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So, I kinda fudged up... #5367171 03/04/20 02:09 PM
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nthach Offline OP
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I'm in the process of reviving a Kohler Command 11 engine - cleaning up the carb and replacing the fuel pump due to California gas. In the process of tearing down the carb, I had to somehow get a welch plug removed. I used a screw and a hammer but that just deformed the plug. I then took a small 1.5mm flatblade screwdriver bit as a drift and managed to get the plug out.

The passages weren't damaged thankfully. But, the edge where the welch plug seats against is damaged, I did gouge the aluminum. It's not in a critical area but it could interfere with the carb working via an air or vacuum leak.

I was planning on using nail polish or a smear of epoxy to seal the plug after I drive the new one in. Will that work or just buy a new Chineseium carb?

Re: So, I kinda fudged up... [Re: nthach] #5367175 03/04/20 02:15 PM
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demarpaint Offline
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I'd get a Chineseium carb. In machines that I pulled out of the garbage, fixed and sold or used, I had great luck with them. They saved me a lot of time installing them, vs. a rebuild, when a carb was in need of a rebuild vs. a good cleaning.


God Bless Our Troops

Re: So, I kinda fudged up... [Re: nthach] #5367215 03/04/20 03:14 PM
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Schmoe Offline
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What's a welch plug???


01 Supercrew Lariat 4X4
06 Accord EX-L V6
2018 CRV EX-L
2017 Accord Coupe V6 EX-L 6AT
Re: So, I kinda fudged up... [Re: Schmoe] #5367220 03/04/20 03:18 PM
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vw7674 Online Content
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Metallic plug that seals the end of a drilled passageway in a carb body.
Like a miniature version of a freeze plug in an engine block.

Last edited by vw7674; 03/04/20 03:19 PM. Reason: more data
Re: So, I kinda fudged up... [Re: nthach] #5367230 03/04/20 03:31 PM
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gotcha! Thanks.


01 Supercrew Lariat 4X4
06 Accord EX-L V6
2018 CRV EX-L
2017 Accord Coupe V6 EX-L 6AT
Re: So, I kinda fudged up... [Re: nthach] #5367253 03/04/20 03:55 PM
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samven Offline
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If you have a tube of RTV gasket maker laying around you can smear it over the plug and wipe it off, just leaving a bit to fill the edges. Since its not a hot surface or likely to come into constant contact with gas any color will work. If you dont have that just try bathroom silicon caulk.

Re: So, I kinda fudged up... [Re: samven] #5367305 03/04/20 04:42 PM
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nthach Offline OP
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Originally Posted by samven
If you have a tube of RTV gasket maker laying around you can smear it over the plug and wipe it off, just leaving a bit to fill the edges. Since its not a hot surface or likely to come into constant contact with gas any color will work. If you dont have that just try bathroom silicon caulk.

I do have some RTV and Shoe Goo - I'll use the RTV first. That way I don't need to buy a 1-time use epoxy syringe and make a mess.

Re: So, I kinda fudged up... [Re: nthach] #5367520 03/04/20 08:18 PM
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Imp4 Offline
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Originally Posted by nthach
I do have some RTV and Shoe Goo - I'll use the RTV first. That way I don't need to buy a 1-time use epoxy syringe and make a mess.

Just use Permatex Ultra Black.


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: So, I kinda fudged up... [Re: nthach] #5367581 03/04/20 09:26 PM
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RyanY Offline
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A lot of these Welch plugs are expanded and don't need sealant. Here is a discussion on the tractor forum (https://www.mytractorforum.com/threads/welch-plug-sealant.93060/). Of course, if you fudged up the surface this may not work; in that case RTV or the special loctite product would be my choice.


2007 Cadillac CTS 3.6L >130k miles; mix of PUP/Magnatec 5W-30 + ACDelco PF2129G

2012 Honda Odyssey EX-L >107k miles; STP (Amalie) 0W20 + ACDelco PF2057
Re: So, I kinda fudged up... [Re: nthach] #5367750 03/05/20 06:28 AM
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Lubener Offline
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Originally Posted by nthach
Originally Posted by samven
If you have a tube of RTV gasket maker laying around you can smear it over the plug and wipe it off, just leaving a bit to fill the edges. Since its not a hot surface or likely to come into constant contact with gas any color will work. If you dont have that just try bathroom silicon caulk.

I do have some RTV and Shoe Goo - I'll use the RTV first. That way I don't need to buy a 1-time use epoxy syringe and make a mess.

Don't RTV or shoe goo anything in the carb, it likely won't last. You likely will get a new Welch plug with a carb kit. Very last resort would be JB Weld.

Last edited by Lubener; 03/05/20 06:32 AM.

The "thinking" man's friend.
Re: So, I kinda fudged up... [Re: Lubener] #5368064 03/05/20 01:24 PM
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nthach Offline OP
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Originally Posted by Lubener
Originally Posted by nthach
Originally Posted by samven
If you have a tube of RTV gasket maker laying around you can smear it over the plug and wipe it off, just leaving a bit to fill the edges. Since its not a hot surface or likely to come into constant contact with gas any color will work. If you dont have that just try bathroom silicon caulk.

I do have some RTV and Shoe Goo - I'll use the RTV first. That way I don't need to buy a 1-time use epoxy syringe and make a mess.

Don't RTV or shoe goo anything in the carb, it likely won't last. You likely will get a new Welch plug with a carb kit. Very last resort would be JB Weld.

I meant after I drive in a new welch plug - a smear of RTV or Shoe Goo on the outside of the welch plug. Not on the inner part where the air passages are. cool

Re: So, I kinda fudged up... [Re: nthach] #5368116 03/05/20 02:11 PM
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In the past I broke part of the stand that holds the locating pin on the float in the carb. Before I bought a new carb I used JB weld and repaired it. It worked for a couple more years then I sold it. I would tap the welch plug back in and seal it with JB weld. The repair I did in the bowl was located in a place where it was submerged in fuel.

Re: So, I kinda fudged up... [Re: vw7674] #5368228 03/05/20 04:17 PM
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Originally Posted by vw7674
Metallic plug that seals the end of a drilled passageway in a carb body.
Like a miniature version of a freeze plug in an engine block.


This is interesting. I have an older B and S that may need a new carb. I looked into the Chinese carbs on eBay and right where the choke should be, there’s a plug.


03 Jeep WJ 4.0 208k
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Re: So, I kinda fudged up... [Re: nthach] #5369817 03/07/20 11:56 AM
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I wouldn't even have taken the time to mess with the original. Store it somewhere safe and mail order a new one.


2019 Nissan Pathfinder SV
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2015 Nissan Versa 1.6 S
Re: So, I kinda fudged up... [Re: nthach] #5381942 03/21/20 09:20 AM
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racinjason Offline
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If you want to seal it, re install the Welch plug and seal it with clear fingernail polish.

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