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Tricky stuck rotor problem
Posted: Mon Apr 23, 2007 2:40 am
by Wilco
I do some cleaning and light maintenance for my band and I got a french horn with a frozen stop-valve (yamaha 321). I assumed it was caused by lime, etc. but....... When I removed the rotor and cleaned the casing and the rotor with vinegar it still dragged. To my surprise the valve knuckle had come a bit loose and a part of it extended into the valve casing...... and that was causing the drag. I suspect the knuckle suffered a blow.....
The question: is this a tricky repair job?
btw, I'm not planning to do it myself (no way)
Posted: Mon Apr 23, 2007 3:59 am
by pulseczar
Disclaimer: I'm not a professional, but I do work in a repair shop.
It depends on the expertise of the repairman and the tools available in the shop. IMO it's not tricky. The worst that could happen is casing is lapped.
Re: Tricky stuck rotor problem
Posted: Mon Apr 23, 2007 10:48 am
by Dan Schultz
Wilco wrote:I do some cleaning and light maintenance for my band and I got a french horn with a frozen stop-valve (yamaha 321). I assumed it was caused by lime, etc. but....... When I removed the rotor and cleaned the casing and the rotor with vinegar it still dragged. To my surprise the valve knuckle had come a bit loose and a part of it extended into the valve casing...... and that was causing the drag. I suspect the knuckle suffered a blow.....
The question: is this a tricky repair job?
btw, I'm not planning to do it myself (no way)
If you mean that the knuckle itself has become unbrazed or has broken from the rotor housing... yes... it is a tough repair job. It's doable but it would be much better to just replace the whole rotor assembly.
Re: Tricky stuck rotor problem
Posted: Mon Apr 23, 2007 12:08 pm
by Wilco
TubaTinker wrote:Wilco wrote:I do some cleaning and light maintenance for my band and I got a french horn with a frozen stop-valve (yamaha 321). I assumed it was caused by lime, etc. but....... When I removed the rotor and cleaned the casing and the rotor with vinegar it still dragged. To my surprise the valve knuckle had come a bit loose and a part of it extended into the valve casing...... and that was causing the drag. I suspect the knuckle suffered a blow.....
The question: is this a tricky repair job?
btw, I'm not planning to do it myself (no way)
If you mean that the knuckle itself has become unbrazed or has broken from the rotor housing... yes... it is a tough repair job. It's doable but it would be much better to just replace the whole rotor assembly.
Yes, a part of the knuckle has become unbrazed.....