Lowie, it was a batch of idler gears which had too high a glass content in them from what I understand. They wore the layshaft which then wore them ... whcih then wore the layshaft some more.
IIRC the characteristic was that the teeth looked thinner and more pointy than normal once the idler had been run a few times.
The fix was the material change on the idler to the black SP idler, UM513
Now I have luckily never encountered an iffy idler so have not fitted the UM513 but from what I understand its a total cure so long as fitted with a fresh layshaft.
|