![]() To remove the air valve assembly take off the top cover by undoing the screws 2 when the assembly with diaphragm can be lifted out of the main body. Not least (as explained in the training manual) because improper adjustment may impair the proper set-up and function of the by-pass valve.Sticking of the air valve can be explained by dirt or carbon on the outside diameter of the air valve and the bore in which the air valve moves or if the metering needle is bent. I know that the main reason for fitting was the control of emission, but proper adjustment does matter. ![]() It is the device which controls the fuel air mixture on over-run or decelleration and therfore affects engine braking.Īs to the detail, it seemed to me that it was worthwhile exploring and explaining the purpose of the valve and its adjustment. So I have used one of the correct names and as Martin says it is to be found on just about every 175 CD2. It purpose is to direct the vapour from the float chamber either into the vent tube (on UK cars going to the air filter or on USA cars to the activated carbon canister) which shoudl occur when the engine is on tick over, or back into the carburetor via internal channels when the engine is running above tick over. The valve I was talking about is indeed the "Float chamber ventilation valve' which is a very informative name, but is is also called the Vent valve for short (eg. I think that you have now added to the confusion. Hope all this stuff will also be jelpful to others. Even so the car now feels competiton which it never did before. Now I guess all I have to do is to get the mixture setting on both carbs in good balance. Anyway, I had no problem using hot water and a thermistor to set the opening of both compensators at 20 C. ![]() The specification for the compensators also mentions that the neoprene cones that closes the orifice when cold has a taper of 120 degrees which is probably where the erroneous figure of 120 crept in. Burlen state the temperature of opening should be 20 C(68 F). Now re the temperature compensators, I realise the figures for opening temperature that are given in are almost certainly wrong (namely about 120 F). ![]() Well so far I have not said a word, but will try to add a brief paragraph on where the valve is, what it is for and how to adjust (all courtesy of the training guide mentioned above) in due course. ![]()
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