Rotor valve clicking

[ndh3425]

the rotor on my YBB-641 for my first valve keeps clicking. i dont know why. help...

[ndh3425]

Based on the particular model, one of these two things is probably the culprit.

less likely:
- The rotor is clean inside, but the back bearing plate needs to be driven home - as vertical play is causing the noise.

more likely:
- The donut-shaped elevated bearing surfaces inside the casing have a combination of lime/schmutz deposits, which have barely pushed the back bearing out. The rotor and bearing plate need to be removed, cleaned, and reinstalled...and the bearing plating then needs to be driven home to remove any vertical play - as vertical play is causing the noise.

this is a school horn. how should i tell my director to fix it

[roweenie]

Hmmmm....

If he's capable of fixing stuff, have him read what bloke wrote (he knows of what he speaks).

If he's not capable of fixing things, ask him if you can bring it to the repair shop that does routine maintenance on your school's instruments (which, basically, is what this is) at the district's expense.

Please forgive me for asking, but how do you expect to tackle a B flat to C conversion of a tuba, if you don't know how to perform routine maintenance/cleaning of a rotor valve? Just curious, that's all.....

[Rick Denney]

Another likely culprit with which I have recent experience is the stop plate, which holds the rubber stops and is fastened to the front of the rotor casing with two screws. If those screws are loose, clatter results. I dripped a lot of oil into various places before realizing what was making the noise.

Other possibilities include play in the linkages.

Rick "wiggle parts one at a time to find the culprit" Denney

[Three Valves]

Pistons, Baby.

Cure it with pistons!!

[ndh3425]

Pistons, Baby.

Cure it with pistons!!

im hunting for my own piston valve cc tuba

[ndh3425]

i was watching tuba dylan on youtube and he said bloke had these super duper rubber bouncy things that are supposed to help. is this a thing

[UDELBR]

One more possibility is the part where the linkage attaches to the spindle. It's supposed to be a friction fit atop the spindle, but doesn't fit tightly on some tubas, causing a metallic clacking sound when moved.