Like Tree0Likes

NPT question

Reply
Old 07-19-2009, 01:45 PM
  #1
Registered
Thread Starter
 
Join Date: Jun 2004
Posts: 18
Default NPT question

I have a oil leak down at my oil filter adapter that routes the oil from the bottom of my BBC (Dart) up to my remote housing. I isolated the leak to what I think is 1/2" npt coming out of the adapter to -10 an going up to the remote housing. When I pulled the fitting out it apeared not to be standard tapered pipe thread it was straight thread and shorter with a oring. I bought a fitting with 1/2" npt which threaded in nicely but was very sloppy on thread lash and would definately not hold oil pressure. My question is what is the proper fitting to go in, is it surpposed to be a oring seal or is it tapered npt? All the ones I find online like at CP performance mention 1/2" or 3/4" npt? I don't know what to think. I would just take the whole assembily to the parts store if I could be as you know it is in a very akward posistion and removeal is next to impossible without tearing half the motor apart. The motors are 532ci Dart blocks 871s 850hp
Tim Bullen is offline  
Reply With Quote
Old 07-19-2009, 11:02 PM
  #2
Platinum Member
Platinum Member
 
Tinkerer's Avatar
 
Join Date: Jan 2002
Location: ALTO, MI
My Boats: 2001 Daytona 26, 1992 SCARAB 34, 1989 25 Checkmate Convincer, 1977 Glastron Carlson CVX 18
Posts: 4,144
Default

When you said that the 1/2 NPT fitting threaded in but was sloppy - was the fitting bottomed out ? ( no threads showing )
If it was then it isn't a NPT thread.
What does the O ring look like? Any cuts of abrasions?
I would say put a new O ring on it and some locking thread sealer up by the O ring only and tighten it back up.
Tinkerer is offline  
Reply With Quote
Old 07-20-2009, 01:17 AM
  #3
Registered
Thread Starter
 
Join Date: Jun 2004
Posts: 18
Default

I didn't bottom it out, it just didn't seem to be snugging up as I threaded it in. I will get back in and try it again. I am begining to think it isn't NPT.
Tim Bullen is offline  
Reply With Quote
Old 07-20-2009, 11:01 AM
  #4
Gold Member
Gold Member
 
Join Date: Mar 2004
Location: DETROIT MI
My Boats: NONE
Posts: 114
Default port thread

if the fitting has a o-ring on it . that is a straight thread size #10
that is a 7/8-14 thread. if you screwed in a 1/2-14 npt pipe it will fall out. look at the port that you are threading in to if it is a straight thread port you will see a chanfer for the o-ring to seat in to. if you have a small drip you may have a bad o-ring.
Jb-fse is offline  
Reply With Quote
Old 07-20-2009, 11:10 AM
  #5
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
My Boats: 330 Carver 30' Scarab Panther 17' ProV Lund
Posts: 3,359
Default

If you could lower a digital camera down and snap a pic of the port we would be more helpful.
blue thunder is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 02:05 AM.


Copyright 2011 OffShoreOnly. All rights reserved.