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Glow plug thread size? Building a compression tester.

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I'm going to make my own compression tester, Does anyone know the spec on the glow plug threads? Pitch and Diameter? Thanks.
 
M10 X 1. Maybe a bolt with a hole tapped into it for 1/16 NPT? Or maybe modify a bad glow plug? /forums/images/graemlins/thinking.gif
 
There is a guy on the diesel page who drilled out a glow plug and made a luminosity probe out of it. If he could do that I would think one could be made into a pressure tap.
 
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M10 X 1. Maybe a bolt with a hole tapped into it for 1/16 NPT? Or maybe modify a bad glow plug? /forums/images/graemlins/thinking.gif

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Did the glow plug thing.
Save your time and just buy the adapter from Matco for $15. The compression gauge and adapter run less than $80 IIRC. Wish I had went that route, would have saved lots of time. I bought my compression gauge from a parts store, don't recall the price. At that time I not even though about Matco, they are much cheaper than Snap-on for the compression gauge.
 
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Did the glow plug thing.
Save your time and just buy the adapter from Matco for $15.

[/ QUOTE ]

Ahh, I knew there was someone who went through this already. Thank you sir /forums/images/graemlins/thumb.gif Saved me some brain waves /forums/images/graemlins/histerical.gif
 
[ QUOTE ]
[ QUOTE ]
Did the glow plug thing.
Save your time and just buy the adapter from Matco for $15.

[/ QUOTE ]

Ahh, I knew there was someone who went through this already. Thank you sir /forums/images/graemlins/thumb.gif Saved me some brain waves /forums/images/graemlins/histerical.gif

[/ QUOTE ]

Harbour freight has a tester now on sale for under $150 and it has all the adapters to cover any diesel on the planet well at least for the Medium duty and down.
I got mine from napa for $300 and only has a couple adapters. /forums/images/graemlins/dunno.gif
I think I want to get this one just to have all the adapters.
/forums/images/graemlins/thumb.gif
 
Also need to point out that the new adapter I have gives 20-40 psi higher readings. Must have been the converted G/P I used did not have a large enough hole or high enough flowing check valve.
 

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