The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: philwhitelaw on 17.04. 2020 17:20
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Happy Friday everyone! I have a collection of Triumph brake shoes which I need some help with. The first shoes are just marked 1092, are 1 9/16 wide for an 8" drum, the linings are also marked 1092 Triumph. Of the four shoes three are identical with the remaining one a mirror image to form a pair (i.e. put the shoes profile together and the cam and pivot faces are swapped over). The same applies to the shoes marked W1074/5. Five are identical with one the mirror image. My first question is why are the casting numbers the same for the 1092's? Secondly, because the shoes are marked 1074/5 could these be fitted 180* to each other in a TLS drum? I ask this because some are additionally marked LM4 with possibly a T on the other side.
Thanks, Phil W.
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LM4 could be a reference to the type of alloy they're made from. Quite popular in the 60's / 70's.
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Yep made thousands of tons of LM4 in the 70's
It is a heat treatable Al-Si alloy with up to 4% Cu
Generally used for gravity die casting.