Problem with a Hornby Bulleid

[tyl59]

Hi

 

I have on the workbench at the moment a Hornby R2585 West Country 34045 Ottery st Mary,

 

I've managed to get it running again, (it was in a very bad state) but the rear driving wheel set jumps at a certain point every revolution, the front two are unhindered, the rear axle is driven by the con rods from the front two sets of drivers.

 

Having taken it apart again I cant see anything which may be causing it, it sounds like the wheel sets have a flat at high speed, but they've just been replaced by new ones direct from Hornby, (the originals had moved on the axle and had lost quartering and the ability to stay in gauge!)

 

A small YouTube video is linked. its noticeable for what its doing at slow speeds yet noticeable by sound at high speeds.

 

 

the video is unlisted so only by clicking the link you should be able to see it.

 

at the top left (10-11) there is a small jump, 

 

any ideas what may be causing this is greatly appreciated

 

Many Thanks

[PhilH]

Sounds like the common WC split gear syndrome. I have 4/6 suffering from same problem. Well known, well documented, only solution if it is that is to replace offending gear.

[tyl59]

I’ve taken all the gears and checked it. It’s just the rear wheel jerking. Take the conrods off and the rest are completely smooth.

 

One gear was replaced. As it was loose on the axle and not turning.

[DCB]

Looks to me like the trailing coupling rod is too long and or the quartering is out, more likely the rod, maybe tweak it with needle nosed pliers, straighten to lengthen or increase the mount of bend to shorten.

[tyl59]

Hi

 

I've tried straightening and bending them, all to no avail. still a jump in the movement.

 

any other ideas?