How would you try and save this coil

mirage · Nov 22, 2019

I got a old Titan chainsaw that I am working on. Piston is stuck . Working on that. Got the ignition off the saw . The coil has cracks in it. Is there any trick stuff that I can coat it with. I don't know if the coil is any good. How about cleaning it before I try to coat it with anything?

Dub11 · Nov 22, 2019

I think I've seen @sawnami post some old coil tricks.

mirage · Nov 22, 2019

Maybe he will point me to the info

Mastermind · Nov 22, 2019

This thread needs to be in the general saw forum.

It's something we can all learn from.

Is it ok if I move it?

mirage · Nov 22, 2019

go for it

Basher · Nov 22, 2019

I have coated a few with JB Weld, it has sealed them up good, kept out moisture and they are still making spark 7 -8 years later.

Mastermind · Nov 22, 2019

Basher said:
I have coated a few with JB Weld, it has sealed them up good, kept out moisture and they are still making spark 7 -8 years later.

How would you degrease it Jerry? I've been thinking about a good way to do that, but haven't really come up with anything.

rogue60 · Nov 22, 2019

I've used Araldite and tried fiberglass resin on it's own without the fiberglass on old coils like this.

Both have worked good for what I was doing sealing up and old coils the resin seemed to handle heat better than the Araldite.
Is there something better? probably that's just what I've used before.

As for cleaning that's the easy part if you don't have a can of this on the shelf somethings wrong lol

beaglebriar · Nov 22, 2019

Flammable brake cleaner would be my go to for cleaning it up. Then I'd try coating with Seal-All, it's pretty good stuff.

TreeLife · Nov 22, 2019

I would use electrical connection cleaner, and probably an epoxy rated for use with heat and petroleum.

Basher · Nov 22, 2019

Mastermind said:
How would you degrease it Jerry? I've been thinking about a good way to do that, but haven't really come up with anything.

I used brake cleaner on mine, gave er a very good and heavy dousing, let the contamination run out of the cracks, put the coil in a little toaster oven and heated it for a half hour, then applied the JB. Old Pioneer coils were notorious for cracking on the NU17, 400, 450 and some of the bigger cube saws.

Terry Syd · Nov 22, 2019

If the coil is bad, then you can likely find a place that will re-wind it for you. I used to re-wind various bike coils to give a bit more juice for starting. Sometimes just 10% more wire on the coil would make a huge difference.

fossil · Nov 22, 2019

@67L36Driver has done some like that. Lots of guys coat them with liquid electrical tape. The stuff works well.

Basher · Nov 22, 2019

fossil said:
@67L36Driver has done some like that. Lots of guys coat them with liquid electrical tape. The stuff works well.

View attachment 209042

I may try this stuff on the next repair, does it harden up or stay gummy?

Mastermind · Nov 22, 2019

Excellent thread !!!

67L36Driver · Nov 22, 2019

Basher said:
I may try this stuff on the next repair, does it harden up or stay gummy?

Cures out to medium rubber ‘soft’.

Don’t use it iffin you be pregnant. Make your baby look strange. [emoji2960]

Larry B · Nov 22, 2019

I would clean the coil with brake kleen and dry well and then use an acrylic conformal coating spray.

mirage · Nov 22, 2019

I think I like the electrical tape. Looks like it will go into the cracks.

TreeLife · Nov 22, 2019

You have me intrigued with the liquid electrical tape!

mirage · Nov 22, 2019

Terry Syd said:
If the coil is bad, then you can likely find a place that will re-wind it for you. I used to re-wind various bike coils to give a bit more juice for starting. Sometimes just 10% more wire on the coil would make a huge difference.

To re-wind the coil don't you have to brake the outer shell off ? If you do do they just dip it in some type of compound?

How would you try and save this coil

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