i have a speco oil pressure gauge that i want to put in to my sr. its the bulb type sender unit. i have a adaptor because the oil filter fouls on the sender. my problem now is that the adaptor doesnt fully srew into the block. its the same thread size as the factory unit. i have noctied that they all have a taper on the thread itself. i can only get about two turns into the block by finger should i just srew it in with a spanner??

graham

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It starts stops and steers. Who cares about indicators and a speedo.

Graham, post a pic of that adapter before you go any further.

There was three of these adapters ( that i am aware of)fail on the Datnat weekend.

I personaly was driving a car when the adapter just fell off.
fortunately it was seen & the guys stopped us before we got underway.

Just want to check the unit you have.

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"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT

Common thing in the US is most oil senders threads are 1/8 NPTF.
The Japs use the 1/8BSP(British Standard pipe) I believe its called.
So I have adapter to to plug in the block and it should go in alot farther before you put a wrench on it.
Mos t KITS do NOT have this 1/8 BSP thread adapters. I found some at one parts place But even the workers there didnt know they had it. They just showed me to the usaul Tawain Gauge kits saying thats all we got. My adapter is the 1/8BSP to 1/8NPTF(as most kits are 1/8NPTF) goes to a 90 bend adapter to a Autometer line(plastic). But a Copper line would be beater. Those cheap Taiwan lines are bad news and get brittle. Best to keep stock sender in car to plug up if line breaks. Mine broke just byslightly moving it out of way.During a oil change. Could not see crack untill car was started.

I see people here use the 1/8NPTF and then just wrench it ON. It goes in a little bit thinking, Hay it will work.

I dont know if this is your exact situation your asking about?

But this would apply to the water Temp sender in some kits also using the catapilley line. Not all will fit.

I was one of the ones Baz mentioned, my oil guage sender snapped off right at the end of the track day.

Banzai is correct, the thread you have is probably 1/8 NPT which is 28 threads per inch. The SR sender hole is 1/8 BSP which is 27 threads per inch. Don't force it in there, it's not going to seal properly. You can get a 1/8 NPT to 1/8 BSP adapter made up from places like Pirtek, but a much better idea is to make a remote sender block and run some braided hose to it. I can take a pic of my setup for you this afternoon if you like.

Basically you make a braided hose with 1/8 BSP fittings (I used Speedflow). Then get a piece of square bar about 20x20mm and about 100mm long. You then drill a hole through it lengthways (you may need to accurately measure and drill from both ends if you dont have a long drill bit). The drill a couple of holes on the side of the bar which break into the main hole you drilled first. Tap the holes to 1/8 BSP or NPT respectively then you can screw in the braided hose, the gauge sender and the SR factory idiot ligt switch. Finally you put a grub screw in the open end of the long hole to block it off. Hopefully that made some sense to you.

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1971 Datsun P510 SR20DET 276 rwkW
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1969 Datsun P510 L20B EFI 95 rwkW
1975 Ford XB Fairmont GS Wagon 179rwhp
1980 Escort Van SR20DET unfinished
2002 Suzuki GSX1300R Hayabusa 185hp

just to freshen things up. its a vdo adaptor. part number 230.031 that i have and yeah its about a "pooftinth" of an inch out. ?????? i dont dont know what to do.

i will go to pirtek i think

graham

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It starts stops and steers. Who cares about indicators and a speedo.

Chris/Hainz are right in what they've said. Normally the threads are so close it doesn't matter, and both my local fittings places said they just screwed them in there. I don't believe the different pitch is the issue.

The issue is the taper as you said originally. My Autometer oil pressure sender only went in 1/4 turn into my adaptor when I first tried it. I tapped out the block with a 1/8NPT die as mine didn't go all the way in. If you do this, don't forget to grease the tap so you get all the metal filings! You are not so much changing the thread (though that will happen) as you want to screw the tap in further to make the hole bigger.

Or just buy a 1/8 NPT die (good luck! I could only get a 1/8 BSPT and that one cost me a damn fortune) and die the end of the adaptor smaller.

Also don't forget there is not really any such thing as BSP, its either BSPT - British Standard Piping Taper, or BSPP - British Standard Piping Parallel.
If you are going to order a die you don't want the wrong one.

Dave

PS. Pipes suck.

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i have just installed a braided line from a swaglock 1/8NPT fitting into a mates 180 sr20. I just used a 1/8NPT tap that i filled with grease(to stop shaving falling into the block) and ran it through the stock sr BSPT thread. Worked a treat and i don't think any filing fell in.

[qoute]I tapped out the block with a 1/8NPT die as mine didn't go all the way in. If you do this, don't forget to grease the tap so you get all the metal filings! [/quote]

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Circuit Race 1600 in the build

i may just get a oil cooler for it........

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It starts stops and steers. Who cares about indicators and a speedo.