Click on image for the lowdown. 
====
|
| | Forums66 Topics128,050 Posts1,055,753 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
|
| THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
|
| | | Joined: Feb 2010 Posts: 323 'Bolter | | 'Bolter Joined: Feb 2010 Posts: 323 | The old Zenith carb on my 248 has a rusted solid throttle shaft. It’s soaking in WD40 but I don’t have much hope. Obviously hasn’t run in years but I’m pretty sure the engine is ok. What’s a good replacement carburetor without breaking the bank ? The previous owner had the carb off and exposed to the weather.
These old bolts are in my blood. Hard thing is focusing on just one.
1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler
| | | | | Joined: Nov 2002 Posts: 2,765 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,765 | The Zenith carbs for the 248 are much more common, and much less expensive than those for the 270. Not much available (ever) that is better than the Zenith. I would suggest, if you wish to replace it, find another Zenith with the same tag number (assuming that the Zenith you have is correct for the application).
WD-40 is probably not going to free the frozen shaft. Remove the throttle body from the rest of the carburetor, and remove everything you can remove. Now, heat the throttle body as hot as you can in an ELECTRIC toaster over (DO YOU USE A GAS OVEN!). Remove the evenly heated throttle body from the toaster over, and with an acetylene torch, spot heat the casting where the throttle shaft goes through until cherry red on both sides. Set it aside for an hour or so and allow it to completely cool naturally. DO NOT QUENCH IN WATER!. Now, gently try to work the throttle shaft, using the WD-40 as needed.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | Just curious, would soaking the effected area in Evap-o-Rust overnight help?
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Nov 2002 Posts: 2,765 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,765 | Martin - I don't know, but don't think so. I don't believe it would penetrate the rust between the shaft and the body, just like the penetrating oil will not penetrate the effected area. Be interesting to try.
The heat burns the oxygen from the rust molecules between the shaft and the body, thereby reducing the volume occupied by the rust. This allows penetrating oil to penetrate the now porous rust, and allows the shaft to rotate.
I have been using heat successfully for more than 50 years on cast iron throttle bodies.
Jon
Last edited by carbking; 07/06/2019 2:19 PM.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Dec 2003 Posts: 1,061 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 1,061 | I use some stuff called deep creep. I the same company that makes sea foam makes this stuff. They say heat and then use the deep creep. I just freed up a heat riser shaft using basically the same procedure as Carb king described but used deep creep. It took a couple days of soaking and repeating the process.
1946 1-ton Panel
1952 1-ton Comml. W/Grain Body
| | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | Kroil is the best rust-buster out there, bar none! www.kanolabs.comJerry
"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: Feb 2010 Posts: 323 'Bolter | | 'Bolter Joined: Feb 2010 Posts: 323 | Thanks for all the suggestions
24 hour soak in 50/50 Acetone ATF no affect Kroil for a few hours before heating with torch.
It broke loose. Now working great.
The metal accelerator pump was tough to get out. But finally got it out with no damage to carb body.
Left the check valve in until I get a rebuild kit hopefully it will be included.
Who makes a good kit for a Zenith 228?
These old bolts are in my blood. Hard thing is focusing on just one.
1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler
| | | | | Joined: Nov 2002 Posts: 2,765 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,765 | Glad the torch worked for you.
You will need the inside number from the round tag to acquire the correct rebuilding kit.
Our various kits for the various 228 carbs all include the check valves (2).
573-392-7378 (9-12, 1-4 Mon-Tues central time).
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
|
|
