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  #1  
Old 07-30-2014, 08:46 AM
6gun 6gun is offline
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Join Date: Jul 2010
Boat: 1990 Maristar 240 SC, 454/425hp
Location: Bloomfield Hills, MI
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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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  #2  
Old 07-30-2014, 09:32 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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  #3  
Old 07-30-2014, 11:01 AM
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, 04:08 PM
6gun 6gun is offline
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Boat: 1990 Maristar 240 SC, 454/425hp
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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 04:18 PM.
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  #5  
Old 07-30-2014, 04:44 PM
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Table Rocker Table Rocker is offline
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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 Yesterday, 12:02 PM
6gun 6gun is offline
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Boat: 1990 Maristar 240 SC, 454/425hp
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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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