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  1. #1
    Silver Member
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    Jun 2008
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    west virginia
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    1994 Kubota B7100 HST 4WD

    Default B7100 oil leak - sealing of oil pressure sending unit threads?

    I have an oil leak that appears to be by the oil light sending unit.

    The parts manual does not show any kind of oring or seal there....how is that sensor sealed?

    *** Reading/searching the forum - one person mentioned that this engine has an oring that fails in the headgasket right around that area too, anyone comment on that...?
    1994 Kubota B7100 HST 4WD
    60" Kubota MMM, 48" Landpride Bush hog, snow blade, 6 blade disc, plow

  2. #2
    Silver Member
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    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    You will find that the sending unit to block is a tapered pipe thread... most likely 1/8" NPT It is not unusual for these sending units to go bad and start leaking. Clean the area and keep an eye on it to be sure.

  3. #3
    Veteran Member Code54's Avatar
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    Aug 2005
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    1,576
    Location
    Putnam Co. West Virginia
    Tractor
    Kubota MX5100 (50 Hp, 42.5 pto) Kubota BX25D Gravely 2 wheel tractor

    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    How do you know if the unit is bad? Is there a way to test them?
    Kubota MX5100
    Kubota BX25D
    Gravely 2 wheel tractor
    Camo RZR4 800LE

  4. #4
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    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    In this case it is bad if it starts leaking oil. Electrically, it is bad if it doesn't have continuity with no pressure, or doesn't open when the oil pressure comes up. It is basically a switch, turning on the warning lamp on the dash.
    These units are cheap and available at most any auto parts stores.

  5. #5
    Bronze Member j t huskins's Avatar
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    Sep 2011
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    Boone N.C.
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    Ford 1210 4x4 With Ford Front 3 Way Snow Blade ,Newholland TC40A 4x4 With NH 16LA FEL,Kubota B7100 4x4 With Kubota FEL Project Tractor, Ford 1210 4x4 Parts Tractor.

    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    You will find that the sender is a taperd british pipe thread and you will not find one at a basic parts store. This is a good time to install a gauge to monitor your op. The O ring mentioned is just above the sending unit in the head gasket and seals the oil pressure port from the block to the head. Clean the area real good then keep a watch to locate the source. Just remember that the low pressure light does not iluminate until the oil pressure is low . If you fail to see the light in time then the results can be very expensive.
    NHTC40A 16LA FEL
    Ford 1210 4x4 Front Blade
    Kubota B7100 Kubota FEL
    Ford 1210 4x4 Parts Tractor
    CubCadet 1554

  6. #6
    Silver Member
    Join Date
    Jun 2008
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    Location
    west virginia
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    1994 Kubota B7100 HST 4WD

    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    I reinstalled the same sensor with teflon tape on the threads and cleaned the engine up thoroughly. No signs of leakage yet but only an hour or two run time.

    The sensor had very old remnants of thread tape from eons ago squished up under the sensor when I removed it. can't decide if that's:

    1. a good sign that the stuff was ancient and needed replaced
    or
    2. a bad sign that someone tried to fix the leak before and didn't get it!
    1994 Kubota B7100 HST 4WD
    60" Kubota MMM, 48" Landpride Bush hog, snow blade, 6 blade disc, plow

  7. #7
    New Member
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    Jun 2012
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    Location
    Camas, WA
    Tractor
    Kubota B8200HST, Craftsman LT2000

    Default

    In my b8200 it is M10x1 taper. You can order the part from several places for about $15 plus shipping.

    I went through a bunch of hassle trying to find a T with the right threads to add on a pressure gauge.

  8. #8
    Silver Member
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    Jun 2008
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    Location
    west virginia
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    1994 Kubota B7100 HST 4WD

    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    Quote Originally Posted by murky View Post
    I went through a bunch of hassle trying to find a T with the right threads to add on a pressure gauge.
    you eventually found a T with that thread or had to get an adapter?

    great i have tap, dies, and bolts of that size and bigger and smaller too so i should be able to easily figure it out. i work on Subarus which are all metric, my kubota oil filter is even the same as one of my Subaru's!
    1994 Kubota B7100 HST 4WD
    60" Kubota MMM, 48" Landpride Bush hog, snow blade, 6 blade disc, plow

  9. #9
    Silver Member
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    Jun 2008
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    west virginia
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    1994 Kubota B7100 HST 4WD

    Default Re: B7100 oil leak - sealing of oil pressure sending unit threads?

    Why not just loose the original oil light? Nice back up to have both I guess...just curious.

    So you thread the original sensor into one port of the T adapter.
    Then for an aftermarket oil pressure gauge will they fit into an M10 or I need an adapter?

    here is an M10 x 1.00 adapter that looks like it would work.
    VDO M10x1 Male T Adaptor

    here is one that fits into the tractor engine but all the ports are NPT so you'd have to convert the original sensor to NPT:
    http://www.ebay.com/itm/LMA-Oil-Pres...9737%26ps%3D50
    1994 Kubota B7100 HST 4WD
    60" Kubota MMM, 48" Landpride Bush hog, snow blade, 6 blade disc, plow

  10. #10
    New Member
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    Jun 2012
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    Location
    Camas, WA
    Tractor
    Kubota B8200HST, Craftsman LT2000

    Default

    The VDO doesn't fit. It is M10x1 straight and factory is M10x1 taper, at least on the B8200.

    I bought an adapter from UK that has male and female to match the tractor and pressure switch plus 1/8 NPT for standard pressure gauges (this is from memory but I can verify).

    I think the name of the company is Merlin. It was something like $30 or so shipped and maybe took 10 days. I haven't had a chance to install it yet. Too many projects and the new switch seems to work and light doesn't come on.

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