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Throttle shaft repair
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lonesome mopar
Posted 2020-02-11 6:39 AM (#594056)
Subject: Throttle shaft repair



Extreme Veteran

Posts: 388
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Location: Milano, Italy

Hi gang,

my throttle won't return to idle as immediatly as it used to do.

The spring is new but the accelerator rod still does not seat  the shaft to the full idle position.

Just a few hudred rpm off idle.

To seat it back, I have to push it back with my finger. Then it's ok.

So I guessed the throttle shaft bushings must be worn out of round....

Does anybody know if the following throttle shaft bushing repair kit is suitable for my stock AFB Carter carburetor?

https://www.ebay.com/itm/Carburetor-5-16-Throttle-Shaft-Bushing-Repair-Kit-8-Bushings-16-Screws-Reamer/331997014383?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

 

I thank you for any hint.

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1960fury
Posted 2020-02-11 8:06 AM (#594059 - in reply to #594056)
Subject: Re: Throttle shaft repair



Expert 5K+

Posts: 6429
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Location: northern germany
??? If it is worn it usually gives free-play and is not binding. "New spring"? So not OE? Just install a OE or stronger spring or increase the tension!
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wizard
Posted 2020-02-11 8:21 AM (#594061 - in reply to #594056)
Subject: Re: Throttle shaft repair



Board Moderator & Exner Expert 10K+

Posts: 12154
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Location: Southern Sweden - Sturkö island
As Sid wrote - and normally, I rarely find a throttle shat that's so worn that it creates problems.

First of all, check the fulcrum bracket on the firewall - is that worn?
Secondly, check the throttle valve lever rubber bushing on the automatic transmission - is that worn or totally missing?
Thirdly, loosen the nut on the throttle valve rod adjustment and leave the nut off - do this get the engine back to normal idle rpm's?

It's very important that the throttle valve rod/lever is properly adjusted (presuming that you have an automatic transmission in this car?)
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1960fury
Posted 2020-02-11 9:07 AM (#594062 - in reply to #594056)
Subject: Re: Throttle shaft repair



Expert 5K+

Posts: 6429
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Location: northern germany
I have never seen a throttle shat that was so worn that the plate jams in the bore. Of course I was assuming the kick down linkage is adjusted properly. If it prevents curb idle, it must be so off that the transmission slips when shifting.

Edited by 1960fury 2020-02-11 9:08 AM
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lonesome mopar
Posted 2020-02-11 11:55 AM (#594069 - in reply to #594056)
Subject: Re: Throttle shaft repair



Extreme Veteran

Posts: 388
100100100252525
Location: Milano, Italy
Thanks for the hints.
all right I'll check the stuff you are saying and I will come back...

By the way it was working well, approx a month ago, then little by little it started to stick.
Linkage is free and oiled. Rubber bushing old but not worn out.... Kick down well registered...

Car is my '58 Belvie 318 w/super pack option
I will double check and report.
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lonesome mopar
Posted 2020-02-11 11:59 AM (#594070 - in reply to #594056)
Subject: Re: Throttle shaft repair



Extreme Veteran

Posts: 388
100100100252525
Location: Milano, Italy
The return spring is a replacement for stock 4 barrel carb, bought from summitracing.com
It worked fine for several months.
I do not believe it has lost its energy. It is quite strong - no need a stronger one or my foot will ache at highway speed.
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wizard
Posted 2020-02-11 2:47 PM (#594081 - in reply to #594056)
Subject: Re: Throttle shaft repair



Board Moderator & Exner Expert 10K+

Posts: 12154
5000500020001002525
Location: Southern Sweden - Sturkö island
Check the heat riser and choke valve movements as next step...
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60 dart
Posted 2020-02-12 12:10 AM (#594105 - in reply to #594056)
Subject: Re: Throttle shaft repair



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Posts: 8606
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Location: WHEELING,WV.>>>HOME OF WWVA
try carb cleaner down the throat . over the yrs i've had a few with the same problem and a good cleaning fixed em all . mostly holley 94's-------------------------------------------------later
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