67 carb return spring

[William C.]

John H. or Joe L. The return spring in the AIM is hooked through the accelerator rod. I have seen cars including my 67 L79 that have a cotter pin instead of the spring. Is this a safety issue or is it done incorrectly?

[John H.]

Re: 67 carb return spring

John H. or Joe L. The return spring in the AIM is hooked through the accelerator rod. I have seen cars including my 67 L79 that have a cotter pin instead of the spring. Is this a safety issue or is it done incorrectly?

Bill -

The carb end of the accelerator rod was retained in the bushing by the end of the return spring on both the 300hp and 350hp engines; no cotter pin was used.

[Joe L.]

Re: 67 carb return spring

John H. or Joe L. The return spring in the AIM is hooked through the accelerator rod. I have seen cars including my 67 L79 that have a cotter pin instead of the spring. Is this a safety issue or is it done incorrectly?

William------


This is what often results when a previous klutz incorrectly installs a throttle return spring. Then he wonders "... what's supposed to hold the accelerator rod? Oh, it must be a cotter pin! I wonder why I don't find one in the parts I removed? Oh well, I must have lost it, so I'll use a new one.."

[William C.]

Re: 67 carb return spring

Thanks John & Joe...

[Stuart F.]

Re: 67 carb return spring

Then there is another school of thought based on what is shown in the AIM and JG for at least the 63 and 64 model years. The blow up of View "A" shows a cotter pin in the throttle rod at the carb end, but the overall view shows the spring. I have seen them done both ways on different apllications, both new and old (55 and up). I suspect some carbs did not have a hole for the spring and others did. I have two 3720/21 series AFB's, one a 3720SA, does not have a hole while the 3721SB has.

I prefer using the spring on my 3721SB to retain the rod so I can use the hole in the arm for a booster spring for ordinary driving to maintain a good steady idle set.

Stu Fox