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Thead Chaser

  • jaybhansen
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3 months 6 days ago #21483 by jaybhansen
Thead Chaser was created by jaybhansen
for 912ULS. I have a plug hole where the first couple of threads are just not right. I was told I can use a chaser. If I do, how do I keep the metal shards out of the cylinder?

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3 months 4 days ago #21500 by RobSeaton
Replied by RobSeaton on topic Thead Chaser
I have heard of using a vacuum:Reduce the hose OD with an adaptor (make out of wood) with a small flexible hose run into the cylinder from the other spark plug hole.

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  • DHeal
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3 months 4 days ago - 3 months 4 days ago #21503 by DHeal
Replied by DHeal on topic Thead Chaser
Use the positive pressure side (outflow) of your vacuum to blow into the opposite spark plug hole or use compressed air. Also, use some grease on the chaser to hopefully capture any shards or debris.
Last edit: 3 months 4 days ago by DHeal.

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  • kenryan
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3 months 4 days ago #21504 by kenryan
Replied by kenryan on topic Thead Chaser
This probably goes without saying, but if you use a vacuum to blow air into the cylinder, make sure it is clean air.

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3 months 4 days ago - 3 months 4 days ago #21506 by Roger Lee
Replied by Roger Lee on topic Thead Chaser
There is a difference between a 12mm thread tap vs a spark plug thread chaser. The tap has very sharp metal cutting edges and it will cut the threads and leave shavings verses a plug thread chaser that has a more dull rounded cutters that do more reshaping and conditioning than cutting. I would not use a standard 12mm thread tap. Apply a bit of white lithium grease to the cutter and it will work more smoothly, do a better job and catch any particles. Don't use it dry.
Use the right tool.
Like this:

www.tooltopia.com/lang-tools-1013a.aspx?...ZEAYYAiABEgJ5mvD_BwE

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 3 months 4 days ago by Roger Lee.
The following user(s) said Thank You: kenryan

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2 months 4 weeks ago #21553 by Kevin Stewart
Replied by Kevin Stewart on topic Thead Chaser
This is what I used: www.amazon.co.uk/Choice-Draper-XS17-2486...+thread+recovery+m12

You put it into the hole and gradually expand it, unscrewing it until you get the result you want. It doesn't create large shavings that fall into the cylinder as you can cut on the way out as it unscrews.

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2 months 4 weeks ago - 2 months 4 weeks ago #21554 by Roger Lee
Replied by Roger Lee on topic Thead Chaser
You're not looking for something with sharp cutting threads that removes material. The spark plug hole chase reshapes the threads and doesn't have the sharp cutting tap and all the shavings that go with it. You're not trying to remove material. Look at the thread chaser in the attachment in my post. You'll see the plug chaser has a more rounded type thread that does more reshaping and not cutting all new threads. You should lube the chase to.

p.s.
I word for the wise. Never force a plug in. If it starts to bind up STOP. Take it out and either re-align it or clean the hole threads.If you just have garbage in the threads you can use the plug chase to clean the hole threads.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 2 months 4 weeks ago by Roger Lee.

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