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Farmall & IHC Tractors Discussion Forum

W9 compression tester

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frank caldwell

10-09-2018 03:36:52

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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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10-09-2018 17:51:37

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 Re: W9 compression tester in reply to frank caldwell, 10-09-2018 03:36:52  
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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10-09-2018 18:39:09

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 Re: W9 compression tester in reply to sunsettractor, 10-09-2018 17:51:37  
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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10-09-2018 06:26:47

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 Re: W9 compression tester in reply to frank caldwell, 10-09-2018 03:36:52  
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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