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W9 compression tester


 
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Frank Caldwell
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Joined: 05 Mar 2009
Posts: 53


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PostPosted: Tue Oct 09, 2018 2:36 am    Post subject: W9 compression tester Reply to specific post Reply with quote

The spark plug hole on my W9 is larger than the plug in on my
compression tester. Does anyone know where I can get the proper
thread size?
 
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DeltaRed
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Joined: 25 Feb 2010
Posts: 14950
Location: Delta,colorado

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PostPosted: Tue Oct 09, 2018 5:26 am    Post subject: Re: W9 compression tester Reply to specific post Reply with quote

There is an outfit that makes adapters. don't remember who....Or,make your own. Break the porcelean center out of an old plug.Braze a fitting of the correct thread size to that old plug. BTDT. Easy.Or visit a local machine shop. a machinist can easily make you one on his lathe.
 
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sunsettractor
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Joined: 18 Mar 2009
Posts: 193


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PostPosted: Tue Oct 09, 2018 4:51 pm    Post subject: Re: W9 compression tester Reply to specific post Reply with quote

I think the standard thread for an automotive type compression tester is 14mm, My h and O-6 international use a D-21 Champion, which is 18mm thread, not sure what your W-6 uses, but once you have verified the thread size of your plug, and your tester, you can purchase the correct size adapter from brillman.com, they ship pretty fast...Tom
 
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rustred
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Joined: 01 Jul 2009
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PostPosted: Tue Oct 09, 2018 5:39 pm    Post subject: Re: W9 compression tester Reply to specific post Reply with quote

the W9 can have either the 18mm plugs or the early w9's had the 7/8 plugs which is the W series in the champion line instead of the D series.
 
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