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  1. #1
    Member
    Join Date
    Mar 2006
    Posts
    27
    Location
    Kenwood California
    Tractor
    Kubota L2550GST

    Default Block plug leak

    This morning my '93 kubota L2550 developed a small water leak at what looks like a freeze protection plug in the block between the exhaust manifold and alternator. The repair manual doesn't mention the plugs (there are three on that side of the block) and they don't show up in any diagram I can find. Has anyone had experience replacing one of these? How difficult is it?

    Thanks in advance.
    Ian

  2. #2
    Silver Member
    Join Date
    Jun 2008
    Posts
    179
    Location
    SW Iowa
    Tractor
    BX24

    Default Re: Block plug leak

    Unless you actually want to try to press in an identical metal plug I think any good auto parts store will have a replacement plug.

    Freeze Plug | AutoZone.com

    Getting the old one out may be harder than wrenching in the replacement.

    Take Care,
    Doug in SW IA

  3. #3
    Elite Member
    Join Date
    Sep 2004
    Posts
    2,513
    Location
    Kansas, Butler county, Just east of DooDah
    Tractor
    Kubota L4200 GSTCA

    Default Re: Block plug leak

    Just curious... Do you regularly change your coolant every couple of years?

  4. #4
    Super Member texasjohn's Avatar
    Join Date
    Oct 2005
    Posts
    6,048
    Location
    Central Texas, Jarrell
    Tractor
    Kubota Grand L5030HSTC

    Default Re: Block plug leak

    never had the problem...maybe radiator stop leak? or water weld?
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

  5. #5
    Platinum Member Buckgnarly's Avatar
    Join Date
    May 2012
    Posts
    529
    Location
    West topsham VT
    Tractor
    Kioti DS3510

    Default Re: Block plug leak

    Knock it out by hitting a corner to flip the plug, then use pliers to pull it out. Be careful though, they can be close to cylinder walls, just do not go whaling on it with the punch and hammer.
    They go make install tools that make install easy on hard to reach ones, but if you have a straight shot you can use a socket and extension.
    Look at my block heater install post for pics that may help explain it.

  6. #6
    Member
    Join Date
    Mar 2006
    Posts
    27
    Location
    Kenwood California
    Tractor
    Kubota L2550GST

    Default Re: Block plug leak

    The tractor has only 1200 hours on it and the coolant's been changed once or twice.

  7. #7
    Member
    Join Date
    Mar 2006
    Posts
    27
    Location
    Kenwood California
    Tractor
    Kubota L2550GST

    Default Re: Block plug leak

    Thanks for the help. We have rain here today (finally) and am going to get right on it. As the leak is very small I may try an additive first.

  8. #8
    Elite Member
    Join Date
    Sep 2004
    Posts
    2,513
    Location
    Kansas, Butler county, Just east of DooDah
    Tractor
    Kubota L4200 GSTCA

    Default Re: Block plug leak

    Coolant changed once or twice over 20 years is the problem... The anti rust additives breakdown wit Time, Not operation hours.
    It is very likely that the other core plugs are about rusted through, from the inside... You should change ALL of them and inspect all steel components in the system.
    Typical coolant should be changed 7 to 10 times in a 20 year period, Long Life coolants 4 change out & flushes.... This should serve as a reminder to others... Just because antifreeze will not freeze, is No indication that it is still good.
    Last edited by KennyV; 03-20-2013 at 05:07 PM.

  9. #9
    Silver Member
    Join Date
    Mar 2007
    Posts
    188
    Tractor
    B3030HSDCC, Oliver 77, JD LX288

    Default Re: Block plug leak

    Quote Originally Posted by KennyV View Post
    Coolant changed once or twice over 20 years is the problem... The anti rust additives breakdown wit Time, Not operation hours.
    It is very likely that the other core plugs are about rusted through, from the inside... You should change ALL of them and inspect all steel components in the system.
    Typical coolant should be changed 7 to 10 times in a 20 year period, Long Life coolants 4 change out & flushes.... This should serve as a reminder to others... Just because antifreeze will not freeze, is No indication that it is still good.
    I agree & want to add STAY AWAY FROM THOSE COOLING SYSTEM SEALERS! They may plug up the leaks fine, but the problem is that they also plug up everything else.

  10. #10
    Gold Member
    Join Date
    Mar 2007
    Posts
    363
    Location
    Dimock, Pa.
    Tractor
    Kubota L4240 Kubota B7800, Kubota BX2200

    Default Re: Block plug leak

    Ian,
    I'd check with a kubota dealer if possible before trying to remove the plug. On newer models the plug needs to be removed with something like a slide hammer, i.e, drill a small hole in the center of the plug, screw in slide hammer attachment and knock it out. The block opening behind the plug may not be a through hole as there may be only a narrow slot behind the plug into the water chamber. Because of this you may not be able to turn the plug. Also, because of the small slot it's important to drill the small hole as close to the center of the plug as possible.

    Quote Originally Posted by IanM View Post
    This morning my '93 Kubota L2550 developed a small water leak at what looks like a freeze protection plug in the block between the exhaust manifold and alternator. The repair manual doesn't mention the plugs (there are three on that side of the block) and they don't show up in any diagram I can find. Has anyone had experience replacing one of these? How difficult is it?

    Thanks in advance.
    Ian

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