By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Myford Super 7 Back Gear / Reverse Levers

Disassembling the plungers.

All Topics | Latest Posts

Search for:  in Thread Title in  
Bob Johnstone25/11/2018 12:57:17
avatar
11 forum posts
34 photos

I've hit another snag in my Super 7 restoration, and wondered if the ME hive mind had any experience or suggestions.

I'm trying to take apart the plungers on the reverse tumbler and back gear levers, as they are both bent and don't 'plunge' freely. The exploded parts list shows the problem part to be H57 (A3021)- plunger, but these are held in by two screwed bushes (H59). Now, I can make the new plungers, if I could only unscrew the collars, which have seized over time (and abuse).

problem.jpg

Does anyone have a good idea of how to undo these things? It looks like they've already been beaten on with a screwdriver in their past, and I'm reluctant to do that again for fear of making the damage worse.

Is there a special tool, Myford proprietary or otherwise, that I should be looking for? Or do I have to customise something out of tool steel that I can pound on with the impact driver? Surely the factory had to have something to put them in with in the first place?

Any ideas guys?

mechman4825/11/2018 13:48:02
avatar
2663 forum posts
410 photos

FWIW... Make up a 'driver' from some MS tubing that is a neat fit over the plunger, with two prongs that fit the bush slots, apply some heat & see if the bush starts to turn, if so then work the bush back & forth to gradually ease the threads until you can unscrew it fully. It could be that with the plungers being bent they are impinging on the ID of the bushes forcing them against the internal thread of the levers, working the bushes loose would show if that is the case & you would have to try & straighten the plungers a little to allow the bushes to rotate around the plunger.

George.

daveb25/11/2018 18:02:20
621 forum posts
10 photos

If you take the levers off the machine and remove the knobs, the plungers and springs can be pushed through and a full size screwdriver used to remove the slotted caps. These screw down against a shoulder and are often very tight.

Bob Johnstone26/11/2018 16:24:03
avatar
11 forum posts
34 photos
Posted by daveb on 25/11/2018 18:02:20:

If you take the levers off the machine and remove the knobs, the plungers and springs can be pushed through and a full size screwdriver used to remove the slotted caps. These screw down against a shoulder and are often very tight.

I'm so glad there are smarter folks than me on this forum. I never thought to try pushing the plungers through. I thought they were captive. Once they were out, removing the collars was a 3 minute job with an ordinary screwdriver. Cheers Daveb!

Now it seems that I've got a bit of a Franken-Myford on my hands, as the plungers and collars are two different shapes and sizes, and aren't interchangeable between the levers, although the exploded parts diagram in the manual shows them as the same parts (and part numbers) in both levers. Makes no never mind, as I intend making my own new plungers to suit.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
cowells
Allendale Electronics
Eccentric July 5 2018
Warco
ChesterUK
emcomachinetools
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest