Emission control components - removal and refitting
Spark delay/sustain valve
1 Disconnect the vacuum lines at the valve and remove the valve from the engine.
2 When refitting a spark delay valve it must be positioned with the black side (marked CARB) towards the carburettor and the coloured side (marked DIST) towards the distributor. When refitting a spark sustain valve the side marked VAC must be towards the carburettor and the side marked DIST towards the distributor.
Spark sustain valve is marked for direction of fitting
A to PVS B to distributor
Ported vacuum switch
3 Remove the filler cap from the expansion tank to reduce pressure in the cooling system. If the engine is hot, remove the cap slowly using a rag to prevent scalding.
4 Disconnect the vacuum lines and, if necessary, the water hoses, then unscrew the valve from the inlet manifold or adapter.
5 When refitting the valve, note that the vacuum line from the carburettor is connected to the middle outlet on the PVS, the vacuum line from the spark delay valve (where fitted) is connected to the outlet nearest to the threaded end of the PVS, and the vacuum line from the spark sustain valve is connected to the outlet furthest from the threaded end of the PVS.
6 Reconnect the water hoses and, if necessary, top-up the cooling system.
Fuel trap
7 Disconnect the vacuum lines and remove the fuel trap from the engine.
8 When refitting, make sure that the fuel trap is positioned with the black side (marked CARB) towards the carburettor and the white side (marked DIST) towards the PVS.
Fuel trap is marked for direction of fitting