15.8. CARBURETTOR

This is necessary when the carburettor is not working properly because of dirt or in case false air is sucked in somewhere. This can be noticed if the engine backfires in the exhaust system during a cold start. The carburettor can be cleaned using paint thinner and an air gun. A set of clean nozzles in the carburettor ensures the engine is running properly.
If your car is equipped with an acceleration pump on the carburettor, you can easily check if the pump is still working properly. Move the throttle on the carburettor and check if engine is (visibly) sprayed into the carburettor, the faster you move the throttle, the faster gasoline should be sprayed into the carburettor.

- Remove the air filter and the rubber junction on the carburettor.
- Remove the fuel pipe
- Loosen the throttle and choke cable.
- Unscrew the four fixing nuts of the carburettor. This is not easy as these are hard to reach with a wrench. Therefore the oil filler pipe and the acceleration pump (see figure 3C.3 no. 9) must often be removed from the carburettor.
- Take the carburettor off the manifold.
- Thoroughly clean the carburettor on the outside.
- All nozzles can best be removed one by one and cleaned. This is best done by blowing them through using compressed air. The float chamber can be cleaned using a cloth and can then be blown clean. Take care of splashing fuel spatters and by all means you should do this away from open fire or cigarettes.
- Check the floater height as described in 3C.10.
- Check for past leakage along the thick gasket. This is indicated by the black traces along the edge. In case of leakage, you can install two thin gaskets at the upper and lower side of the gasket.
- Build in the carburettor, in reverse order of removing.
- Adjust the carburettor to the stationary rpm and possibly the CO percentage. (see C11)
Sometimes you only need to clean the carburettor internally. In that case it’s enough to remove the cover by unscrewing the six screws. Then the cover can be carefully removed, but take care not to damage the gasket, this should remain attached to the cover. Sometimes it sticks to the lower part and you should remove it using a stripping knife or something similar. When installing please take care to tighten the screws evenly and not too tight, the aluminium carburettor is easily damaged.

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