<VV> Advice needed - loose throttle shaft

[corvairduval at cox.net]

You remove that belcrank by grinding/filing/sanding the "peen" off. The
peen looks rectangular because it is made from a shaft with two flats, like
Harry says.

When you peen it to remove the wobble, place the other end of the shaft
against someting hard. You do not want your peening force to drive the
throttle plate into the venturi of the carb.

A repair that might work is to file off the peen, center drill the shaft
for a 6-32 size tap and install a 6-32 x 1/2 large head screw. This is what
comes with the new shaft. Buying a new one is proabably more cost
effective, as when you take out the old shaft you will find it is smaller
than it used to be, allowing air leaks around the shaft. When the chrome
plating wears away, the brass shaft wears quicker than the pot metal carb.

Frank DuVal

Original Message:
-----------------
From: Harry Yarnell hyarnell1 at earthlink.net
This is a common problem. The throttle shaft is brass. It has two flats on
the end that fit into the throttle bellcrank and swedged on. They have a
habit of coming loose like yours. 
A quick and dirty 'repair' is to ball peen the swedge back into a holding
pattern; to tighten it up.
Something tells me you can't braze the shaft/belcrank; that maybe the shaft
is phosphor bronze or some other alloy.
Thought I tried this once decades ago with disastrous results. YMMV

-----Original Message-----
Subject: <VV> Advice needed - loose throttle shaft

Friends,
	While attempting to finish my major tuneup today I discovered my
engine
is basically idling only on the left carburetor, and tracing the problem
revealed that the throttle lever on the right carburetor is extremely
loose on the throttle shaft, to the point where even turning the idle
adjustment screw in as far as it will go, it doesn't actually open the
throttle. The throttle lever appears to be attached to the shaft by a
brass cap that looks a little like a TV screen, and I can't tell whether
it's pressed in, screwed in, or what. My questions are:

1. Is there a way to tighten this brass gadget to eliminate the rotation
of the throttle lever on the shaft? That would cure my problem. I tried
(very gently!) to twist it, in case it's screwed in, but I didn't want
to put much force on anything for fear of messing up the throttle shaft,
which appears to be quite sound. I also tried gently peening the brass
cap, but that accomplished nothing because I wasn't applying much
energy.

2. If I get a new throttle shaft from Clark's, I presume I'd still have
to remove the throttle lever and reinstall it on the new shaft, so in
any case I need to know how to get the lever off the shaft. I suspect I
could just grind off the little brass cap from the existing shaft, but I
hate to use such irreversible methods. 

3. I think a cheap trick might be to get a longer idle speed adjustment
screw that would allow me to screw it in farther than the stock screw,
but that seems like an irresponsible workaround that might lead to other
problems.

4. I've got a small welding set that I could use to braze the cap to the
throttle shaft, but that also seems like an unpardonable (and
irreversible) cheat.

Thanks,
Chuck McKinley
63 Monza 900 80 hp 3-speed

 

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