[AT] grease in steering gearbox

[Larry D. Goss]

And it doesn't refer to grape juice or cheap wine either, Rog.

Welch plugs are used to seal up machined or cast holes in carburetors,
transmissions, and other low pressure applications where you want to
close up a hole that was put in the product during manufacturing, but
that needs to be closed off during operation.  A "raw" Welch plug is
simply a round disk that has been bent so the center of it bulges.  It's
convex on one side and obviously concave on the other.  You install the
plug into a hole (the hole has to have a counterbore in it) so the
convex side is facing out.  You can then use a hammer and punch to put a
dimple in the center of the plug.  This causes it to expand and grip the
sides of the hole right at the bottom of the counterbore.

When you get a carburetor overhaul kit for many models, it will usually
include brand new Welch plugs so you can use a small cape chisel to
remove the old plugs, clean the inside passages, and then install new
plugs to seal it all off again.

The shifter rail holes on transmissions are usually sealed off with
Welch plugs, too.  On those, you can usually force the plug out with the
shifter rail itself, recondition the plug by forcing a ball bearing into
the center of it while holding the plug over a hole that is smaller than
its outer diameter, and then reinstall the plugs when you put the
shifter rails back together.

Larry

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Mark Greer
Sent: Thursday, June 09, 2005 6:45 PM
To: Antique tractor email discussion group
Subject: Re: [AT] grease in steering gearbox

Original patent holder and manufacturer of the Welch Expansion Plug
since
1913, M.D. Hubbard offers the widest range of sizes anywhere -- from
1/8"diameter up to 6"diameter
http://www.hubbardspring.com/explugs.php

----- Original Message ----- 
From: "Roger Welsch" <captneb at micrord.com>
To: "Antique tractor email discussion group"
<at at lists.antique-tractor.com>
Sent: Thursday, June 09, 2005 8:45 AM
Subject: Re: [AT] grease in steering gearbox


> Welch plug?  Has my fame spread?  Word of my recent health problems?
What
> is a Welch plug?  And please, no smart remarks.....
>

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