Bigmet wrote: ↑Thu Sep 25, 2025 11:44 am
Your outdoor layout sustained operation will have presented ample opportunity for prolonged heating, if the cause was the same. (I fixed my own and a friend's 08 by utilising the pumping action to push 'Brasso' through the brass bearing several times, and that slackened the fit sufficiently that the problem was eliminated once all cleaned up and relubricated.)
Never thought to use Brasso on the drive shaft, a good idea indeed. Just one further note on bearings. On the Accurascale 50 the bearings are square and sit in a slot so they don't rotate with the drive shaft. I believe the Hornby 08 and certainly the Hornby class 50 have a similar design. Dapol on the other hand use circular bearings which although held tight in place by the plastic housing, could possibly have a tendency to rotate with the drive shaft if hot, thus contributing to the melting process. I can only assume this may have happened. Either way, the new bogie is now in place and D1000 is happily now back in service!
If you can't see the bright side of life, polish the dull side!
The one photo I have seen of an Accurascale mechanism, the general arrangement looked like that of the Hornby Brush 2 mechanism, particularly the clip on cover over the top of the gear tower which retains the bogie in the chassis block; I think this particular method originated with Athearn.
Interesting information on the Dapol bearing. Thus far the Dapol NBL type 2 has been a perfect performer, so I won't go poking around! (It's duties are very light, five BR mk1/Gresley/Thompson non gangwayed, occasional ECS inner sub area ECS moves, no sustained running at speed.) And should there ever be a truly significant problem I now have one of the first Bach 24 mechanisms in the reserve stash; very easy to adapt to fit within the NBL body, and proven bombproof.
