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Fiddling with Rambler's since 1995

Rambler American Restoration

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Holley Model 1931 Rebuild

Carburetor Cleaning & Inspection

You will need the following items to clean the carburetor:

  • Carburetor cleaner (I prefer Gunk brand in the gallon size)
  • Chemical resistant brushes (besides large brushes, I find that a paint gun cleaning set has a variety of small brushes that are very useful)
  • Chemical resistant gloves (I prefer Nitril gloves)
  • Shop towels
  • Razor blades or a gasket scraper
  • A large container of rinse water

Soak all metal parts according to the directions that came with the carburetor cleaner. You will probably need to scrub the carburetor throat and choke housing to remove all of the carbon from them. Plastic and foam parts should not be soaked but can be gently cleaned with carburetor cleaner. Make sure to rinse these parts immediately after you are finished cleaning them or the cleaner will ruin them.

Make sure that the hole in the jet in completely clear. If it is not, you can use something fairly soft like a tooth pick to clear it out. Do not use any type of metal pick or drill bit to do this as you may enlarge the hole and cause the carburetor to run rich.

After cleaning, check the following items:

  • Make sure that the rod that connects to the choke plates moves freely. If it does not, you will need to remove the staked in cover from the carburetor for further investigation. Be aware that a replacement cover does not come in the rebuild kit. The full procedure for doing this is described in the TSM so you will need to refer to it if you need to do this.
  • Make sure that the choke and throttle plates are not damaged (bent, chipped, etc...). Replace them if they are damaged.
  • Check the throttle and choke shafts for wear where they pass through the carburetor body. The shafts should also be checked to ensure they are not bent. Worn or damaged shafts will need to be replaced.
  • Make sure that the throttle and choke shafts move freely and smoothly in their bores. If the bores in the carburetor body are oval shaped or there is a lot of slop in them and the shafts are not damaged, you will either need to find a better carburetor body or have bushings machined for yours.
  • Inspect the fuel mixture screw for a bent tip, nicks, or groves. If any of these exist, the screw will need to be replaced. The bore in the carburetor body should also be inspected to make sure the hole the screw seats into is undamaged. If it is damaged, the carburetor body will need to be replaced.
  • Check the carburetor body for cracks, a warped mounting flange, and other damage. A slightly warped flange can be machined but any other problems will require replacing the body.

You should also clean up the threads using a tap and die set to make sure that they are all in good shape. Damaged threads can cause stripped holes or make the carburetor very difficult to disassemble in the future.

Carburetor Assembly,

Last Updated 03/07/10 03:24:54 PM