[Vwdiesel] off topic, but diesel

[James Hansen]

Not epoxy based, but there is a water activated thermally stable metal
powder "glue", that has I think a silicate base glue in it.  it's been
around a long time, as in it is very similar to what my Grandad used when I
was a kid.  I was skeptical as all hell back then, but it did work- he
sealed an area where a head gasket leak cut a groove in an aluminum head,
successfully, that lasted the service life of the engine. It was on a
Wisconsin V4 engine on a swather, years and years ago...  But to find out
the product name, I would have to go out to an unheated shed, and root
through my Grandad's stuff, which I don't mind doing, it's a real good
memory lane time for me... but it is -30 right now and would take most of
the day I am sure.

So, I googled "high temperature manifold repair" and two things come up as
suspects.
I'm fairly certain that this:
http://www.aremco.com/news-item/pyro-putty-2400-high-temp-metal-sealer/
or this
http://www.amazon.com/Magic-18003-ThermoSteel-High-Temp-Repair/dp/B000HABA3O
is it.
and this:
http://www.permatex.com/documents/TDS/industrial/26346.pdf
is also the same stuff, just premixed with water and in a handy tube.
Also recommended for repairing boilers which scares the hell out of me....
sounds suspiciously like natural selection at work.

I think they are all basically the same thing, a metal/ceramic powder, you
add water to make a thick paste, it cures for a day, leaving a stable
silicate bonded metal/ceramic powder cement in place.  There is more info on
the aremco website that makes me confident that it (the aremco product) is
exactly the stuff I'm thinking of, and I'm thinking that the amazon link and
the permatex product is a simliar product, (and inexpensive to try).

Personally, I would try to make the hole smaller, can you form something
like a penny or even thinner, like a dime to cover the hole, and glue it in
place?   Ideally, a hose clamp that would hold the covering piece in place
you could in place the cement under it, clamp it, and slather the whole deal
with goop, or drill a small hole on either side, tap them, say 10-32, make a
thin plate to cover, and glue the cover and screws in place.  If this is a
crack that is out of hand, use a small drill to the ends of the crack before
you start anything like for a glass crack, to stop it from progressing.

If you can get at it with an arc welder, Stoody makes a silicon-bronze rod
that welds like a hot damn to fix exactly what you are trying to do- it is
soft enough to not break off from the thermal shock of welding/use AND you
could attach a filler piece to the cast, which could be something like the
piece of copper, brass, or a chunk of cast you could cut out of a
sacrificial manifold. I weld a lot, so personally, I would just use multiple
passes to bridge the whole (hole) mess, with just a propane torch for pre
and afterheat, and weld in place on the engine. Btdt, still have the
tractor, not pretty but pretty functional, and it really does weld like
putting on calking, amazing stuff. Here's a data sheet on it, see weldco 223
electrode:
http://www.stoodyind.com/Catalogs/FISC/05catpg353.pdf


Here's an epoxy based item that also came up:
http://metalinkwear.com/infernalloy-high-temperature-metal-repair-compound.h
tml
no experience with it whatsoever.

That all said, if this is a hole in a manifold of a light tractor with a
turbo, I doubt a wonder goop will hold against the pressure over time, might
need some mechanical advantage, such as a screwed on patch, or clamp, etc...
but welding is best.
good luck Val.
-james

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of Val Christian
Sent: December-09-13 8:08 AM
To: vwdiesel at vwfans.com
Subject: [Vwdiesel] off topic, but diesel

Hairy chest diesel.

I have a maniford for a compact diesel tractor, which is cast iron, and now
has a hole in it.  Does anyone have experience patching exhaust manifolds
with any epoxy materials?

The total area is about equivalent to a 10mm hole.


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