I have fixed a number of these IRS frames and reinforced and welded them
back together.
For the most part you can still get the cruciform plates and the
outriggers pieces for the rear control arms. I always put a gusset top
and bottom in that area.
The biggest problem I have had of late has been cars with the tube shock
conversions or "Break Me Here Brackets".
They fracture and break off the shock/rear diff cross member.
Replacement cross members are very hard to locate.
I developed a brace to over come that and have installed it on many club
members cars.
My sonic test for a rusty frame is a good body shop pick hammer or
similar. Midwest and Eastern frames disintegrate at the sight of one of
those.
Cut out the rusty area and replace with suitable thickness flat sheet (
I use .085" sheet as original).
Glenn
On 1/10/2013 1:26 PM, Larry Young wrote:
> I don't think anyone mentioned that the IRS cars are notorious for
> weakness in the mounts for the differential and the brackets up front
> where the lower A arms mount. These usually fail without the added
> stresses of racing. I did a frame off restoration of my TR250 last
> year. It has resided in Oklahoma (a relatively dry state) and been
> garaged for all but its first 6 years. It body was relatively rust
> free as Triumphs go (solid floors, etc). After repairing and
> reinforcing the usual problem areas, I noticed a very small pinhole
> on the bottom near the center (called the T-shirt) area. The thin
> metal was only a few square inches and may have been partially because
> it had scraped bottom there at some point. Since these frames rust
> from the inside, I wonder how many are out there with thin metal,
> which has not yet rusted all the way through? It seems that a visual
> inspection is not sufficient. Is there some sort of sonic testing
> device which could be used to check it over.
> Larry
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