The gearbox is probably unusable and welding will just make the chance of
more expense very probable. I believe it is a matter of harmonics
vibration. I found this to be true in the Early TR-4 cases where they
cracked a the bellousing tot he gearbox . We had a terrible time with
this. I did find one way to help the situation. I made two steel hangers
out of 1/8" cold roll steel trap 1.5" wide and attached them on each side
of the gearbox at the bell housing then up to each side of where the
battery box is. I then mounted these straps hangers to small rubber mounts
to help with the shock and to take soem of the weight.. This saved me many
races until the factory finally understood my problem nd then added the big
ribs down each side. I also added 1/2" thick aluminum ribs on the side of
the gearbox. One case worked fine but another made it impossible to line
up the shafts due to the case changing shape under heat. The hangers will
work though.
*Never be beaten by equipment.*
On Tue, Oct 21, 2014 at 2:50 PM, Van Mulders Marcel <
van.mulders.marcel@telenet.be> wrote:
> In 2 years, I had 4 broken gearbox casing : maybe one of these can be
> repaired : it has a crack where the bottom of the gear casing and the rear
> wall are mating. Considering the weight of the engine and gearbox, the
> stresses at that point must be very high : the 4 cylinder TR's have 2
> mountings at the front of the engine and 1 mounting at the gearbox
> extension. A gearbox with overdrive has this rear mounting at the very end
> of this extension : the shearing force between casing and extension must be
> very high, one should think that the rear wall of the casing should be
> pulled out all the time in racing. Has someone tried welding a gearbox
> casing?
> Marcel
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