The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Work those trucks!




Stovebolt is pleased to support the Salvation Army!
We're doing fine but many around the World are not. Instead of making a contribution to us this holiday season, how about making your contribution to a great organization with a long history of helping people in need around the world?

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
12 registered members (jerryschevyparts, 4100 Fire Truck, gsharum, Hambone, 78buckshot, Brad Allen), 320 guests, and 2 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums48
Topics116,599
Posts930,823
Members42,663
Most Online940
Apr 5th, 2017
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Carb rebuild kit for Zenith one barrell #1321892 Wed Aug 14 2019 10:08 PM
Joined: Jun 2012
Posts: 178
R
Red63 Offline OP
Shop Shark
Anybody got any idea's on how to find a rebuild kit for my 51 GMC 3 ton 270 ? I had it professionally cleaned and it still is
bogging down real bad and stalls out. I may need a new carb, but thought a rebuild might be worth a try.

Thanks, Troy


Troy

1963 Chevy C60
Big Red Chevy
In the Stovebolt Gallery
More pix on Photobucket

1951 GMC 453 Series 3-Ton Army Truck
In the Stovebolt Gallery
More pix on Photobucket
Re: Carb rebuild kit for Zenith one barrell [Re: Red63] #1321897 Wed Aug 14 2019 11:34 PM
Joined: Mar 2010
Posts: 34
B
buoymaker Offline
Wrench Fetcher
I bought a 55 first 1/2 ton with a 261 in it. Rebuilt the carburetor and it ran terrible. I learned the hard way.
It had a badly rusted (inside) fuel tank which means I had rust in the fuel lines, fuel pump, fuel filter and my newly rebuilt carburetor.
Replaced all of it and rebuilt the carburetor. Filled it with Non-Ethanol gas. Much better now but not ideal.
Next step is to replace the Rochester B with a Zenith.
For a Zenith, I would go to The Carburetor Shop website and see what model Zenith is listed for your truck.
There is a round brass tag on the top of your carburetor that has a stamped ID number.
For the ID number there is a matching kit number listed on the website as well as a phone number to call.
Carbking is much better on this than I am but you may need a few special tools.

Re: Carb rebuild kit for Zenith one barrell [Re: Red63] #1321936 Thu Aug 15 2019 08:09 AM
Joined: Feb 2001
Posts: 6,625
W
WE b OLD Online
Master Gabster


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: Carb rebuild kit for Zenith one barrell [Re: buoymaker] #1321990 Thu Aug 15 2019 07:05 PM
Joined: Jun 2012
Posts: 178
R
Red63 Offline OP
Shop Shark
Thanks guys, I will check for the id number and look at their website and try and figure it out. Then, maybe I can
get a kit ordered. I really appreciate ya'll getting back to me on this.

Troy


Troy

1963 Chevy C60
Big Red Chevy
In the Stovebolt Gallery
More pix on Photobucket

1951 GMC 453 Series 3-Ton Army Truck
In the Stovebolt Gallery
More pix on Photobucket
Re: Carb rebuild kit for Zenith one barrell [Re: Red63] #1322000 Thu Aug 15 2019 09:00 PM
Joined: Sep 2009
Posts: 219
G
Green_98 Offline
Shop Shark
I'm watching this, I just bought a Zenith 228 yesterday for my 261, and the carb does need a rebuild.


-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: Carb rebuild kit for Zenith one barrell [Re: Red63] #1322578 Mon Aug 19 2019 09:13 PM
Joined: Jul 2014
Posts: 144
1
1Ton_tommy Offline
Shop Shark
Zeiniths are not hard to overhaul but you do need to take your time and make sure everything is squeeeky clean. Also accuracy in measurement counts. Fuel pressure is also important. Also bear in mind that alcohol in the gas will make things run leaner and if you're working the truck hard can have bad results. I have had valve stems stick and temporarily stuck a piston when I picked up a tank of gas with too much alcohol. One eights turn on the main jet fixed that. These zenith carbs were available with adjustable main jets. I have two. I don't know if they are available now but it's worth asking.

One thing often overlooked is throttle shafts. When these wear they leak air and the idle speed won't be consistent -- sometimes high, sometimes low sometimes rough sometimes smooth. You need a drill press and a reamer to do this properly as you need to get the bushings on both sides square and concentric. This is a job I used to do frequently on SU carbs and now need to do on both Zenith carbs on my 235 so I'll have to come up with bushings and a new reamer. I don't know if new throttle shafts are available and it's not something one can fabricate easily. Bushings should not be a problem. It's a ream to fit proposition. If someone knows where to get throttle shafts, I like to know.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Carb rebuild kit for Zenith one barrell [Re: Red63] #1323187 Fri Aug 23 2019 09:11 PM
Joined: Jun 2012
Posts: 178
R
Red63 Offline OP
Shop Shark
Thanks so much for the reply 1Ton. I will be aware now a little more now of the details of this carb now as I go forward. I really
appreciate the sharing of your knowledge here.

Troy


Troy

1963 Chevy C60
Big Red Chevy
In the Stovebolt Gallery
More pix on Photobucket

1951 GMC 453 Series 3-Ton Army Truck
In the Stovebolt Gallery
More pix on Photobucket
Re: Carb rebuild kit for Zenith one barrell [Re: Red63] #1323212 Sat Aug 24 2019 12:52 AM
Joined: Mar 2010
Posts: 34
B
buoymaker Offline
Wrench Fetcher
Here is some reference info:

This link is from an IHC website. Zenith Bulletin Z-190-B for 28 and 228 models. Print date June 1950.
http://www.restoringcornelius.com/files/zenith_28_128_rebuild_manual.pdf

Zenith ID numbers for GMC with rebuilt kit numbers (sold at this site).
http://www.thecarburetorshop.com/TruckkitsG.htm#TkitGMC

also troubleshooting

http://www.thecarburetorshop.com/Troubleshooting.htm


Moderated by  69Cuda, Grigg 

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