Fitting a Terrier with DCC

QUOTE (Mike Button @ 6 Sep 2007, 21:48) <{POST_SNAPBACK}>The problem is the noise, when it's idle no noise, but running even at low speed it makes a racket, the more speed applied the greater the volome. Is this normal with this type of loco or have I done something wrong? I took the capacitor out when I fitted the chip, would reinstalling it help?
Thanks for your advice,
Mike
Is it the motor or a mechanical noise? something might have been displaced when you had it apart.
If it's the motor it could be the frequency setting on the chip making the motor noisy. I'd suggest contacting Hornby direct and ask if they have tried their chip on this motor. If you have access to a programmer and you know the Hornby CV for motor frequency you can try adjusting that to a higher frequency. But ask Hornby first as they are very helpful usually.

My father has a Hornby Terrier - it's always been a smooth but noisy runner on DC

Mike

No need to replace the capacitor. The 'type 7' motor runs silently and very controllably with a high frequency back-EMF decoder from the likes of Lenz or Zimo.

Thanks for the help everyone, the noice is motor not mechanical, the loco runs very smoothly no complaints there, it just whines whilst running, the greater the speed the higher the whine. I took the body off and detached the decoder from the motor and this cured the whine, toruble is there's very little room in the body for the decoder to go so it has to fit snug against the motor. As soon as I put the body back on and screwed it together again the whine was back. Any further suggestions?
I will contact Hornby and see what they suggest, sorry not sure what a CV code is or how to change it, don't forget I'm very much DCC for beginners!
Thanks again Mike

QUOTE toruble is there's very little room in the body for the decoder to go so it has to fit snug against the motor. As soon as I put the body back on and screwed it together again the whine was back

is the decoder pressing hard enough to cause part of the motor armature to rub against a casing?

will there be high frequency motor vibes being transmitted through the decoder if it is in hard contact with the motor?

Hi

I have got one of these Terrier too but I have not got around to putting in decoder. Any chance of a photo and description of where you mounted the decoder.

Hi sorry I've not replied, PC troubles. I don't think the decoder is causing the motor to press against the casing, but the idea of moving the decoder to the coal bunker is appealing. Yes I'm using Hornby decoders.
I've tried putting pictures on here before but without success, I followed the instructions in the Peco book, I think it's called "installing locomotive decoders" but I haven't got it to hand to check.
Basically you detach the three wires from the picks ups on the axles, (red, yellow and black wires) from each side of the motor, group the three together and attach the black decoder wire to one set and the red decoder wire to the other. The orange and grey go to the motor terminals as usual.
The instructions place the decoder on the side of the motor, (use double sided tape). I've never placed a decoder so close to the motor before, and as you will appreciate I'm not happy with the result.
I'll look at moving it to the bunker at the weekend.
Thanks again for your help.
Mike

Try the following link - http://www.bromsgrovemodels.co.uk/hornbyclassa1xdccinstr.htm

Regards

John R
Bromsgrove Models