Hi Greg,
I have recently had the same problem with 2 X C3's the same
vintage, but with underlever problems as you describe. Removal of the pins
showed signs of scoring, and some of the red dye from the bushing cloth had
actually stained the pins.
One of the pianos had been treated with both protech, and
alcohol/water/lanolin, by another tech to no avail. These pins look as if
they were plated, and the plating is starting to fail.
The ONLY solution in this case is to ream 2 sizes over to clean the
bushing, and repin. The problem is very common on one of the Korean Mfgs
Pianos.
Bite the bullet, get paid, and save on the recalls.
Regards Roger
> My questions to you good people out there are: Have any of you found
>a common problem with the Yamaha grand that would fit this picture? If
>so, what did you do about it? Mark Wisner thought that perhaps Yamaha
>used a Silicone oil substance years ago for lubrication of centers. I
>assume this was on an as needed basis. Anybody confirm this? If these
>are contaminated would repining be a viable solution? Would replacement
>be better? My customer is convinced (his own thoughts) that replacement
>is better. Are we on track or all wet? Any thoughts why I would see this
>rearing it's ugly head now and I noticed practically nothing only 6
>months ago when I regulated it? It seems such a night and day difference
>between well functioning and impossible repetition. If Yamaha convinces
>my customer that the sizing solution is the way to go, how long can we
>expect it to last?
> The customer will be calling Yamaha to talk with someone himself. He
>wants to know their mind on the subject. I hope some of you can shed
>some light on this one too. I seem to find some weird pianos to work on
>some times. Thanks again!
> Greg Newell
>
>
Roger Jolly
Balwin Yamaha Piano Centres.
Saskatoon/Regina.
Canada.
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