JB Weld and other Epoxies

Subj:	JB Weld question
Date:	96-09-09 22:52:11 EDT
From:	donb@cts.com (Don Bowen)

I was trying to get the IHC LA running for an upcoming show.  I finally
managed to get it to start but is was not running well at all.  I noticed
that the fuel line was loose and it would not tighten.  After taking it
apart I found the threads on the mixer body stripped out and several layers
of gasket compound and silicon.

The question is, what can I use to fix this?  Do they make Helicoils for
fuel lines or will JB Weld do the Job?  If JB Weld, is there a release agent
so I could form the threads with the fuel line fitting?  Any and all
comments and suggestions welcome.

    Don Bowen                      donb@cts.com
    Valley Center, CA              Senior Software Engineer
    Bee Point acres                Smith Automation Systems, Inc
    USDA Zone 9, Sunset Zone 21    Don.bowen@integrators.com
---------------------------
Subj:	Re: JB Weld question
Date:	96-09-10 00:10:55 EDT
From:	rskinner@A.crl.com (Rob Skinner)

Permatex makes some goop called "Form-A-Thread."  It's a two part epoxy with
a release agent, just like you suggested.  I've used it on some aluminum
castings that were about 10-32.  It's performance was marginal, but under
other applications it might have worked better.  I used it on an assembly
that was taken apart and reassembled frequently, and I couldn't keep the
gorillas away from it (how do you think it got stripped in the first
place?).  If you take care when tightening, and don't need to keep taking it
apart, it might work ok.  

Rob Skinner  rskinner@a.crl.com
-------------------------------
Subj:	Re: JB Weld question
Date:	96-09-10 00:13:01 EDT
From:	blearned@ave.net (Bob Learned)

Hi Don,

I would not recommend JB weld for this. The best way to fix this problem is
to put in an oversize threaded plug and drill and tap it for the fitting.
Any machine shop can do this or you can do it yourself if you have access to
a milling machine. Sometimes if you have enough meat, you can use a standard
pipe reducer for the plug and then you don't have to drill and tap it.

Bob Learned
------------------------
Subj:	Re: JB Weld question
Date:	96-09-10 09:43:52 EDT
From:	mogul@stlnet.com (Charles R. Bryant)

Don,

Ted Brookover uses a DEVON or DEVLON 80 on magneto bases. I don't know the source of it though. 
----------------------------------------
Subj:	RE: JB Weld question
Date:	96-09-10 10:50:00 EDT
From:	Tim.Koth@twa.com (Koth, Tim)

Thats DEVCON. they have about 30 different styles and grades of epoxies,
some with atomized metal powders in them to strengthen them. Some of
them are so hard after curing they can be drilled and tapped themselves.
--------------------------------------------
Subj:	RE: JB Weld question
Date:	96-09-10 16:04:18 EDT
From:	Tim.Koth@twa.com (Koth, Tim)

I've heard  some of the DEVCON products can withstand temperatures of
500 degrees F, but I don't know where to get that stuff. Some of the
plain-jane DEVCON epoxies can be had at KMART. WR GRAINGER lists several
styles of DEVCON products and one thats filled with aluminum powder is
rated to 350 F. They also carry the stainless steel putty as well but it
doesn't have a temp rating in the catalog. Graingers has outlets in most
major areas and if you tell me where you are I could check my catalog
and give you their local number.
------------------------------------------
Subj:	Re: JB Weld question
Date:	96-09-10 18:56:57 EDT
From:	MaytagTwin@aol.com

There are many things that can be used as a release agent for epoxies.... 

Hi,Don and others,

Regarding expoxies, application and possible release agents.  Devcon, of
Danvers, MA, makes many products (or, did).  One, Plastic Steel, I used to
build up the splines on the drive axle shafts of a Fiat 500 where they fit
into cast iron splined hubs.  The hubs, as manufactured, were not shielded
from the salt of Michigan highways and the cast iron stripped out and the
steel axle shafts were badly worn.  I didn't want to open the transaxle to
replace the axle shafts.  At $5 per cast iron hub (1967 $) I bought two and a
tube of Devcon Plastic Steel.  I coated the inside of the new splined hubs
with a thin coat of Johnsons Paste wax, cleaned the shaft splines with carbon
tet (yes, you could get it back then), mixed the epoxy and assembled the hub
onto the shaft with all the epoxy I could get in the joint.  Then, overnight
cure with an electric hot pad for each glue job (it was Winter), separate
with a big gear puller, grease with chassis grease, fit a piece of bicycle
inner tube stuffed with grease and over the joint and two hose clamps to
fasten it to the hub and shaft and the job was done.  I drove the little
machine 10,000 miles successfully before selling it.  The Devcon held.  

Regarding Devcon, at one time I received a list of their products with the
specifications such as temperature, cure time, tensile strength, hardness,
and even coefficient of friction as one of their products was intended to
serve as a bearing surface.  Maybe one could "Devcon" a connecting rod or
main instead of using Babbitt metal.  It would be a little safer to work and
show engines don't have extended heavy bearing loads.  Maybe it would work
well although I realize it would be using a modern material on an antique
engine.  
Ron
------------------------------------------------------
Subj:	Re: JB Weld question
Date:	96-09-10 21:37:57 EDT
From:	102770.2703@compuserve.com (Grant Fish)
Sender:	owner-stationary-engine@indiana.edu

Don,

JB Weld will probably work if you NEVER plan to take this thing apart again.  I
think what you are looking for is Loc-Tite Form-a-Thread.  It is supposed to
repair stripped threads strong enough to accept the bolts original torque.  It
does come with a release agent that is applied to the bolt to allow it to be
removed.  I've used it a couple of times and it seems to work, although I was
very conservative when tightening the bolt.

Are these tapered pipe threads?  If so, why not just drill and tap for the next
larger pipe size and use a reducer bushing.  If you are concerned about original
appearance, apply some permanent (red) Loc-Tite to the bushing, tighten the
busing in the casting, then grind it off flush with the castings surface.
Since the threads are tapered, you will have to re-tap the bushing after
grinding it off or you will never be able to start the fitting into the bushing.
Grant Fish
102770.2703@compuserve.com
Columbus (well, really, West Jefferson) Ohio
Power equipment and generator mechanic and
antique tractor collector wannabe
--------------------------------------------------
Subj:	No Subject
Date:	96-09-19 00:54:45 EDT
From:	mogul@stlnet.com (Charles R. Bryant)

John,

What DEVCON No. do you use instead of JB Weld. Someone
told me DEVCON 80 but that turned out to be a rubber 
base.
Charlie
----------------------------------------------------
Subj:	No Subject
Date:	96-09-19 09:03:36 EDT
From:	BAILEY@MCNEESE.EDU (John Bailey)

On Wed, 18 Sep 1996 23:46:49 -0500 (CDT) Charles R. Bryant said:
|John,
|
|What DEVCON No. do you use instead of JB Weld. Someone
|told me DEVCON 80 but that turned out to be a rubber
|base.
|
|Charlie

Charlie:  I'll check tonight and post the number tomorrow.

John
------------------------------------------------------------
Subj:	DEVCON
Date:	96-09-24 09:21:17 EDT
From:	Tim.Koth@twa.com (Koth, Tim)

   After all the discussion last week about DEVCON and glues, I just
found that they have a WWW site. It is... surprisingly... WWW.DEVCON.COM
     In a sales add I'm looking at, they even have an epoxy that is
titanium filled, that can be machined as if it were a cast metal part.
Pretty interesting stuff.....
------------------------------------------------------------
Subj:	Re: DEVCON
Date:	96-09-24 20:26:25 EDT
From:	rskinner@A.crl.com (Rob Skinner)

At 10:03 AM 9/24/96 EST, you wrote:
|     Anyway - would that work well for pitted cylinders and valve seats on
|     these old slow low temp engines?  Maybe better than JB?

Devcon Titanium Putty
 *rebuilds work/gouged shafts
 *repairs scored hydraulic rams
 *refits worn keyways
 *rebuilds wear ring surfaces
 *reseats oversized bearing housings
 One pound:  $50 from MSC

Rob Skinner  rskinner@a.crl.com
------------------------------------------
Subj:	Re: 6 HP Fairbanks-Morse update.
Date:	96-10-15 18:56:36 EDT
From:	drotigel@westol.com (Dave Rotigel)

|On Mon, 14 Oct 1996 19:30:29 -0700 Orrin Iseminger said:
||
||Where did you get the Devcon?  I've been looking but can't seem to find it
||out here in the boondocks.
||
||Orrin

John

Devcon has a HP at http://media4.hypernet.com/~DEVCON/devcon.html
        Dave
PS, ABC, VFD! :-)

David E. Rotigel and Sons


-----------------------------------
----------------------------------------
Subj:	Joe Kelley's Super Glue
Date:	96-09-17 16:13:26 EDT
From:	mogul@stlnet.com (Charles R. Bryant)

While visiting Joe Kelley this summer we broke a piece off
of a rocker arm bracket while loading engines. Joe said ,"no
problem, I have some super glue which will fix that" and he
proceeded to make the repair. He said this stuff is so good
that I even glued the broken governor bracket on my 1 1/2 MD.
Boy I said I've got to get some of this stuff. It was Lock-Tite
635. This is an industrial glue so I had to order it through
my friends hardware store. When I went to Bearing Headquarters
yesterday to pick it up the guy at the counter brought out the
8 ounce plastic bottle. I said I'll pay cash and the guy said that
will be $104 plus tax. I must of turned pale because he asked me
if he should call 911. I said no but don't you have this in smaller
quantities. He said no but I do have an alternate no. in the 1.5 ounce
size which is about the same. So I took that. It was Lock-Tite 680.
What amazes me is I can't imaging Joe Kelley paying $104 for a bottle
of glue (maybe he needed it on a Galloway engine he recently sold).

Charlie
----------------------------