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Old 07-30-2014, 09:46 AM
6gun 6gun is offline
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Exhaust Riser plug thread tap

Anyone know where I can get a "reasonably priced" thread tap to clean up the threads on the drain plugs in my exhaust risers? Tried wire brush, did some good, but they still leak a little. Don't want to force the drain plugs in and crack the risers....

Plug is 1" ... so a real tap would run around $90 for a 5 minute job....
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Old 07-30-2014, 10:32 AM
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CantRepeat CantRepeat is online now
 
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http://www.hardwareworld.com/Pipe-Ta...T-p10K8BI.aspx
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Old 07-30-2014, 12:01 PM
jmhjgh jmhjgh is offline
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Are you using teflon tape? Cleaning with a wire brush and teflon tape should be more than sufficient for sealing.
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Old 07-30-2014, 05:08 PM
6gun 6gun is offline
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WOW! C.R. awesome find! Thanks!

JM - Yes....I either use T-Tape or Locktite Copper or Nickel Anti-Seize, which I use all around the boat and trailer...lug nuts, drain plugs, steel bolts on aluminum tower, rudder rigging, etc.

HOWEVER....

I had the boat winterized last winter by someone else and the tech left the manifold drains out after draining in a plastic bag and the untreated threads got pretty filled up with rust.

Last edited by 6gun; 07-30-2014 at 05:18 PM.
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Old 07-30-2014, 05:44 PM
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I don't know what size tap you need for your boat, but my boat's plugs are 3/4" NPT. The hole is about an inch, but pipe sizes are the inside diameter of the pipe that would thread in that hole.
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Old 07-31-2014, 01:02 PM
6gun 6gun is offline
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No worries Table Rocker, I plan to "measure twice, cut once" and will put a caliper on it before I buy the tap. BTW, where do you go on Table Rock? We have a place west of Shell Knob on the lake between the 22 and 23 mile marker on the main channel.
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Old 08-01-2014, 10:37 AM
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Quote:
Originally Posted by 6gun View Post
No worries Table Rocker, I plan to "measure twice, cut once" and will put a caliper on it before I buy the tap. BTW, where do you go on Table Rock? We have a place west of Shell Knob on the lake between the 22 and 23 mile marker on the main channel.
We are directly across the channel from the slalom course at Little Cow Creek. We are on Coney Island which is just east of the Kimberling City bridge.
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Old 08-04-2014, 06:38 PM
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Worthing skier Worthing skier is offline
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Tap size

Hi there

3/4 x 14 npt taper tap $8 on Ebay

Kevin
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  #9  
Old 08-26-2014, 08:58 PM
88 PS190 88 PS190 is online now
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Another quicky if you have a steel plug around or a hardware store is to use a dremel with a grinding disc to cut a slot through the threads in line with the plug.

That slot acts like the slots in taps, but will act to clean them up.
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Old 08-27-2014, 12:31 PM
bochnak bochnak is offline
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NPT info:

http://www.engineeringtoolbox.com/np...ads-d_750.html

Maybe brush on some evaporust and skip tapping?

Mine are pretty rusty too, and don't have a lot of thread engagement.
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