Oil Pressure sender thread Pitch?

[jdub]

NPT/NPS, M10x1, BSP/BSPT, and SAE (ex. 3/4 x 16) are all different thread forms, and generally incompatible with one another.

the block female threads were harsh on the adapter because the threads did not match. Properly matched threads should never be harsh to engage or tighten (with the exception of tapered threaded connections)

NPT and BSPT are both tapered threads, but the tapers are slightly different. As Ian said, they both seal on the threads.

Thank you sir, i new i wasnt off! Now try telling Figge that :biglaugh:

The mistake a BSPT is a metric thread is common...the major/minor diameters are often expressed in metric, as is the drill size. Read this:

http://www.britishfasteners.com/threads/bstp.html

 

[IJ.]

End of WW2 a LOT of Japan's industry was in ruins so they licence built cars and some were based on British models so they supplied the specs and tooling.

It took a LONG time before they standardised to Metric.

Have a look at the very early Japanese cars and they're just clones.

 

[TheNewRed]

You tried to screw an NPT adaptor into a BSPT hole and wonder why it didn't work?

NO NO NO, sorry i should have went more in depth. I tried putting a metric (as in m10x1) into one of the ports. I got the idea to use this adapter here http://www.supramania.com/forums/showthread.php?t=67665&highlight=temp+gauge+install

O, and thanks for the info guys, great material!!! So what route should we go, as far as adapters? i was thinking of just tapping the port i broke the adapter of into, with bigger NPT style threads.

 

[IJ.]

TNR: Now I'm really confused they're water fittings

 

[TheNewRed]

TNR: Now I'm really confused they're water fittings

HAHAH, in the first picture, he gives a variation of adapters, one being a M10x1. He then proceeds to say it can be used for the oil ports.

 

[IJ.]

He lied

 

[1-2clutch-u]

so im going to use a plat for mine lol

 

[spoolint78]

if your looking for the fitting i got a few spare ones I don't mind part with.
drop me a pm.

 

[bgim]

IJ - why not just redrill/retap the hole with a pipe thread that matches whatever aftermarket part you are installing? Is there a danger in this, or just more of a hassle than buying an adapter? Thanks.

 

[figgie]

IJ - why not just redrill/retap the hole with a pipe thread that matches whatever aftermarket part you are installing? Is there a danger in this, or just more of a hassle than buying an adapter? Thanks.

because you would need to drill out the metal completely and then use a "heli-coil". I am almost positive that heli-coil does not make pipe thread repair kits.

 

[bgim]

because you would need to drill out the metal completely and then use a "heli-coil". I am almost positive that heli-coil does not make pipe thread repair kits.

So sorry, that went over my head. Why do you need heli-coil rather than re-tapping the hole? Are all the aftermarket sender units designed for a smaller diameter, or is there a technical problem with tapping threads into the block?

 

[adampecush]

most senders are roughly the same size as the current hole. You can't just re-tap, as you will be cross-cutting the threads that are currently in there (no chance in hell of sealing these threads). What you would need to do is get a thread adapter that has a minor thread diameter bigger than the max thread diameter of the female threads, and drill/tap a new hole based upon the new threads.

 

[jdub]

1/8" BSPT = 0.328" tap drill (minor diameter)...major diameter = 0.383"
1/8" NPT = 0.332" tap drill (minor diameter)

The NPT tap drill will not remove all the BSPT threads....the tap drill needs to be > 0.383"

To do this as suggested, you will have to go to the next size NPT:
1/4" NPT = 7/16" (0.438") tap drill

 

[Justin]

does anyone have a picture of this port behind the power steering pump? i'm installing mine soon also and i cant see the port you guys are talkin about. i have a relocation hose tho so i can always just use that, but i would like to know where this other port is just in case

 

[jdub]

And that port (circled) is also 1/8" BSPT
It's just plugged from the factory.

 

[IJ.]

"Recoil" do an 1/8 bsp kit the inserts are STK1/8BSP but these aren't tapered and are a last resort type of fix and you need to use a good sealer on insertion.

 

[TheNewRed]

To do this as suggested, you will have to go to the next size NPT:
1/4" NPT = 7/16" (0.438") tap drill

Would doing this, in my situation, be ok? would it be just a typical drill and tap?

 

[Slow66]

Im wondering why theres such a long thread on this... (and it hurt my head to read most of it, so i didnt)

http://store.summitracing.com/partdetail.asp?autofilter=1&part=ATM-2269&N=700+115&autoview=sku

^ that works fine..... :dunno:

 

[viper92086]

awesome thanks!!

 

[jdub]

Red - Should be fine. Make sure you clean out the metal shavings really well...don't want them getting to your bearings. Use tapping fluid or oil to lube the NPT tap...take your time, the block is fairly hard.

It would be a lot easier to use the adapter Slow posted above though

Im wondering why theres such a long thread on this... (and it hurt my head to read most of it, so i didnt)

LOL...yeah, this thread went off on a couple different tangents!