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Old     (loudsubz)      Join Date: Aug 2001       06-07-2010, 6:30 PM Reply   
I have a drain plug on my exhaust manifold and it uses a standard 1/4" NPT thread on it and small 1/4" bolt that you can buy in any hardware store.

Problem is the hole is all corroded from rust over the years and I need to clean it out.

For the life of me I can't figure out what size tap to use to clean it out. I have tried 7/16 but its a little too small, and the 1/2" taps I have used are 13 and 20 and the 20 seems to work the best but it wont thread on all the way through on a test pipe I have, it only goes about 3/4" in.

Anyone know the correct thread pitch for this?
Old     (joesell)      Join Date: Apr 2001       06-07-2010, 7:17 PM Reply   
It's a pipe tap. The threads are tapered.
Old     (loudsubz)      Join Date: Aug 2001       06-07-2010, 8:24 PM Reply   
Where would I get that type of tap?
Old     (cwb4me)      Join Date: Apr 2010       06-07-2010, 8:30 PM Reply   
snapon .com or a snap-on dealer would have one also maybe home depot or lowes in plumbing.
Old     (chpthril)      Join Date: Oct 2007       06-07-2010, 10:05 PM Reply   
You need a 1/4 NPT tap. Do you have a NAPA auto parts store around ya! They should be able to get you one.
Old     (dave27)      Join Date: May 2005       06-08-2010, 8:37 AM Reply   
orchard supply will have them too.
Old     (trace)      Join Date: Feb 2002       06-08-2010, 8:50 AM Reply   
Also Sears or www.mcmaster.com
Old     (masonwakerider)      Join Date: May 2003       06-08-2010, 9:05 AM Reply   
got one at ace hardware last week
Old     (loudsubz)      Join Date: Aug 2001       06-08-2010, 11:56 AM Reply   
gonna check around thanks
Old     (lifetimewarranty)      Join Date: Oct 2008       06-08-2010, 11:57 AM Reply   
1/4" NPT tap needs a 7/16 drill

sounds like you need just the tap...

Last edited by lifetimewarranty; 06-08-2010 at 11:59 AM.

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