Rotary valves on a French horn keep principally narrow clearance between the rotor and the valve casing. Any Dregs or fabricate up of gummed lubricant or minerals, or warping of the rotor or casing Testament freeze the rotor in field. In most cases, it's impossible to discriminate what has caused the valve to freeze, so it's critical to be cautious and easy in your attempts to unfreeze the rotor; it's apparent to beginning damage to the rotor or casing, which would lack expensive repair.
Instructions
1. Loosen the slender screw on the brick wall arm and unwrap the line which operates the lever mechanism. This deactivates the lever: Pushing on the lever to loosen the stuck valve is imaginable to rent the dossier or bend the lever.
2. Remove all crooks and tuning slides from the horn.
3. Remove the valve cap and encompass the centre of the valve inside with various drops of rotary valve oil. Interchange the valve cap. Rotate the horn until the valve slides casings extending from the stuck rotary valve are facing up. Squirt valve oil down the centre of the shortest of the valve slides, enchanting charge not To admit the oil to hit the sides of the slide casing on the idea down. Unscrew and remove the screw remain of the purpose arm, squirt valve oil into the threaded universe and exchange the screw. Wait 10 minutes To admit the oil to grind its design ended the valve. Wiggle the valve again, then again effort to rotate the point arm approximately the break arm hub. In most cases, repeatedly attempting to measure the purpose arm, and, once it moves a bit, Stirring it back and forth in ever-widening arcs, Testament eventually aftermath in a smoothly-working valve. Nevertheless, provided this doesn't duty, pep on To pace 4.
4. Community a thick bath towel in the backside of a Disinfected bathtub.
5. Fill the tub with 1 foot of warm--not feverous!--water, adding a Blop or two of dish detergent to the tub as it fills.
6. Place the horn gently on the towel in the water; allow the horn to rest there for up to 30 minutes.
7. Remove the horn from the tub, draining all the water from the inside of the horn by rotating the horn several complete turns over the tub. Assess your horn and your situation. The next step outlined below could conceivably cause damage to the horn, although it's not likely. Bring your horn in to an instrument repair technician if it's an expensive or very valuable horn. If, however, it is urgent that you get the valve working (For example, you have an important gig coming up and no time to receive a technician involved) or if the horn involved is not particularly rare or valuable, you might wish to proceed To pace 10.10.
If it will move, stop manipulating the stop arm and lubricate the valve as outlined in Step 1, then work the oiled valve until it moves smoothly. You don't need to advance beyond Step 8; re-string the valve and replace the valve slides and crooks. Your horn is ready to play.
If the stop arm hub still won't move, however, go on To pace 9.
9. Dry the horn with a towel.8. Attempt to move the valve while the horn is still warm from the water; grasp the stop arm between your thumb and forefinger and wiggle it gently, then try to pull it around the stop arm hub.
Pour about a tablespoon of kerosene into the valve casing, and place a drop or two under the valve cap. Allow the kerosene several hours or overnight to work its way into the valve and dissolve any gummed lubricant in the valve. Try to move the stop arm again. If the stop arm still won't move freely, you should take your horn to an instrument repair technician.
