to the volume of
fuel used).
Vespa Primavera125 - 150 i.e. 3Valvole (2013)
Maintenance
MAIN - 49
Содержание 150
Страница 1: ...SERVICE STATION MANUAL 1Q000118 EN Vespa Primavera125 150 i e 3Valvole 2013 ...
Страница 4: ......
Страница 6: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Страница 27: ...INDEX OF TOPICS TOOLING TOOL ...
Страница 37: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Страница 51: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Страница 55: ...Vespa Primavera125 150 i e 3Valvole 2013 Troubleshooting TROUBL 55 ...
Страница 56: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Страница 117: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Страница 123: ...INDEX OF TOPICS ENGINE ENG ...
Страница 182: ...INDEX OF TOPICS INJECTION INJEC ...
Страница 203: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Страница 222: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Страница 229: ...INDEX OF TOPICS CHASSIS CHAS ...
Страница 244: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Страница 249: ...Transmission 10 53 124 136 Turn indicators 79 Tyres 11 V Vehicle 8 118 119 ...