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Spark Plug Gap Tool 3D Printer File Image 1
Spark Plug Gap Tool 3D Printer File Image 2
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Spark Plug Gap Tool

Weasel avatarWeasel

June 27, 2025

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DescriptionCommentsTags

Description

A tool to assist in gapping spark plugs.  Simply load the spark plug in and apply pressure using the dial until the proper gap is verified with a feeler tool.  I have a list of known working spark plugs below, but any similar 16mm spark plug should fit. If you verify it works for another and you put it in the comments I will add it to the list. 

Be sure to glue the dial together once the bolt is loaded in.  Same for the bolt to the gapper tool.  You can try a press fit, but I am not sure how long it will last before slipping free.

Parts Required:

1 M6x35 (or larger) bolt

1 M6 nut

This is a remix of the following two projects:

https://www.thingiverse.com/thing:5181050

https://www.printables.com/model/192794-m6-male-knob/files

Print Settings

Printer Brand:

Creality

Printer: 

Ender 3 S1 Pro

Material: 

PLA

Rafts:

No

Supports: 

No

Resolution:

0.2

Infill: 

20

Spark Plugs Confirmed To Work:
Motorcraft CFS12YPCT
NGK ILTR6R8G
NGK LTR6IX
NGK LTR71X-II
Denso ITV22

License:

Creative Commons — Attribution — Noncommercial

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