Mag-Hytec diff cover & Autometer sending unit
Logistics Pro
Joined: Aug 2005
Posts: 3,884
Likes: 180
From: Morgan Hill, CA
Cool. Good luck. The tap might feel a bit tight since the minor diameter (inside of the threads) is 4 thou smaller than a Q drill, but a human hair is like 3 thou so it's really not that much. I routed the wire up and used black silicone to adhere it to the housing in a couple of spots then zip tied it to the brake line or ABS sensor wire, I can't remember off the top of my head.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
ReAX,
I might be wrong about this, but I thought NPT stood for National Pipe Tapered as opposed to NPS(National Pipe Straight). You are correct in that NPT does in fact taper which helps make a good seal as the threads get tighter the deeper you get. It's kind of like taps. There are starter taps, plug taps and bottoming taps and each has a different taper to it.
I might be wrong about this, but I thought NPT stood for National Pipe Tapered as opposed to NPS(National Pipe Straight). You are correct in that NPT does in fact taper which helps make a good seal as the threads get tighter the deeper you get. It's kind of like taps. There are starter taps, plug taps and bottoming taps and each has a different taper to it.
It's quite possible, I have never heard of or seen NPS. My grandfathers called it nation pipe thread, so that's where I get it.
Thread Starter
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Fleet Mechanic
Joined: Feb 2004
Posts: 1,902
Likes: 9
From: Northern IL
So I now have the right tap 1/8" 27NPT Taper tap and I also have the bit 21/64.
I will drill and tap the cover this week and let you know how it came out.
The Taper Tap is the right one right?
Thanks again ~Gage~
I will drill and tap the cover this week and let you know how it came out.
The Taper Tap is the right one right?
Thanks again ~Gage~
Posting Guru
Joined: Nov 2006
Posts: 1,154
Likes: 2
Take a look at the right side of this chart:
American Standard Pipe Dimensions -- Technical Notes
If you look at the bottom, it shows that for NPT with reamer you use a reamer with a taper of 3/4" per foot. To get an idea of what that is, take two rulers and touch the ends together and spread the other ends 3/4" apart. It might not look like much taper over the short length of a small tap, but you will get the idea.
American Standard Pipe Dimensions -- Technical Notes
If you look at the bottom, it shows that for NPT with reamer you use a reamer with a taper of 3/4" per foot. To get an idea of what that is, take two rulers and touch the ends together and spread the other ends 3/4" apart. It might not look like much taper over the short length of a small tap, but you will get the idea.
Thread Starter
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Fleet Mechanic
Joined: Feb 2004
Posts: 1,902
Likes: 9
From: Northern IL
OK I see what you meen, also what would be best to use sealant compound or Teflon tape I have both. Thanks again for your time and help ~Gage~
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Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I'd steer clear of tef-tape since you need good contact and I suspect that tef-tape is non-conductive. At least we used it on steel scuba tanks and brass valves to stop corrosion, I think was partially the pressure but we were also concerned about electrolysis.
PTE pipe dopes are probably the same, so read your labels.
PTE pipe dopes are probably the same, so read your labels.
Thread Starter
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Fleet Mechanic
Joined: Feb 2004
Posts: 1,902
Likes: 9
From: Northern IL
I just installed the rear cover today and it went well took about 1.5hrs to install and fill.
Thanks for all you help guys.
Also does anyone have the front cover on their trucks? I have the Mag-Hytec front cover and hope to install it tomorrow.
~Gage~
Thanks for all you help guys.
Also does anyone have the front cover on their trucks? I have the Mag-Hytec front cover and hope to install it tomorrow.
~Gage~
Posting Guru
Joined: Nov 2006
Posts: 1,154
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Yes, I have M-H covers on both diffs and a M-H tranny pan. I have temp probes in all three along with another one in the block for coolant temp. I wired them through a selector switch so I can read any of them on the tranny temp gage. All three covers and the block plug adapter are threaded 1/8" NPT, as are the temp probes. I did not have to drill or tap anything.