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(Topic ID: 266201)

Coil Plungers - How Do I Clean Them

By Travlinsam

6 months ago

Topic Stats

  • 12 posts
  • 6 Pinsiders participating
  • Latest reply 6 months ago by Travlinsam
  • No one calls this topic a favorite


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There have been 6 images uploaded to this topic. (View topic image gallery).

Snap-Out Score Counter Unit Ckt Bd (resized).png
Circuit Board (resized).jpg
Broken Board 2 (resized).jpg
Broken Board 1 (resized).jpg
20200411_095453 (resized).jpg
Ball Return Switch (resized).jpeg

#1 6 months ago

I have a Bally "Old Chicago" pinball machine that I just purchased from a guy and it looks to be pretty original but really needs cleaning and a general "once over" since I just bought it.

When it comes to pins, I'm a novice and I really don't want to cause problems with it.

The big question I have, is what to use to clean the inner coil plunger for the flipper I take a Q-Tip and clean it with isopropyl alcohol or what?

Thanks for putting up with a new guy asking probably pretty simple questions.

Old Chicago

#2 6 months ago

You can take it apart and wash it with soap and water. Alcohol is fine if you’re just getting some of the dust off. The sleeves get replaced. Don’t lubricate them.

#3 6 months ago

Remove the coil and install a new coil sleeve and clean the plunger with alcohol. If there are any stubborn deposits I use fine steel wool with the alcohol. No sense just cleaning the plunger as you'll find the coil sleeve if full of the same gunk.

#4 6 months ago

Thank you! I'll give it a shot...I'll try and take some photos and post what I did (it might give yinz a good laugh)...

#5 6 months ago

Another quick question...I've searched all over but have not been able to find an image or drawing that shows how the "pivot wire" that is used to compress the switch by the ball should be positioned.

To me, this does not look correct and seems to be too "loose" for it to operate properly (or for that matter to compress efficiently). Can anyone out there provide (or direct me where to look) for an example image/photo that shows how it "should" be.

Thank you!!

Old Chicago

Ball Return Switch (resized).jpeg
#6 6 months ago

I clean coil plungers with lighter fluid first then with 99% isopropyl alcohol. If the plunger is chrome or nickel plated, then the final step is polishing it with Simichrome polish. It shines up like new that way.

Of course this all assumes the plunger is still in good shape and not worn.

#7 6 months ago

Here you go.

20200411_095453 (resized).jpg
#8 6 months ago

I usually course the plungers with alcohol and then polish them with Mother’s. Works well. Replacing them entirely works well, too.

#9 6 months ago

That's a great photo...thank you!

Digging a little deeper, I found a circuit board on the back that is broken. I'm still looking for a manual for my machine, so I'm not sure what this board is for.

Where is the best source to find replacement boards (if they are available) or is this something I'll have to figure out how to "fix"?

Old Chicago

Broken Board 1 (resized).jpgBroken Board 2 (resized).jpg
#10 6 months ago
Quoted from Travlinsam:

still looking for a manual for my machine, so I'm not sure what this board is for.

Where is the best source to find replacement boards

Manual and other documentation:

Boards are available. Once you figure out what board it is someone will have a source.

#11 6 months ago

Thank guys ROCK!!

#12 6 months ago

I went ahead and identified the circuit board and ordered it. (see image)
Circuit Board (resized).jpg

Snap-Out Score Counter Unit Ckt Bd (resized).png
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