I weld them by first heating the area to cherry red with the torch, Then use
stainless steel rod have had no problems. Carl E.
Lawrie Alexander wrote:
> Eugene..........
>
> Typically, these manifolds do not accept being welded, whatever type of
> rod/gas/whatever is used. They appear to have been cast from some pretty
> awful steel that warps, bends, cracks, etc. from the heat of the cat.
> I've seen many that have been welded and brazed, but none where that was
> truly successful.
>
> As to the oil in (or, as you say, not in) your Z-S, there should be an
> o-ring at the bottom of the damper rod tube, around the holder for the
> needle. This latter is retained by a star washer. You have to drop the
> needle out, then drive the holder and the star washer up the tube from the
> bottom (which usually scores the tube so badly that the new o-ring will get
> damaged when you install it! But, hey, I didn't design the system!) After
> fitting the new o-ring, push the needle holder back down the tube and
> re-connect the needle. Oil should then be retained for at least a few weeks
> at a time..............
>
> Lawrie
> British Sportscar Center
> -----Original Message-----
> From: Eugene Harrison <eugh@2xtreme.net>
> To: mgs@autox.team.net <mgs@autox.team.net>
> Date: Monday, October 11, 1999 9:16 AM
> Subject: Welding cast iron and carb question
>
> >I have a cast iron exhaust manifold from a '79 MGB. It has a small crack
> >(3/4") at the
> >crotch of the "U" turn where the catalitic converter bolts on. A friend
> >has a Heli Arc welder and will weld it for me. My question is what
> >welding rod to use and are there any other preporation or technique I
> >should be aware of?
> > Also, the zenith carb keeps loosing its dampener oil. Ive had it
> >apart and i can't see what is to keep the oil in. No "O" ring etc. What
> >is the solution?
> >Thanks
> > Eugene
> >
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