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Figuring out what's wrong with shutter (Yashica-Mat LM)

Started by Brownman, Jul 01, 2010, 02:22 PM

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Mareklew

Jul 09, 2010, 04:29 PM #30 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
The only thing I'd do to the escapement at this point is to inspect it very close for any foreign objects - hair, piece of wire, etc - that might be tangled between the teeth.
Also, have a look if the pin 8 really moves gears around. I'm not

Donyet

Jul 11, 2010, 04:15 AM #31 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hello Marek,
 
Here is the report so far.
 
The good news is the shutter itself has come back to life after 48 hours in lighter fluid.
 
I found the problem with the retarder as well. I found the gear that is jammed. Even after 24 hours i

Mareklew

Jul 11, 2010, 11:11 AM #32 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
If I remember correctly, this gear moves on an axle (i.e. it has a hole in the middle), as opposed to other gears, that move with their respective axles set in bushings. If it is so, then I'd say, that's the reason: contact are

Donyet

Jul 12, 2010, 04:47 PM #33 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hi Marek,
 
I'll place the escapement in WD40 for a few days then back into solvent to see if that loosens anything before resorting to disassembly.
 
Thanks,
Alex

Mareklew

Jul 12, 2010, 08:08 PM #34 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
I'd mix some solvent with this WD40, something nasty, go to the next car shop and ask for brake cleaner, ask for something made for workshops and not for ladies, if you have choice opt for the chlorinated environmentally unfriendly version (uses

Donyet

Jul 13, 2010, 12:42 AM #35 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hi Marek,
 
Tetrachloride is illegal in this part of the country, so I'll be trying something else. I'll take a look at what the local auto repair place has handy.
 
Thanks,
Alex

Mareklew

Jul 13, 2010, 08:53 AM #36 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Then get either the revised-formula non-chlorinated brake cleaner, or the carb cleaner, they both are meant to remove stubborn stuff without eating aluminum, brass or steel.
 
Pity about banning tetrachloride. As with many other chemicals I'd

Donyet

Jul 14, 2010, 05:20 PM #37 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
I disassembled the retarder briefly to see if I could loosen the gear. It is still immovable, you would think it was welded on by how jammed it is. I re-assembled the retarder while I had everything fresh in my mind. At least I know how to do it and I m

Donyet

Jul 16, 2010, 12:19 AM #38 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hi Marek,
 
It is currently sitting in what is sold here as brake cleaner. Even though it is not chlorinated, it still sounds like pretty nasty stuff. The ingredients include Acetone, Heptane, Methane, Toluene, and Carbon Dioxide.
 

Mareklew

Jul 16, 2010, 06:04 PM #39 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
You are welcome, glad to see you progress!
 
If brake cleaner won't get it to move, I'd try getting a pair of rubber gloves and twisting the gear gently there and back, payint attention not to bend the lever and pin the gear is mounted on.

Donyet

Jul 17, 2010, 04:30 AM #40 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hi Marek,
 
Here is the latest report. I was successful in loosening the gear. There was some orange colored substance cementing it to the pin, possibly rust or old grease/oil. I put the retarder back together and put it back into the shutter. I

Mareklew

Jul 17, 2010, 07:37 AM #41 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
The problem you are encountering is most likely related to the release mechanism still having gunk in it. When you press the release button you trip the delay timer for magnesium flash (the delay escapement is locked when you set it to X, but the levers

Donyet

Jul 18, 2010, 05:43 PM #42 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Sounds good. I will do that.
 
Thanks,
Alex

Donyet

Jul 18, 2010, 09:27 PM #43 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hi Marek,
 
The shutter is working in all settings now!
 
Now that everything on the shutter is working, I have yet to lubricate anything. To which points should I add the fine watch oil? Will I need any other oil or dry lubricant?  
 
T

Donyet

Jul 18, 2010, 09:34 PM #44 Last Edit: Sep 20, 2024, 01:00 AM by smf_adm
Hi Marek,
 
The irony is that while testing out the now working shutter, the cocking lever jammed. I guess that's the risk I take in restoring a camera that hasn't been used for 40 years.
 
I removed the front of the camera to isolate th