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#1262010 04/09/2018 8:47 PM
Joined: Nov 2017
Posts: 41
T
Fixer of Things I Probably Broke
Fixer of Things I Probably Broke
T Offline
Joined: Nov 2017
Posts: 41
I've got an auto choke Rochester BC that is currently set up for manual choke -- because... FUN!

However, the auto-choke vacuum port just keeps sucking in outside air. Is it fine to just cap this off hard? Or is the carb relying on that extra air intake for something besides heating the spring? (Ie, do I need to slap a filter on it).


1953 Chevy 3100 Frankentruck with 235 and mostly original bits.
Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269
"cap it off hard"

If you have a 53/54 (or, earlier) BC, that choke uses a heat stove that is clamped to a manifold. It relies on heat transfer to actuate the choke flapper and it is "balanced" by engine vacuum. It literally sounds like you have a vacuum leak?

I'd "cap it off hard" - plug that leak.

Let's see what others have to say?

http://chevy.oldcarmanualproject.com/carb/Rochester/9C304p02.htm
http://chevy.oldcarmanualproject.com/carb/Rochester/9D8p07.htm

Joined: Feb 2004
Posts: 29,752
H
Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
H Offline
Joined: Feb 2004
Posts: 29,752
It's already ruined with the manual choke conversion. Go ahead and plug the port- - - -it won't make things any worse.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
Joined: Mar 2003
Posts: 1,132
W
Shop Shark
Shop Shark
W Offline
Joined: Mar 2003
Posts: 1,132
cant get a temp indication on the gage. How can I check the sender to see if its working?

Joined: Mar 2010
Posts: 10,272
5
Renaissance Man
Renaissance Man
5 Offline
Joined: Mar 2010
Posts: 10,272
The only way to test the sender is to apply heat to it (run the engine for a while). If the gauge doesn't move when the sender is heated up, you either have a bad capillary tube/bulb or a bad gauge. Either way, you need another gauge/sender assembly.


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission

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