34mm rad hose adaptor npt fitting Q - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Bigsyke · 06-08-2009, 05:19 PM

I got 2 of those rad hose adaptors for my breather tank setup. However the 1/8th npt fittings arent threading in all the way - maybe 1/2 if even. Its a very very tight fit, as if im crossthreading, however ive tried about 4 different fitting styles and all are the same.

Isnt the NPT fittings supposed to be a looser fit, because you have to use teflon tape? I couldnt even use thread locker because the fit is so tight. I even snapped a fitting half way in, which required me to order another 34mm rad hose adaptor.

orion::S14 · 06-08-2009, 06:58 PM

No...NPT is a tight fight, it's tapered.

It get's tighter as you turn it...so there's no need for teflon tape or anything.

- Brian

Bigsyke · 06-08-2009, 07:16 PM

Sweet, is there a general torque setting for it? I think I snapped the other fitting at about 15lbs.

DreamN · 06-08-2009, 08:05 PM

Hand tight should be more than enough.

j87w · 06-08-2009, 10:20 PM

Quote:

Originally Posted by orion::S14

No...NPT is a tight fight, it's tapered.

It get's tighter as you turn it...so there's no need for teflon tape or anything.

- Brian

What do you use teflon tape on? Teflon tape (PTFE) is designed for pipe thread (NPT) . You can get away without using teflon tape on pipe but I have had much better luck when using teflon to eliminate leaks. Thread seal tape - Wikipedia, the free encyclopedia

Also when tapping NPT threads the general rule I have always gone by is to run the tap in 2/3 way. So you should never run up the fitting until its out of threads.

japslapsilvia · 06-09-2009, 08:38 AM

what hose adapter are u using? greddy sard? and are u using a provided fitting or did u just get a NPT fitting?

if you are using a Jap brand (greddy sard etc) then the hole is not NPT it BSPT or PT, they are a little different from NPT.

Bigsyke · 06-09-2009, 02:40 PM

I got one off ebay for $15

34mm Water temp Gauge Radiator Hose Sensor Adaptor:eBay Motors (item 290305177970 end time Jun-21-09 21:41:50 PDT)

06-08-2009, 05:19 PM	#1
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	34mm rad hose adaptor npt fitting Q I got 2 of those rad hose adaptors for my breather tank setup. However the 1/8th npt fittings arent threading in all the way - maybe 1/2 if even. Its a very very tight fit, as if im crossthreading, however ive tried about 4 different fitting styles and all are the same. Isnt the NPT fittings supposed to be a looser fit, because you have to use teflon tape? I couldnt even use thread locker because the fit is so tight. I even snapped a fitting half way in, which required me to order another 34mm rad hose adaptor.

06-08-2009, 06:58 PM	#2
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	No...NPT is a tight fight, it's tapered. It get's tighter as you turn it...so there's no need for teflon tape or anything. - Brian __________________ www.KA24DEvelopment.com

06-08-2009, 08:05 PM	#4
DreamN Post Whore! Join Date: Nov 2006 Location: SoCal - 818 Age: 40 Posts: 10,692 Trader Rating: (54) Rides Gallery: DreamN Feedback Score: 54 reviews	Hand tight should be more than enough. __________________ - Jimmy Wanted: TBD For Sale: TBD

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06-08-2009, 07:16 PM	#3
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	Sweet, is there a general torque setting for it? I think I snapped the other fitting at about 15lbs.

06-09-2009, 02:40 PM	#7
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	I got one off ebay for $15 34mm Water temp Gauge Radiator Hose Sensor Adaptor:eBay Motors (item 290305177970 end time Jun-21-09 21:41:50 PDT)