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Wheel back to back measurements

3161 Views 19 Replies 10 Participants Last post by  Thunder
When I completed the track laying on my fiddle yard, I noticed that two of the five locos I was using for testing where shorting my ECoS when travelling over points. Great I thought a problem with the wiring. Thankfully, the wiring appears to be ok. That leaves me to suspect the back to back wheel measurements as being a problem as the other three locos have no problems.

I then bought the C&L back to back gauge for 00:

However, I am not sure how best to use this gauge. I believe the measurement between the wheel backs should be 14mm, is this correct?

Also, is there an easy way to adjust this on locos or does it involve a complete dismantle to prise the wheels further apart?

Sadly I suspect this will be a problem with quite a few of my locos and I guess is an unfortunate side effect of DCC as it comes with the required better sensitivity of boosters that forces you to use best operating practises!

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QUOTE (Thunder @ 9 May 2008, 11:33) <{POST_SNAPBACK}>.. especially my bachman jinty, will not travel over this section of track work at slow speed with out stalling, ..
Before working on the track, check that all the pick up collectors bear properly on the wheelbacks. It's a rare RTR loco that has the pick ups as well set as they can be. If so inclined take off the keeper plate. You will see that the centre axle is on a sprung plunger; a useful feature, except that the keeper plate holds the axle rigid. If you make two semi-circular rebates in the keeper plate sides under the axle position, and a broader rectangular cut out under the plunger the axle will be free to travel downwards. Take a half millimetre off the top surface of the plunger if there is no upward travel as supplied. That should mean 5 out of 6 wheels available for current collection at all times. Many Bachmann 'blue riband' steam models have a sprung driven axle, and without exception to date all my examples have been supplied with the axle constrained to a near fixed position.
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