Ray Mahony Posted July 13, 2021 Share Posted July 13, 2021 I have, probably very foolishly, dismantled my carburettor to clean it. Now I find I have no idea how to set the metering pin and rack. Can someone explain how to do the initial metering pin set up on the Stewart Carburettor? Link to comment Share on other sites More sharing options...
Minibago Posted July 13, 2021 Share Posted July 13, 2021 This was posted on this forum previously but the author’s name escapes me. My apologies. I hope it is useful for you. The fine adjustment enriches the mixture when turned clockwise and leans the mixture off when turned anti clockwise. 1 Link to comment Share on other sites More sharing options...
stakeside Posted July 14, 2021 Share Posted July 14, 2021 On 7/13/2021 at 2:51 AM, Ray Mahony said: I have, probably very foolishly, dismantled my carburettor to clean it. Now I find I have no idea how to set the metering pin and rack. Can someone explain how to do the initial metering pin set up on the Stewart Carburettor? What is the carb used on and what model is it? Post some pictures. Link to comment Share on other sites More sharing options...
Ron Lawson Posted July 14, 2021 Share Posted July 14, 2021 Its off a 1915 DB Roadster 1 Link to comment Share on other sites More sharing options...
nearchoclatetown Posted July 15, 2021 Share Posted July 15, 2021 Does it run? If so determine if rich or lean, black smoke or popping. Take the bellcrank off and go ONE click on the spline THAT way. If it gets worse go the other way TWO clicks. When it gets close fine tune with the adjustment. 1 Link to comment Share on other sites More sharing options...
Ray Mahony Posted July 15, 2021 Author Share Posted July 15, 2021 I tried my best to follow the instructions given by "MINIBAGO". Quite tricky. could still not get it to fire up unless I put fuel in the pet cocks. I have now fitted another carb and got it to fire up but not run. What fun, what fun. Link to comment Share on other sites More sharing options...
Minibago Posted July 15, 2021 Share Posted July 15, 2021 Do you have fuel in the bowl? Is the float at the correct level? 1 Link to comment Share on other sites More sharing options...
Minibago Posted July 15, 2021 Share Posted July 15, 2021 If you have removed the carburettor and the vacuum tank is empty it is helpful to prime the system manually by filling the fuel bowl in the carburettor. This will usually be enough to get the car started and a minute or two of running will provide enough vacuum to fill the vacuum tank. Apologies if this has already been done. 1 Link to comment Share on other sites More sharing options...
Minibago Posted July 15, 2021 Share Posted July 15, 2021 Hopefully this illustrated parts breakdown and instructions will help. Follow the directions as written in the Stewart instructions booklet issued by the Detroit lubricator company. Good luck. 2 Link to comment Share on other sites More sharing options...
Ray Mahony Posted July 15, 2021 Author Share Posted July 15, 2021 At the moment the car has an electric fuel pump fitted so there is no problem with fuel supply. I will study the diagram and notes and see what I can achieve. Thanks everyone s for your comments so far. Link to comment Share on other sites More sharing options...
Mattml430 Posted July 15, 2021 Share Posted July 15, 2021 4 hours ago, Minibago said: Hopefully this illustrated parts breakdown and instructions will help. Follow the directions as written in the Stewart instructions booklet issued by the Detroit lubricator company. Good luck. Thanks I think this will help me also with the 1918 when I get to all the engine trouble shooting. Link to comment Share on other sites More sharing options...
Minibago Posted July 15, 2021 Share Posted July 15, 2021 That is why we are on here, all of us, to share our knowledge, our experiences and our information. (Remember we are not always right) Some of you have skills that we can only dream of, some have had “this problem” before. We help, we share so that all can have a car as good as we can afford to get it. 2 Link to comment Share on other sites More sharing options...
stakeside Posted July 15, 2021 Share Posted July 15, 2021 Great source of information on this forum but it may best to have it rebuilt. Especially if you intent to do tours. I decided to pay up and have it rebuilt. I believe Meyers Parts is still rebuilding them. My Stewart runs great. Link to comment Share on other sites More sharing options...
DB26 Posted July 15, 2021 Share Posted July 15, 2021 Here’s some information I have saved on the subject: 2 Link to comment Share on other sites More sharing options...
serf2 Posted August 17, 2023 Share Posted August 17, 2023 Hi all! I came across the above post and what a resource of information. I have this DB carb that is off of my 1929 Dodge. It looks very close to the above diagram but it has what looks like to me as some type of accelerator pump and on the end of the throttle shaft it has an eccentric that pushes down on a pin at full throttle. Were these just an approvement to the earlier version or is this basically just a different design? Thanks Mark Link to comment Share on other sites More sharing options...
Mark Gregush Posted August 17, 2023 Share Posted August 17, 2023 3 hours ago, serf2 said: Hi all! I came across the above post and what a resource of information. I have this DB carb that is off of my 1929 Dodge. It looks very close to the above diagram but it has what looks like to me as some type of accelerator pump and on the end of the throttle shaft it has an eccentric that pushes down on a pin at full throttle. Were these just an approvement to the earlier version or is this basically just a different design? Thanks Mark Might want to start a new topic instead of coming in on the end of an 2 year old one, this question is outside the scope of the original post. (It's not a pump, it's a valve that allows more or less fuel flow depending on if it is open or closed.) Link to comment Share on other sites More sharing options...
stakeside Posted August 18, 2023 Share Posted August 18, 2023 This is my carb. Great carb if set up correctly. post a picture of the top of your carb. Link to comment Share on other sites More sharing options...
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