What's new
By:
Pinball info

Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

Must a coil always have a sleeve?

Andy B

Andy B

Site Supporter
1 10 Years
Joined
Oct 6, 2014
Messages
1,424
Location
Hull. England.
I am repairing a Rocky and Bullwinkle for a mate - that is used in his arcade so ALWAYS has issues!

I'm having a problem with a Super VUK. I replaced the coil with a new one a month or so back because it was stuck on. Replaced the transistor and pre-driver at same time. Sometimes the switch for the Super VUK is not registering because the plunger is not being taken all the way down by the weight of the ball - the plunger is real tight in the sleeve.

My question is does a coil sleeve always need to be used in a coil?

When I bought the replacement coil for this SVUK - it came with a coil sleeve pre-installed (more fool me for not taking note of whether the old one did or not!) so I just installed it as is. However I just looked at the manual now and the parts diagrams are not showing a coil sleeve on the VUK or Super VUK (and quite a few of the other coils also) though they do on many of the other coils - but I know how unreliable manuals can be!

Will I do any damage if I don't have a coil sleeve in this coil - I have a feeling the plunger would more freely move if there was no sleeve in.

Thanks

Andy
 
Andy B said:
I am repairing a Rocky and Bullwinkle for a mate - that is used in his arcade so ALWAYS has issues!

I'm having a problem with a Super VUK. I replaced the coil with a new one a month or so back because it was stuck on. Replaced the transistor and pre-driver at same time. Sometimes the switch for the Super VUK is not registering because the plunger is not being taken all the way down by the weight of the ball - the plunger is real tight in the sleeve.

My question is does a coil sleeve always need to be used in a coil?

When I bought the replacement coil for this SVUK - it came with a coil sleeve pre-installed (more fool me for not taking note of whether the old one did or not!) so I just installed it as is. However I just looked at the manual now and the parts diagrams are not showing a coil sleeve on the VUK or Super VUK (and quite a few of the other coils also) though they do on many of the other coils - but I know how unreliable manuals can be!

Will I do any damage if I don't have a coil sleeve in this coil - I have a feeling the plunger would more freely move if there was no sleeve in.

Thanks

Andy
Click to expand...
There should be a sleeve afaik.

The plunger should absolutely be free moving with a sleeve installed.

A shorting/ overheating coil that warps the sleeve would cause this but you said this is new coil ?

Is the plunger def the correct part ? Try another sleeve ?
 
Sgt GrizZ said:
There should be a sleeve afaik.

The plunger should absolutely be free moving with a sleeve installed.

A shorting/ overheating coil that warps the sleeve would cause this but you said this is new coil ?

Is the plunger def the correct part ? Try another sleeve ?
Click to expand...

Yep - brand new coil.

Don’t have any spare sleeves - that’s why I was asking if I definitely needed one - didn’t really want to put an order in just for a sleeve and I just know if I go on the websites just to order one I’ll go and spend a bunch more money 😊

That’s a good point about the plunger and got me thinking - I think the end fell off the old one and I had a spare lying around which looked the same. I guess the diameter of the spare I had could have been greater than the original…
 
The plunger may be original and has mushroomed (it's not just the end stops that are capable of this). I've also known new coils to be incorrectly sized (eg. too tight like you've found) due to acceptable (or not) tolerances or have missing notches, wrong shape, etc.
 
Moonraker said:
The plunger may be original and has mushroomed (it's not just the end stops that are capable of this). I've also known new coils to be incorrectly sized (eg. too tight like you've found) due to acceptable (or not) tolerances or have missing notches, wrong shape, etc.
Click to expand...

I’ve ordered a bunch of different sized sleeves - a new plunger and a new coil.

You can never have enough spares right 😊
 
Did your sleeve have an extended flange at one end. Your sleeve should be a 03-7067 variant not a 03-7066. If you don’t have the flange the coil will not be centred and the plunger will rub against the bracket. All coils have a sleeve.
 
pinballmania said:
Did your sleeve have an extended flange at one end. Your sleeve should be a 03-7067 variant not a 03-7066. If you don’t have the flange the coil will not be centred and the plunger will rub against the bracket. All coils have a sleeve.
Click to expand...
Thanks for answering the question as to whether a coil always needs a sleeve Andy.

I don’t think the sleeve had an extended flange.

I’ve ordered a new coil and some 03-7067 and 03-7066 sleeves from you today as well as the other SVUK coil bits - good to know which sleeve I should insert.

Cheers

Andy
 
pinballmania said:
Did your sleeve have an extended flange at one end. Your sleeve should be a 03-7067 variant not a 03-7066. If you don’t have the flange the coil will not be centred and the plunger will rub against the bracket. All coils have a sleeve.
Click to expand...
Oh my god you just solved the dodgy kickout on my AFM vuk.
I was only looking at it earlier and confused by where the friction was coming from, only to browse the forum and see this in passing 🤣
I had wondered the importance of the flange.
 
You must log in or register to reply here.
Back
Top Bottom