Linkert card throttle binding?

[TH47Indy]

I have professionally rebuilt linkert card for my '47 Cheif that has only been run on the engine stand after a complete rebuild and I was installing the throttle and advance cables.

After installing and adjusting the new cables, the throttle cable started to feel like it was binding, and was difficult to turn.
Thought it was something with the cable, but when I detached it from the carb I realized it was the carb that was causing the issue.

Removed the carb, and opening and closing by hand is now very difficult and seems to be getting worse.

There was no issue before this when it was off the engine, or after I installed it, it opened and closed perfectly.

I can't see anything externally that would be causing the issue.

What am I missing, or what could have caused the issue in the first place?

Thanks.

[T. Cotten]

I have professionally rebuilt linkert card for my '47 Cheif that has only been run on the engine stand after a complete rebuild and I was installing the throttle and advance cables.

After installing and adjusting the new cables, the throttle cable started to feel like it was binding, and was difficult to turn.
Thought it was something with the cable, but when I detached it from the carb I realized it was the carb that was causing the issue.

Removed the carb, and opening and closing by hand is now very difficult and seems to be getting worse.

There was no issue before this when it was off the engine, or after I installed it, it opened and closed perfectly.

I can't see anything externally that would be causing the issue.

What am I missing, or what could have caused the issue in the first place?

Thanks.

It is unusual for Indian and other 3-bolt manifolds, TH47Indy,...

But occasionally, binding is an issue for severely-overtorqued 4-bolt models.

(10 ft-lbs for 5/16" fasteners should do if both carb and manifold flanges are dressed 'flat', with 13 ft-lbs maximum before the flanges will deform.)

It would be best for your 'pro rebuilder' to take it all apart and inspect closely for abrasives or whatever...

....Cotten

[pisten-bully]

Possible that the screws holding the throttle disc are loose and the disc has moved and is binding up. I guess take the carb off and take a look there, and also at the throttle linkage on top to see if that has moved on the shaft.

[tfburke3]

Most likely would be the top manifold screw is to long.loosen the screw and see if it gets better.
Tom

[T. Cotten]

Most likely would be the top manifold screw is to long.loosen the screw and see if it gets better.
Tom

Good call, Tom!

Colony screws are slightly longer than Greer's.

It leaves a mark.

....Cotten

[TH47Indy]

Most likely would be the top manifold screw is to long.loosen the screw and see if it gets better.
Tom

Good idea, but I had the carb off and still the same issue, also checked the throttle disk screws and everything looks OK. Puzzeling because it was fine before off and on, and the issue started when I was connecting and adjusting the cable.

Carbs on the bench and took off the bellcrank but nothig seems out of place. It progressivly gets worse, so assuming maybe something in the bushing.

Thanks for all the quick responses, moving on to other tasks on the build and I'll run the carb by the builder next week.

[T. Cotten]

TH47Indy!

If the bushing has been crushed as Tom suggests, they often do not spring back.

Please let your rebuilder assess it, as "progressivly gets worse" sounds like foreign objects.

Glass beads are far too common, even though nobody ever knows where they came from. . ..

....Cotten

[TH47Indy]

I'm thinking your right about a foreign object, since it worked fine even when on the manaifold so I don't think the bushing was crushed.
I'll let you know what caused the issue as soon as it solved.

Thanks again to all for the help!

[TH47Indy]

Tom got it!
Looks like there was some galling or debris in the throttle shaft/bushing. A quick fix.
Thanks!