carb butterfly closing

deputystoneman · Jun 17, 2007

i have a 1968 camaro w/ the 250 6 cylinder. when the engine is cold or when i try to accelerate (war or cold) the butterfly closes and the engine stalls.
it closes so hard that i have to tap it with the screwdriver handle to open it. what is going on?

wiskeesour · Jun 17, 2007

Should be an old 2barrel rochester.....hm...Thise are normally good carbs. Most ppl dont like them cause they cant tune them. Its manual choke? is the linkage hung up somehow? wow...ill have to think about this one...

77wolf10.85 · Jun 17, 2007

Are you asking about the choke or the throttle plate?

deputystoneman · Jun 17, 2007

a mechanic i'm not. it is a 1 bbl. carb. the stmping on it says bay city monojet.
it is the choke.

77wolf10.85 · Jun 17, 2007

Cable or wire going to choke?

Or neither?

deputystoneman · Jun 17, 2007

looks like the butterfly is connected my a pre-formed rod to a spring near the exhaust manifold.

77wolf10.85 · Jun 17, 2007

spring broke or stuck?

harley help me out I haven't seen one in forever!

deputystoneman · Jun 17, 2007

after i manually release the butterfly, and watch as the engine warms up the i can see the butterfly open up as the engine warms.
but try to driuve it and i am back to square one.

thanks for all the help.

77wolf10.85 · Jun 17, 2007

I think something is stuck.

http://www.teufert.net/carbs/1-barrel.htm

I'm looking for a picture to help me remember what it even looks like. Last 1 bbl I saw was on our 50, and it had manual choke.

77wolf10.85 · Jun 17, 2007

The rod you're talking about, could it be a tube?

And does it go to a round black thing on the carb?

wiskeesour · Jun 17, 2007

Holy Moly Tim!! I havent seen a bay city mono ever on a car.....saw a bunch on old tractors.....Sounds like the spring or the metal valve inside the exhaust is hung up....after warmup.

deputystoneman · Jun 17, 2007

dissapears inside the carb. it is a rod and it moves the butterfly.

wiskeesour · Jun 17, 2007

I cant find any pics of this thing, can you get some pics????

77wolf10.85 · Jun 17, 2007

I found some pics of older 2 bbl marine roch carbs, and they had heat transfer tube style chokes.

I think the lever has come out of the spring inside the control, or something is stuck.
Or he has something different, a different animal than I'm thinking maybe.

I need to see it to do him any good.

77wolf10.85 · Jun 17, 2007

deputystoneman said:
dissapears inside the carb. it is a rod and it moves the butterfly.

Yup, heat transfer to a spring. That lever goes into a spring. Either it is not in the loop on the end of the spring or the spring is stuck, broken or something.

77wolf10.85 · Jun 17, 2007

wiskeesour said:
Holy Moly Tim!! I havent seen a bay city mono ever on a car.....saw a bunch on old tractors.....Sounds like the spring or the metal valve inside the exhaust is hung up....after warmup.

Were they down on the exhaust manifold? Heat riser has an external spring sometimes, but I don't remember seeing choke hooked into a spring on the exhaust manifold.

deputystoneman · Jun 17, 2007

thanks for the help.
i plan on taking it apart this week aftger work. i will post an update.

wiskeesour · Jun 17, 2007

77wolf10.85 said:
Were they down on the exhaust manifold? Heat riser has an external spring sometimes, but I don't remember seeing choke hooked into a spring on the exhaust manifold.

Trying....to....remember......the spring was inside a tube along the manifold....as it got hot it released tension and released the choke....thats a minneapolis moline(?) tho....it wasnt a rochester. seem like the farmall had a rochester(?)

77wolf10.85 · Jun 17, 2007

Here's what the 50 has
http://cgi.ebay.com/ebaymotors/Roch...QcmdZViewItemQQcategoryZ33550QQihZ011QQitemZ320124982203QQrdZ1QQsspagenameZWDVW

this one says its 1965
http://cgi.ebay.com/ebaymotors/1965...tegoryZ33550QQihZ014QQitemZ330132908356QQrdZ1QQsspagenameZWDVW#ebayphotohosting

But I bet this is what he has

http://cgi.ebay.com/ebaymotors/Vint...QcmdZViewItemQQcategoryZ33550QQihZ019QQitemZ290129221824QQrdZ1QQsspagenameZWDVW

The tube he's talking about is the bowl vent or external one goes to intake or exhaust to get heat
It has heat transfer choke, and I bet it's stuck inside or misadjusted or fell out of the spring loop.

Pop the cap and look see

wiskeesour · Jun 17, 2007

wouldnt be the last one...has the elec choke.....

carb butterfly closing

deputystoneman

wiskeesour

77wolf10.85

deputystoneman

77wolf10.85

deputystoneman

77wolf10.85

deputystoneman

77wolf10.85

77wolf10.85

wiskeesour

deputystoneman

wiskeesour

77wolf10.85

77wolf10.85

77wolf10.85

deputystoneman

wiskeesour

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