The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Happy New Year


2020

A New Year
A New Decade
A New Vision

Ring in the new with some quality time with your old truck! A great time to tackle a winter project. If you do not have access to your truck, start your parts list for spring!
The days are officially getting longer now, you know!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
8 registered members (Forty9, Dusty53, Greg Brown, glennj3, 2 invisible), 120 guests, and 4 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums48
Topics117,068
Posts935,318
Members42,772
Most Online1,027
Dec 27th, 2019
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Page 2 of 3 1 2 3
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331582 Mon Oct 28 2019 04:52 PM
Joined: Jan 2013
Posts: 1,553
S
sstock Offline
Shop Shark
My point is with the return spring on and the linkage unhooked from the carb, the bell carank can pivot past its fulcrum and make it so when you hook the linkage back up it is at full throttle.

Last edited by sstock; Mon Oct 28 2019 04:53 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331605 Mon Oct 28 2019 07:26 PM
Joined: Jan 2013
Posts: 1,467
N
ndkid275 Offline
Shop Shark
Chuck,

I can send you a picture so you can double check that your linkage is just like mine.

Chris

Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331759 Tue Oct 29 2019 03:38 PM
Joined: Jun 2008
Posts: 1,263
S
Spotbiltxo Offline OP
Shop Shark
Chris, please send me a pic of the linkage side of your carb. Thanks!


Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331835 Wed Oct 30 2019 12:52 AM
Joined: Jun 2008
Posts: 1,263
S
Spotbiltxo Offline OP
Shop Shark
Okay guys, I need some help. I just finished taking the carb back off the motor in hopes of finding that the bottom butterfly was wide open or was at least binding, but I found no such thing. The butterfly was closed and moved easily whenever I moved the accelerator lever. (or whatever it’s real name is) I was hoping that I would find it stuck wide-open and that would be the cause of it running wide open when I first started the motor last Sunday. I’m really puzzled now about what the cause of it is. If anyone has any ideas I’d sure like to hear them. Thank you.

Moderator, tell me if I need to start a new post since this is a new problem and I’ll do so. Thanks


Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331844 Wed Oct 30 2019 01:18 AM
Joined: Mar 2010
Posts: 8,758
5
52Carl Offline
Master Gabster
Did you verify that the throttle valve was closed prior to removing the carburetor?
How did it run before you worked on the carburetor?
A massive vacuum leak can cause a high idle, but not full throttle.

Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331850 Wed Oct 30 2019 01:43 AM
Joined: Mar 2014
Posts: 1,134
J
Jon G Offline
Shop Shark
The Rochester B has what is called a "snatch idle" circuit. Fuel is pulled in through the main jet, up and across the main output orifice...the bar you see when you look down the throat and then to the the idle bleeds. If you hark back to the stuff I posted over a year ago on the Rochester B, maybe you can see how this works. Obviously something is very oddly wrong here. If your bottom butterfly is closed, I can't imagine how you could be running at full throttle. You simply can't get enough air so even if you're pushing too much fuel through the thing, the mixture would be way too rich for it to even work. Sorry I don't have the answer. I'm stumped at the moment.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331852 Wed Oct 30 2019 01:53 AM
Joined: Feb 2004
Posts: 19,474
H
Hotrod Lincoln Online
Boltergeist
Just to confirm- - - - -have you looked down the carburetor throat with the carb installed, and verified that the throttle plate is closed? Doing it with the carb on the bench is no guarantee that you're not making a mistake hooking up the linkage. Also, since the fast idle cam and the position of the choke interacts with the idle screw, what's the possibility that the choke linkage has been assembled incorrectly? An "idle" speed in the neighborhood of 2,000-2,500 RPM is going to sound like WOT, even when the throttle blade is only slightly open due to a sticky fast idle setup.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1331877 Wed Oct 30 2019 11:20 AM
Joined: Jun 2008
Posts: 1,263
S
Spotbiltxo Offline OP
Shop Shark
52carl...... it was running near perfect before gasoline started pouring out the bottom of it and the engine wouldn’t crank. That’s the reason I had to put a kit in it.

Jon G........ yes, I looked down the throat of the carb and the throttle plate was in the closed position. Moves freely when the lever is pushed up and down.

Jerry ....... I have attached a picture this time showing you how it looks after assembly. Did I do it incorrectly? I backed off the idle setscrew so it’s not even functional at the moment.

The only vacuum leak issue I discovered was a split in the hose coming from the manifold to the wipers. But it’s not very big. Distributor vacuum advance hose was attached.

If it looks like I have assembled it correctly and we’re all still stumped as to what the problem could be, I’ll reinstall the carb and try starting it again.

Attached Files

Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1332152 Fri Nov 01 2019 01:25 PM
Joined: Sep 2013
Posts: 934
M
moparguy Offline
Shop Shark
[img]https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/download/Number/12506/filename/2014 Graduations, Tucker and pipe 005.JPG[/img][img]https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/download/Number/12504/filename/2014 Graduations, Tucker and pipe 001.JPG[/img]Chuck, just stumbled across these. Stock Rochester on a '51 3600. Hope they help.

Attached Files

1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Adjusting the float on Rochester B [Re: Spotbiltxo] #1332189 Fri Nov 01 2019 06:56 PM
Joined: Jun 2008
Posts: 1,263
S
Spotbiltxo Offline OP
Shop Shark
Thank you Moparguy, I don’t believe I have reassembled everything correctly according to your pictures. I just put the carb back on and started the engine and the same thing happened. I quickly pulled out the screwdriver and took off the keeper on the throttle cable allowing any tension to be relieved. The engine started to slow down, so I manually pulled down on the accelerator rod and it came to a normal idle. I concluded that I must have tightened the throttle cable too tight in the linkage, although the throttle knob was all the way in. I let it idle for 20 minutes and it ran just fine except for gasoline weeping from the fuel line-to-carb connection. I’ve tightened-loosened-tightened it 3 times and have it 98% stopped. I’ll eventually get it completely stopped. I think I have solved my problem, but keep your fingers crossed!


Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Page 2 of 3 1 2 3

Moderated by  Woogeroo 

Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.3