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Adjusting the float on Rochester B
#1331342 Sat Oct 26 2019 11:47 PM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Need a bit of help adjusting the float on my Rochester B carb. I’m doing a rebuild and it says that the float level should be 1 9/32” and the float drop should be 1 3/4”. The float drop measures perfectly at 1 3/4”, but the float level measures 1 14/32”. I’m 5/32” too high and the adjustment pad is practically flat with no more room to adjust unless I push it past level. Should I do that to get it to 1 9/32”?

Thanks

Attached Files
image.jpg (159.12 KB, 240 downloads)
image.jpg (176.26 KB, 236 downloads)

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
Spotbiltxo #1331350 Sun Oct 27 2019 12:23 AM
Joined: Feb 2001
Posts: 6,822
W
Master Gabster
HUH??????


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: Adjusting the float on Rochester B
Spotbiltxo #1331354 Sun Oct 27 2019 12:37 AM
Joined: Mar 2002
Posts: 9,022
Master Gabster
The position of the tab looks pretty normal to me. A very small change makes quite a difference out on the arms where the floats are located.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Adjusting the float on Rochester B
Spotbiltxo #1331359 Sun Oct 27 2019 01:31 AM
Joined: Mar 2014
Posts: 1,611
J
Shop Shark
If it hasn't been straightened I will go with a taller setting (like 1 3/8 or so) so that the fuel level in the bowl will stay lower. This (a) makes it run a bit leaner and (b) keeps fuel from sloshing up where it will seep/weep/leak at that gasket line. You're at 1 7/16 and this is a little too tall. Fuel will cutoff a bit too soon. Just push the tab down a bit and check. This all got out of whack when the needle and seat changed. The old needle/seat let the float sit closer to the air horn when fuel cutoff occurred (meaning your fuel level would have been higher in there). Good luck.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Adjusting the float on Rochester B
Spotbiltxo #1331453 Sun Oct 27 2019 11:31 PM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Got the carb all back together and installed on the motor. Truck started on the first try, but then ran at full throttle! Stomped on the accelerator and nothing happened. Pulled the throttle and nothing changed. I shut it down and checked everything....... accelerator return spring still attached and working well. The throttle cable was correctly installed and not bound. Choke cable installed correctly and working properly. Accelerator pump working up and down nicely and not stuck or bound. Tried it again and the same thing happened. What is causing it to run wide open like this?

Attached Files
DD807768-6286-461C-81FC-960399D2AE23.jpeg (196.17 KB, 164 downloads)

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
Spotbiltxo #1331461 Mon Oct 28 2019 12:37 AM
Joined: Sep 2013
Posts: 1,038
M
Shop Shark
Need to pull the air cleaner, look down the throat and see where the butterfly is. Should be closed, sounds like it's not...by a lot. Time to adjust the throttle/accelerator cables.

Although you did state both cables are adjusted properly, can't imagine it going to wot without the throttle plate being out of position.

Good Luck,

RonR

Last edited by moparguy; Mon Oct 28 2019 12:39 AM.

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
Spotbiltxo #1331465 Mon Oct 28 2019 12:43 AM
Joined: Jan 2013
Posts: 1,661
S
Shop Shark
Check the pivot on the linkage bell crank didn't flip over to the other side


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,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
Spotbiltxo #1331540 Mon Oct 28 2019 12:52 PM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Thanks Ron and sstock. I’ll look down the throat and note the position of the butterfly. I’m sure that it’s wide open. Sstock, what is the linkage bell crank? Is it the long arm on the side with the coiled spring on it? That was a bit confusing when I put it back together.


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
Spotbiltxo #1331560 Mon Oct 28 2019 02:24 PM
Joined: Jan 2013
Posts: 1,661
S
Shop Shark
Bell crank is the pivot assembly that bolts to the block, its function is to change direction 90 degrees from the foot pedal rod to the throttle arm.

Last edited by sstock; Mon Oct 28 2019 02:25 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,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
Spotbiltxo #1331576 Mon Oct 28 2019 03:56 PM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Okay, that part is working fine. No problem with wear or restriction.


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