Carb help

[elvimto]

I just removed the choke assembly or cold start as they also call it I had fuel leaking from between the shaft and body it which I thought required a seal but it does not it is just a bushing. My other question is in this picture where you can see the pointer is. This is the locating screw hole for the choke assembly and I had fuel coming out when I picked up the carb should that be the case or do I have a bigger problem with the carb.
Thanks Stuart

[sujitroy]

Stuart, I have a carb set I'm working on my bench. I'm not at home, but I recall that hole is blind so you shouldn't see fuel coming out of that hole. The hole at about 1pm has a hole all the way through.

I can check tonight.
Here's something I got from another Triumph list. I was inquiring about the gaskets for cold start state side. This may help with your shaft.

On the TR6 carbs the metering disc (choke thingy) is spring loaded and will push into the choke body when assembled to the carb body. In this way, the disc applies constant pressure against the body. When the chock is disengaged the fuel source is blocked off but the disc. When the engine is off the port is above the float bowl level. When it is running there is a slight depression at that point. This combination means there is very little seepage even without the gasket.

Sujit

[sujitroy]

just got home. the hole goes through. so tighten it or if u have a gasket change it. fuel can come out of tat hole

[elvimto]

Thanks for the reply, I did see some of the questions you posted in regards to carbs. I will post some more pics. The bushing to shaft clearance is about .0003 thou which may be on the high side fir a small shaft I am possibly going to have to replace the bushing in the choke assembly depending on what is available.I also have that information from the TR6 listing. You used to be on the USA forum site did you not you live up in N Cal. cheers

[sujitroy]

Cupertino , California. the stag digest was great. Lots of international stag owners on that free forum

[elvimto]

20180727_112513.jpg

[elvimto]

Just pulled this last night and removed the choke measured the bore and shaft of the choke assembly, shaft is .3125 and the bushing bore is .317 thou. This is possibly to much clearance so right now I am looking at replacing the bushing the o/d of the bushing is about .412 so I might have to make one.

[sujitroy]

I'm assuming it only leaks when car on choke. the disk is spring loaded and when on no choke the holes in the disk are blocked. so no fuel leak.

[elvimto]

I had to choke on to start ran up the street with the choke off then about 1/2 mile the car was not running great like it was getting fuel then spluttering so I stopped to look under the hood and then that's when I saw the fuel leak, went straight back to the house it was still leaking when I shut down. I need to look into it and I have contacted Burlen/Zenith and will follow up with them.
Cheers

[elvimto]

I made a bushing at work and went 5/16 or 0.313 bore which did make a lot of difference. It's now back on the carb waiting installation I am going to try this before I go changing seals etc. When you change to many parts at one time sometimes you never know what caused the problem in the first place.....

[elvimto]

I wondered how the choke assembly worked you can see that it is two plates which have been assembled and then the shaft is staked. The clip then sets the tension with the spring. In this case the shaft was good at 0.3125 but the bushing was worn the latter I replaced. The outside dia is 0.414 which i pressed in and put some Loctite green compound to hold it. I also had to cut a very fiddly gasket. The holes are very small and are different sizes.