Thread sizes???? Ed. C or Sensei or anybody??
Submitted: Sunday, Apr 04, 2004 at 19:31
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Roachie
G'day all,
Back in POST # 11,482 I asked about fitting an oil pressure gauge to my 4.2 Patrol. Ed.C & Sensei both kindly gave me a lot of advice....thanks again for that.
I have now got a VDO 100psi gauge and sender unit; ordered through a local auto sparky. I asked them to get me an adapter too (1/8bsp male & 1/8ntp female). It got stuffed up somewhere along the way and they sent a 1/4bsp male+1/8ntp female. Anyway, I've fitted and wired as much as I could and have also slightly moved a pipe which was in the way of where I want to fit the sender.
As part of my preparations I decided to bench
test the whole lot. I have a first generation ARB compressor which has numerous outlets. I removed one of the 1/8" plugs on the compressor, believing it to be a bsp arrangement. I tried to fit the sender unit and hey presto....it fitted. I then went on to
test it and all went okay.
My question is therefore.....does anybody know what the ARB compressor's 1/8" thread type is? (bsp or npt). I have a few different brass fittings that fit the compressor as
well as the new sender unit fits. I always believed these brass fittings to be BSP.
On friday afternoon after I picked up the unit from the auto sparky, I did a run around of every possible place that might stock a brass adaptor. A couple of them said the only difference between the 2 thread types is that one has 27tpi, the other 28tpi (threads per inch). One bloke at a large tractor place said he is aware there is a slight difference but he just uses a spanner to force a fitting in and never has any worries. Sounds a bit rough to me.
I also priced a bottle of Loctite hydraulic thread sealant and nearly fell over when I was quoted $30- for about 100ml. I only need a couple of drops!!!
Anyway, if anybody has anything worth letting me know about, I'd appreciate it. I will be getting on to the auto sparky tomorrow to let them know that I had no luck getting the conversion adaptor and seeing if they can get it for me. It just seems strange how
well the unit fitted in to the ARB compressor (bsp thread????)
Cheers,
Roachie
Reply By: sensei - Monday, Apr 05, 2004 at 00:05
Monday, Apr 05, 2004 at 00:05
Hi Roachie,
Im unsure as too what type of thread is on your ARb compressor but there is a way you can
check the threads. Yep there is a 1 tpi difference between BSP and NPT and yes alot of people do just screw them in, me included. I have done that in the past on different things and had no problems but only when I've had no choice about it. To
check the threads just hold the sender in one hand, the plug in the other hand and place the plug on the top of the thread of the sender.
Check to see in any light comes throught the two threads, if there is none or very little ( a bit hard to discribe this) then the two threads must be the same..BSP.
If that is not enough try to get hold of some thread gauges and
check the threads on the sender/plug with them.
If you beleive they are the same thread then try the sender into
the block of the engine by hand, if it feels OK then great.
Just one more thing, if memory serves me correctly the the VDO electric sender units are all BSP and you may have nothing to worry about, but of course please
check the thread size first.
Hope this helps Roachie.
AnswerID:
53200
Follow Up By: Roachie - Monday, Apr 05, 2004 at 09:29
Monday, Apr 05, 2004 at 09:29
Sensei,
Thanks for the suggestion mate. I may try that later. If the plug was a bit easier to get at, I reckon I'd just rip it out and try the sender unit in the hole. But if it doesn't fit properly, I'll have to put it all back together again and keep looking for a adaptor.
Cheers,
Roachie
FollowupID:
314952