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Thread: Problem with damaged port - stripped out threads

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    RBW Member DarthCoker is on a distinguished road DarthCoker is on a distinguished road DarthCoker's Avatar
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    Problem with damaged port - stripped out threads

    Greetings

    Have a problem with my KISS classic - the port where a HUD should enter the casing (Kidney) has stripped out threads.
    This happened when I removed the HUD - apparently the HUD 90 degree elbow was screwed in at an angle by the previous owner and got cross-threaded. Result, when I took the HUD out, it pulled the threads out with it.

    Solution - need to retap the port hole and install a plug.

    Problem - I am having a hard time finding which size tap will fit which size plug. Lot of the hardware store people dont seem to know this. Probably because they are use to newly tapped holes having a screw used, instead of a Pipe Thread plug.

    Anyone have a suggestion as to finding which fits which?

    STEVE COKER
    darthcoker@yahoo.com

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    Re: Problem with damaged port - stripped out threads

    The original hole was 1/8" pipe thread. This is almost the same as 3/8"-16 straight thread (LP port on scuba regulator 1st stage). I would drill and tap the hole 7/16-14 and use a HP plug from a 1st stage. You will need to counter sink the top of the hole a little for the o-ring to seal.

    Take a 7/16" plug with you to the store when buying the tap to double check the thread count.

    Ted
    Last edited by O.C.Diver; 19th January 2009 at 19:08. Reason: spelling

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    Re: Problem with damaged port - stripped out threads

    I may have made a mistake in the previous post. Are you referring to the kidney (sensor cover) or the head (where the CL attach). My post was for the port in the head (opposite side from the ADV diaphragm.

    Ted

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    Re: Problem with damaged port - stripped out threads

    Quote Originally Posted by O.C.Diver  View Original Post
    The original hole was 1/8" pipe thread. This is almost the same as 3/8"-16 straight thread (LP port on scuba regulator 1st stage). I would drill and tap the hole 7/16-14 and use a HP plug from a 1st stage. You will need to counter sink the top of the hole a little for the o-ring to seal.

    Take a 7/16" plug with you to the store when buying the tap to double check the thread count.

    Ted
    Ted,
    a scuba regulator port is 3/8 24 not 3/8 - 16
    Joe Radomski
    CCR Trimix Instructor Trainer
    ANDI Instructor Trainer Director #10

    All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

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    Re: Problem with damaged port - stripped out threads

    The port is the one opposite the ADV on the head.

    Will look into the use of scuba plugs.

    S COKER

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    Re: Problem with damaged port - stripped out threads

    You could drill and tap it the next size up with NPT thread, then just use a NPT plug to cap it. You would not have to worry about oring seals or anything of the sort. You could also find another elbow in the larger size incase you want to reuse that port for gas or another HUD.

    Its fun drilling and tapping expensive stuff! Let us know how you get on.

    Cam

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    Re: Problem with damaged port - stripped out threads

    Got the repair made. Took a bit of time to find all the items to make the repair, they are available on the internet if you cant find them locally.

    Used the following to repair the damage port.

    Tap - 1/4" NPT - borrowed from an engineer friend who had set of NPT taps
    Drill - 7/16" titanium bit - bought from local hardware store
    plug - 1/4" NPT - stainless from Sweglok

    This plug size was the next size up from the damaged port that was readily available.
    It was a fairly easy repair (took about 10 minutes) and the plug fit into the newly thread port easily and snuggly. Used a bit of Silicone sealant on the plug threads to make sure there would be no trickling leakage.

    S Coker

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    Re: Problem with damaged port - stripped out threads

    Quote Originally Posted by DarthCoker  View Original Post
    Got the repair made. Took a bit of time to find all the items to make the repair, they are available on the internet if you cant find them locally.

    Used the following to repair the damage port.

    Tap - 1/4" NPT - borrowed from an engineer friend who had set of NPT taps
    Drill - 7/16" titanium bit - bought from local hardware store
    plug - 1/4" NPT - stainless from Sweglok

    This plug size was the next size up from the damaged port that was readily available.
    It was a fairly easy repair (took about 10 minutes) and the plug fit into the newly thread port easily and snuggly. Used a bit of Silicone sealant on the plug threads to make sure there would be no trickling leakage.

    S Coker

    Keep a sharp eye on it now and forever onwards. Pipe threads are tapered and as such, exert lateral force which tries to tear the hole apart. Mostly that means they cause the material to crack leading away from the hole. That's why you so seldom see pipe threads used on anything scuba related.

    Using a straight 7/16 fine thread and a high pressure port plug would have been a more reliable fix.

    If it starts to leak, don't tighten it, you'll only crack it more. Go back and do a different type repair.

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