"SIEMENS" pneumatic flushing valve

When the key is turned to MARCIA the solenoid, normally open, is activated and closes to enable operation.

Solenoid (1), when excited, attracts plunger (2) that overcomes the load of disc spring (3) to close orifice (4) and prevent fuel vapour passing through

Solenoid adjusted so that the arrow on the case is turned toward the inlet manifold.

For turbo versions, the solenoid is specific as it is one-directional. If replaced, fit an equivalent solenoid.

"SIEMENS" pneumatic flushing valve

Foreword

The purpose of this valve is to allow recirculation of vapour and thus flushing of active carbon when the vapour control solenoid (Bosch) is inhibited and the inlet manifold is under pressure.

Operation

The valve is connected by pipes to three points.

Duct (A) is connected by fitting T to active carbon trap filter; duct (B) is connected to the turbocharger inlet duct; duct (C) is connected to the engine intake manifold.

The pressure set up in the inlet manifold reaches the valve through duct (C).

When this pressure exceeds a certain level when added to the vacuum set up in turn in the duct (B connected to the turbo inlet duct) it acts on membrane valve (D), to bring duct (A) into communication with duct (B).

Fuel vapours that reach the valve from duct (A) may be taken in through duct (B) from the turbocharger.

A - To three-way fitting (carbon filter)

B - To turbo inlet duct

C - To inlet manifold

D - Membrane valve

E - Yellow paint mark used as fitting reference