Anybody recognize this metal cup?

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San Jose Steve
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Anybody recognize this metal cup?

Post by San Jose Steve » Sat May 04, 2019 6:31 pm

I sure wish I had taken a picture. All 4 of my shop manuals and a google image search has turned up nothing. I removed the carb on my 72’ 124 to fix a loose manifold stud. This disc (on top of cam tower) came out with the throttle linkage. I can’t figure out where it goes now. The witness mark on the backside does not match the bushing at the bottom of the throttle bracket mounted to the cam tower. Not sure where it goes or if I may be missing another piece that would make its installation obvious. Anybody have a similar throttle linkage on their car? I’m stumped.....(again!) I hear a new 2019 “Fiata” calling my name.........Ha! -Steve

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San Jose Steve
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Re: Anybody recognize this metal cup?

Post by San Jose Steve » Sat May 04, 2019 11:09 pm

Ahhhh.....the cup covers the bushing in the firewall that the throttle rod passes through! Something still off though as the opposite end just barely protrudes through the gold bracket. The whole throttle rod floats fore and aft and wants to fall out of that gold bracket. I see no meant to lock it down, no circlip or cotter pin.

Does this throttle linkage look off to anyone? I don’t remember all this slop being there? Something is amiss. Thanks, -Steve
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bartigue
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Re: Anybody recognize this metal cup?

Post by bartigue » Sun May 05, 2019 6:12 am

What is the tape measure supposed to be showing?

That type of throttle is sloppy. How sloppy may be the question
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beek
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Re: Anybody recognize this metal cup?

Post by beek » Sun May 05, 2019 8:32 am

the metal cup is an addition, not stock, there was a bushing that had a shoulder and a sleeve that went into the rubber bushing in the firewall. What you are missing is the spring. The spring pushes against the "cup" and the rod holding tension towards the engine and keeping the throttle rod in place.
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San Jose Steve
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Re: Mystery Solved! Anybody recognize this metal cup?

Post by San Jose Steve » Sun May 05, 2019 1:18 pm

Thanks to all for the help..... that spring had rolled under my workbench. I picked it up last week but did not associate it with the Fiat. Thought it had fallen out of an old pair of pruning shears.... I almost tossed it out! It now makes total sense! THANK YOU! -Steve




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kmead
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Re: Anybody recognize this metal cup?

Post by kmead » Sun May 05, 2019 4:46 pm

The early design for the throttle on 124s is easily the worst solution to that problem possible. As the engine rocks on its mounts on acceleration and deceleration the throttle opening changes without you moving the pedal. It is part of what creates the pogoing effect many early 124s suffer.

Changing to a cable actuated solution makes all the difference in general drivability. A 131 throttle cable can be substituted to work with a little ingenuity.
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friedman
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Re: Anybody recognize this metal cup?

Post by friedman » Mon May 06, 2019 7:27 am

Not that hard to just change the entire throttle pedal and linkage assembly to the later style cable arrangement.
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Re: Anybody recognize this metal cup?

Post by fp55scca » Mon May 06, 2019 5:33 pm

--Steve, as Randy B. pointed out, you were missing the spring. Also, as noted, that metal cup on top of your cam box was not original.

--As discussed, this entire throttle design was not the best. Over a long period of time, the spring looses tension, the bushings can wear and the entire throttle assembly can jump out of its seat in the firewall. One of the easy fixes for this is to add an additional washer behind the spring to increase tension on the assembly. I suspect your metal cup may have been used for this purpose.
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