Thead Chaser

Re: Thead Chaser

by Rob Seaton » 6 years ago

Rob Seaton

3 1.32k 251

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.

Re: Thead Chaser

by David HEAL » 6 years ago

David HEAL

23 194 444

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.

Re: Thead Chaser

by Ken Ryan » 6 years ago

Ken Ryan

28 372 993

This probably goes without saying, but if you use a vacuum to blow air into the cylinder, make sure it is clean air.

Re: Thead Chaser

by Roger Lee » 6 years ago

Roger Lee

131 5.38k 5.44k

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:

https://www.tooltopia.com/lang-tools-1013a.aspx?utm_source=google&utm_medium=cpc&utm_campaign=paid_search_google_pla&adpos=1o2&scid=scplpKAS1013A&sc_intid=KAS1013A&gclid=EAIaIQobChMI8OaluoTv3wIVwiCtBh12aAEZEAYYAiABEgJ5mvD_BwE

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Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Re: Thead Chaser

by Kevin Stewart » 6 years ago

Kevin Stewart

3 432 1.33k

This is what I used: https://www.amazon.co.uk/Choice-Draper-XS17-24867-Expert-Recovery/dp/B06Y1XXQK4/ref=sr_1_1?s=diy&ie=UTF8&qid=1548016490&sr=1-1&keywords=draper+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.