Author Topic: Sun Master Distributor Tester  (Read 3045 times)

0 Members and 1 Guest are viewing this topic.

Offline goodfellow

  • Hero Member
  • *****
  • Posts: 2042
  • Reputation: 364
Sun Master Distributor Tester
« on: September 22, 2009, 10:26:07 AM »
I found this model "MTD" in a garage in Pennsylvania. I always liked the "art deco" designs on Sun equipment beginning in the 1930's to the early 1950's; so I was looking for this particular model. It had been sitting unused in a locked garage for almost three decades

Here is the what it looked like when I got it home -- right off the truck

It's not restored, just refurbished. A restoration would be super expensive because many of the components are not generally available anymore -- nor are the silk screen masks for applying new letters and diagrams. Mechanically it's sound, and cosmetically it's "good" -- not "pristine". It still looks like it's been well used over the years.







I love the scroll with the old car specs (listed from 1925 to 1952)





The interior was a mess!! wires were rotted and the basic electricals were shot









BUT, some units were pretty good -- the vacuum pump just needed a good cleanup, new hoses and a new paper diaphram that I made out of gasket material. It has leaked oil everywhere. I guess someone overfilled the pump with oil at some point. It only needs a few drops every few weeks









The dwell/RPM meter was a different problem -- The pic shows that no matter what I did, the meter would not move over to the calibration line.
However, I found that a few leaky capacitors and a bad resistor on the meter kept the thing from calibrating properly. I finally repainted part of the housing to remove the battery acid stains (third pic)







I also painted the external cage and the backplate





Two modules finished



The turntable was a pain and in all my frustration I forgot to take pictures -- but it needed almost all it's capacitors replaced and most of the primary wiring harness replaced. The bearings were locked up with dry grease, but Kroil penetrant solved that problem and I was able to free them up after a few days of soaking. This is what I wound up with -- a refurbished and repainted turntable





The cabinet base was stripped and repainted a nice industrial grey color (Sun didn't do this to their machines -- so it's not really accurate, but it looks clean and tidy)



Beautiful GE 1/4 HP motor with "oil cups". After I cleaned and lubed this motor it ran so quiet that you almost couldn't hear it -- a true quality US made GE product. Sun used the best!!



The cabinet itself was stripped with 80 grit on a DA sander and the dents were pulled with a stud welder/puller. I filled some minor corner dents with a little Bondo -- it took a little over two weeks to do this project (worked everyday on it during my vacation)










Tools and Garages

Sun Master Distributor Tester
« on: September 22, 2009, 10:26:07 AM »

Offline Strobel

  • Newbie
  • *
  • Posts: 1
  • Reputation: 0
Re: Sun Master Distributor Tester
« Reply #1 on: June 26, 2017, 03:10:32 AM »
That's a great find Goodfellow, I used to have one just like this years ago. Do you still use it?

Offline goodfellow

  • Hero Member
  • *****
  • Posts: 2042
  • Reputation: 364
Re: Sun Master Distributor Tester
« Reply #2 on: June 27, 2017, 08:47:04 AM »
Yup -- it's still going strong. It will need a rebuild soon. The bearings in the driver unit are starting to make noise. Unfortunately I only have two cars left that actually use analog systems --

Offline Uncle Buck

  • Global Moderator
  • Jr. Member
  • *****
  • Posts: 97
  • Reputation: 32
Re: Sun Master Distributor Tester
« Reply #3 on: July 08, 2017, 01:08:01 AM »
I forgot what a thing of beauty that machine actually is!

Offline goodfellow

  • Hero Member
  • *****
  • Posts: 2042
  • Reputation: 364
Re: Sun Master Distributor Tester
« Reply #4 on: July 08, 2017, 04:23:20 PM »
I forgot what a thing of beauty that machine actually is!

It's a bit more worn than when this pic was taken Herb. Living in my garage for almost 10 years takes its toll on all things cosmetic. It will get a complete rebuild after we move to a new retirement home -- whenever that is -- LOL.