Adjusting speeds on COPAL MXV YASHICA shutter : Which screw?

[Gritycityflicks]

Let me just clarify this. Dose the arm on the slow speed assembly need bending? do you need to loosen any screws? One write up i was reading was describing loosening a screw and pushing the assembly towards the shutter but now it seems that is not the case, you just bend the arm either way depending on slow or fast.

Thanks for the heads up on the focus cam Dan. The covering came off fine when I first checked this camera over. I would love for the focus arms to run smooth so I think I will have another look at them and try to fiddle with the bearings/springs before doing a whole clean and re-lube. See if it works by keeping it simple. If not, and I have the whole lens board, hood and mirror already removed wold a good flushing be a viable idea. Anyone done this? (can you tell that I really dont want to take out all those cogs?)

[John Koehrer]

You cannot write up a repair ticket if it says "bent or bending" it's "reforming" costs more.

[Dan Daniel]

I don't see any elongated holes that allow for repositioning the escapement. Leave the screws alone. Bend (uh, reform) the arm as shown in kerne's photo. Was just fixing a D for someone today and this method works like a charm. I put a small screwdriver in the slot and twisted it ever so slightly to move it out. Needle nose pliers to bring it closer. Very slowly, softly.

Loosening a screw and sliding the escapement back and forth is standard technique for Compur shutters.

Looking at the drawings referred to yesterday reminded me- there is only one adjustable bearing on the focus system for Yashicas. Open the non-wind/focus side first and you'll see that on the front side of the focus rail is a tab of a red material that rides on a cam. On the other cam, it is a small 'dot' of red material emerging from a small tube formed in the end of a small bracket. This is to the back side of the cams.

See if this is the source of the slop. When I have reinstalled focus rails in the past, I have ended up pushing that bracket for the back bearing hard forward. There is a spring in the tube pushing the bearing material, so maybe there is more adjustment room than I realize.

Vertical motion, hard to imagine it going out.

The grease can become quite a challenge to clean out. And on the focus axle, there is a grease groove at each 'end' where it goes through the mirror chamber. Yould need to remove the axle to clean this and replace it. The one time I did that with a 1950s Yashica-Mat, things got worse so I don't bother any more.

[Gritycityflicks]

Right, iv done it!!!!!!!!!
With the aid or a small pair of pliers I just bent the little arm slighty in the 'faster' direction to enlarge the gap. You could also use a small screwdriver if you were to place it in the groove and twist. You dont need to bend it much to hear the results and after bending it back a tiny smidge, the shutter is firing at the same speeds as the other MXV/Nikon.
I had a bit of trouble fitting the shutter unit back together but that was mainly caused by not understanding how the speed cam detent spring was supposed to sit. Also that the pin for the 'bulb' setting has to sit in its groove. Anyway after a bit of fiddling and figuring its all sorted.

Thanks for that picture Kerne, it really helped.

Now I think it would be rude to not clean out and re-lube the whole focus mech as it could be a whole lot better. Im doing a run through on my spares/repair Yashica that I got for a fiver. So far so good, I have the focus knob side all out and soaking in lighter fluid before wiping off the caked on grease. The other side looks even simpler. The cogs just seemed scary but did have much to say when it came to taking them out.

Thanks for the help folks. Your amazing. With an extra bit of luck and elbow grease I might even get my spares model to become a fully working Yashica. Mark Hama very kindly sent me some new screws for the focussing arms. The man is a saint. My hat goes off to him

[Gritycityflicks]

need sleep. just re read that post and didnt notice the screwdriver tip had been mentioned. Plus il look out for that red tab thing Dan.
Right, bed time

[Gritycityflicks]

Hey Dan it sounds like you have cleaned out quite a few Yashicas. I wanted to ask about re greasing the focus mechanisms. Where should I be greasing or dose everything need a little dose? Also what is the basic procedure for re-setting calibrating the focus rails. I have a few ideas on how it should go but a bit of your knowledge to fill in the blanks would be great.
Cheers