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Air Injection Bolt Size Help


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#1 mutantZ

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Posted 18 June 2016 - 07:37 PM

I cracked my air injection piping and I ass-umed that the bolts for the air injection tubes would be an easy find so I removed them. Does anyone have any idea what size they are? I found this thread on zcar, but the sizes that were listed was much too small.

 

http://www.zcar.com/...on-removal.html

 

I tried a 1/4 NPT steel fitting but it was much too small (diameter) to fit. I went to Lowes and the thread pitch seemed to match a 3/8 pipe plug, but it was a touch too wide. If the plug was metric I suspect it would've fit. Anyone have any ideas? I've tried a whole bunch of bolts with no luck. It's for a 260z manifold if that makes any difference. Thanks for any help.



#2 NewZed

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Posted 18 June 2016 - 07:41 PM

It's probably BSPT, British Standard Pipe Thread.  That's what Nissan used on many of the engine port threads, the oil pressure sender, for example.

 

http://www.ralstonin...and-bspt-seals/



#3 mutantZ

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Posted 19 June 2016 - 08:10 AM

Would you happen to know if they use metric sizing or is it still standard sizing?



#4 NewZed

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Posted 19 June 2016 - 08:33 AM

Standard.  British Standard.  Click the underlined blue letters.



#5 mutantZ

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Posted 19 June 2016 - 08:10 PM

Ah thanks! Hopefully I can get this thing buttoned up.






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