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Thread: What size plug is used on Rear wheel CTIS removal?

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    4 Star General MtnSnow's Avatar
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    Default What size plug is used on Rear wheel CTIS removal?

    After changing out a few tires/wheels on the Beast I'm really contemplating removing the CTIS and or have the plugs on hand if something breaks while out on the road.....So I want to know what size thread/Plug(s) are being used to plug the rear hubs when doing a CTIS removal. So far I have not been able to find an answer to this question. I have found mentioning of using a 3/4x16 drain plug for the front hub but only seen a picture of a plug but no sizes listed for the rear....Also where to find them if oddball sized.

    Thanks in advance for helpful insight.
    - MtnSnow -
    aka Mike
    1990 BMY M923-A2 8.3L (The Beast)
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    1990 BMY M925-A2 8.3L (The Beast II)
    2007 Fermont MEP-803A 10Kw Gen on 2007 M116A3 trailer
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    Colonel 5tonman1971's Avatar
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    If you have a working ctis system I would leave it alone. After owning my m813a1 with no ctis I have grown to really appreciate my ctis on my m939 series. You always have correct tire pressure it lets you know if your loosing pressure and as long as you don't get a complete blow out the ctis will keep that tire air up enough to get you some where safe.

    Even to be able to drop the tire pressure in 2 inches of wet slippery packing snow like lower Michigan kind of snow that turns to ice when it gets packed down making a tire aired up over 50 psi USELESS and cuasing you to be stuck in your own yard.

    In my opinion the ctis is of of the highlights of these trucks!(when it's working that is)
    1971 m813a1 W/W Michelin 16.00 XZL's HEMTTs-sold
    1990 m925a2 W/W on Michelin 14.00 XZL's
    1992 m923a2 Wo/W on Michelin 14.00 XZL's-sold
    1984 m105a2

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    Don't get me wrong 5tonman I like my working CTIS but while doing the work I did can see the benifit of having the capability of capping off the CTIS parts when out on the trail without replacement parts available. (Much easier to keep a couple of plugs in a toolbox than a complete CTIS housing/hoses etc)
    - MtnSnow -
    aka Mike
    1990 BMY M923-A2 8.3L (The Beast)
    1987 TACOM M105-A2 Trailer
    1990 BMY M925-A2 8.3L (The Beast II)
    2007 Fermont MEP-803A 10Kw Gen on 2007 M116A3 trailer
    1995 Libby Corp. MEP-804A 15Kw Gen on a 1983 M200A1 trailer

    MVPA Member #36120
    2015 Lincoln MKX

    Staring at it like a moron is the first step in any quality repair job. - welldigger

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    Update...It looks like it is an "-10AN straight thread plug" is what is needed. Which is a 5/8 x 14 thread from what I have finally come across. Going to hit one of the local hydraulic hose shops and see if I can get a couple and actually physically check that is what is needed.
    - MtnSnow -
    aka Mike
    1990 BMY M923-A2 8.3L (The Beast)
    1987 TACOM M105-A2 Trailer
    1990 BMY M925-A2 8.3L (The Beast II)
    2007 Fermont MEP-803A 10Kw Gen on 2007 M116A3 trailer
    1995 Libby Corp. MEP-804A 15Kw Gen on a 1983 M200A1 trailer

    MVPA Member #36120
    2015 Lincoln MKX

    Staring at it like a moron is the first step in any quality repair job. - welldigger

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    Did that work?

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    4 Star General MtnSnow's Avatar
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    Yes.
    - MtnSnow -
    aka Mike
    1990 BMY M923-A2 8.3L (The Beast)
    1987 TACOM M105-A2 Trailer
    1990 BMY M925-A2 8.3L (The Beast II)
    2007 Fermont MEP-803A 10Kw Gen on 2007 M116A3 trailer
    1995 Libby Corp. MEP-804A 15Kw Gen on a 1983 M200A1 trailer

    MVPA Member #36120
    2015 Lincoln MKX

    Staring at it like a moron is the first step in any quality repair job. - welldigger

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    Can u snap a pic of where u cap?

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    Just to update this post with a little clearer info. The tube size is 5/8. The thread is a -10AN which is a 7/8x14 thread. Parker makes caps with orings for a couple dollars each. Search "Parker 10 P5ON-S SAE Hex Head Pipe Plug 7/8-14 ORB Male Steel" if you want to find them reasonably.

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    what are you going to use to cap the front tires? Those Military Guys have this:
    https://thosemilitaryguys.com/collec...tis-delete-kit

    I just don't know what they are doing for the front tires
    M923A2, year 1991, ROPS and Turret.

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    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by Lizard333 View Post
    what are you going to use to cap the front tires? Those Military Guys have this:
    https://thosemilitaryguys.com/collec...tis-delete-kit

    I just don't know what they are doing for the front tires
    Some folks leave them on or simply fill the hole with RTV. Or if you can find the right size expansion rubber to fit in it and then use the bolt in the threads to expand and secure it
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