kv77
Part of things
Posts: 62
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Hi,
My '75 mazda, which was supposed to be metric all around, has gone imperial on me.
There's a blank plug in the manifold where i'd like to screw in a fan temp switch. The plug has a thread that looks like this:
- outer diameter 16mm to 16,65mm (tapered)
- pitch is 1,5, kindasorta
What kind of thread is this? Any chance that there are sensors on the market which have thread like this?
thanks
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<a href="http://retrorides.proboards.com/index.cgi?board=readersrides&action=display&thread=81096&page=1"> My 1975 Mazda 616</a>
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Probably some kind of hydraulic thread, sensors tend to have those kind of things.
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9 litre,2 speed,tube framed,alky burning...chevette
2002 merc sprinter (the bismarck)
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kv77
Part of things
Posts: 62
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I can screw an M16 sensor in there, but i'm worried it won't seal properly. And if i use thread sealer, I'm worried it won't ground properly
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<a href="http://retrorides.proboards.com/index.cgi?board=readersrides&action=display&thread=81096&page=1"> My 1975 Mazda 616</a>
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30psi
Posted a lot
Posts: 1,024
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Jun 13, 2011 14:26:17 GMT
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I'd hazard a guess and say 5/8UNF
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1962 Ford Thunderbird 6.4L
1981 Datsun Bluebird SSS CA18DET
1981 Datsun Bluebird SSS SR20DE
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,791 
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Jun 13, 2011 15:54:12 GMT
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Could be 5/8" JIC (18tpi). Certainly not BSP. Don't know about Metric tho
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lemon
Part of things
Gear head
Posts: 114
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Jun 13, 2011 16:18:55 GMT
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Very much doubt its tapered. Could be worn, but thats alot to be worn by, and it isnt the kinda thing to be screwed in and out more than once...
5/8 UNF my guess
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Last Edit: Jun 13, 2011 17:12:21 GMT by lemon
More than it should be, but not as much as it could be
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kv77
Part of things
Posts: 62
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Jun 13, 2011 16:54:58 GMT
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Yes, i figured it would be 5/8 something
It really is tapered, like some kind of pipe thread (JIC? NPTF?). An M16/1.5 goes in, but not all the way through. I can't find any sensors with tapered thread.
Thanks for your input, guys
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<a href="http://retrorides.proboards.com/index.cgi?board=readersrides&action=display&thread=81096&page=1"> My 1975 Mazda 616</a>
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,791
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Jun 13, 2011 17:39:58 GMT
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5/8" NPT doesn't exist, and never has according to my copy of 'Machinery's Handbook'
AFAIK JIC is the same as UNF but NPT is on it's own.
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