1982 3CX White Cab Perkins: unknown component on intake manifold

[ErwinPWP]

Hi All,

I’m busy with fixing some electrical problems on my 3CX 1982 White cab (Perkins 4.236).

I discovered a component on the engine intake manifold from which I don’t know the function.
The component is screwed into the manifold (in the elbow, just below the thermo start glow plug).
It’s a flat dish-shaped component with one electrical wire.



It could be a vacuum switch?
Does anybody know what it is and to which system it is connected?


BR,

Erwin

[essexpete]

Diaphragm sensor for air filter blockage. Mind you in my limited experience the filter has got to be fairly well blocked before that will put a light on. If you short the wires together you should see a yellow light on the dash.

[ErwinPWP]

OK thanks, I was also thinking into that direction.

My sensor is cracked on the bottom side so I think he will not work anymore. But it is no vital component so I will not exchange it.
Indeed if the engine has to suck this sensor to a active state there will be already a lot of black smoke coming out of the exhaust pipe!