always clean and lube before determining if you need to adjust or not. Under here is the curtain tension adjust screws. Under here are the curtain tension adjust screws. …simply set the gear with the forks down back over the shutter release button rod and rotate it until it seats flush with the bottom. Remove the 4 screws (circled) gives access to cleaning gears on the shutter curtains.Īt the bottom of the curtain area I cleaned gears the best I could with lighter fluid staying clear of getting fluid on the curtains. use a 50/50 mix of household ammonia and hydrogen peroxide to clean fungus. I looked at it with a loupe and noticed spider web type fungus. Here, I cleaned the front of the VF/RF glass plates. lift the bottom first then slide up to clear the focus dial. Unscrew the 6 screws, (circled) the two at the bottom are longer. cleaning the optics is not that easy on the inside, basically I just did the external glass and the small mirror. at the other end of the cam it is in contact with the Horiz. the boxy part is the prism cover, nothing to clean under there, the red arrow points to the cam that moves as you focus the lens. clean with lighter fluid and give a tiny spot of grease on the lever at the contact point (at red arrow) clean all gears with lighter fluid, being careful not to let it soak down onto the curtains.
the crescent moon shape above the yellow arrow is the RF mirror housing. the red arrow points to the shutter closing curtain release lever, the closing curtain release cam is resting against it. the yellow arrow points to the lever that is in contact with the slow speed cam. Here is the inside of the top under the shutter speed dial area. see how it is graduated? that is why it is important that it goes back as factory set for proper slow speeds Here is the slow speed cam you marked with the sharpie. With the top plate removed, there is a spring under where the shutter release button was, take it off so you don’t loose it. it is not necessary to remove the advance knob or the accessory shoe Now remove the perimeter screws from around the top plate 3 in back and 2 in front (1 on each corner) then remove this screw in front of the accessory shoe.
On top of the slow speed dial, there is a split-ring, carefully remove it, don’t let it fly across the room. this is the slow speed cam that as you rotate the slow speed dial, it increases or decreases pressure on the slow speed linkage that is connected to the slow speed escapement, so this method will make sure you get it’s position back to factory setting on re-assambly With a sharpie, mark a dot above the set screws on the inner flange. I found it necessary to first advance the shutter. Unscrew guard (ccw) then with a gripper of some sort, unscrew the shutter button (ccw)įirst set the slow speed dial to 1/20, then lift the shutter speed dial and turn it until you can see the set screw in the slot (looking from backside) loosen but DO NOT remove the set screw. Put something in the forks of the rewind rod and unscrew (ccw) the knob on top. I’ve read that the Nikon One and Nikon M are similar except for the Accessory shoe does not need to be removed on the S. Also the film advance knob does not need to be removed, but for cleaning, simple loosen the set screw and unscrew the knob (ccw) remove rewind knob-1 Here are the simple steps to clean a 1951 Nikon S Rangefinder camera.