compression tester adapter

[prkaye]

My compression tester has a threaded end that screws into the 18mm aviation plug hole. Does anyone make an adapter that would allow the compression tester to screw directly into an a 14mm auto-plug hole? So an adapter that has 18mm female on one side and 14mm male on the other side...

 

[Auburntsts]

If you can take the spark plug end off the extension, then you might be able to use this for parts https://aircraft-tool.com/shop/detail.aspx?id=14MM if not, then it might be easier to just buy a 14mm extension https://aircraft-tool.com/shop/detail.aspx?id=14MM-XT

 

[gasman]

You are running Lightspeed ignition. It should be using the top plugs... 14mm.

And a mag using the 18mm plugs on the bottom. Take compression from the bottom plug holes..... far easier access.

 

[Ironflight]

I’ve got two of these - one in 14mm, one in 18mm (here’s the 14mm):

https://aircraft-tool.com/shop/detail.aspx?id=14MM-XT

You’ll never need another compression testing spud again! (Oh…until your neighbor with a Rotax makes you get one that’s 12mm….)

 

[gasman]

You can make any adapter you need by just breaking out the porcelain of the plug. Remove the tip and weld on an air fitting or extension. Replace the copper washer with an "O" ring.

 

[gasman]

Be very careful of cross threading when using this tool, due to the extra leverage.