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  1. #1
    New Member
    Join Date
    Oct 2015
    Posts
    19
    Location
    elida ohio
    Tractor
    kubota b9200

    Default blow by

    I own a 1989 B9200hst with a Montana FEL. my hour meter does not work, meter says 662 but I'm guessing is has 1000 hrs on it. I am starting to get some blow by out of the crank case vent with very little oil. I have no idea how much is normal or if I'm living on borrowed time. I have to use the glow plugs when starting cold (is that a sign of low compression?) a rebuilt engine is north of $3200 ouch! Any input would be greatly appreciated!

    thanks in advance

  2. #2
    Gold Member
    Join Date
    May 2008
    Posts
    390
    Location
    SW Washington
    Tractor
    L2550

    Default Re: blow by

    Quote Originally Posted by sebes View Post
    I own a 1989 B9200hst with a Montana FEL. my hour meter does not work, meter says 662 but I'm guessing is has 1000 hrs on it. I am starting to get some blow by out of the crank case vent with very little oil. I have no idea how much is normal or if I'm living on borrowed time. I have to use the glow plugs when starting cold (is that a sign of low compression?) a rebuilt engine is north of $3200 ouch! Any input would be greatly appreciated!

    thanks in advance
    Before I did anything engine wise I would be sure I had a good strong battery and good connections to get the fastest crank speed possible.

  3. #3
    Platinum Member
    Join Date
    Nov 2007
    Posts
    826
    Location
    PA
    Tractor
    Kubota L3130 HST 4x4 Kubota L4740-3 HST

    Default Re: blow by

    Blow by happens from day one as ring seal is never 100%. The real question is how much blow by are you getting. Oil will always be in the mist. Again it’s a matter of the volume. I’ve seen some engines have a spec for blow by where a flow meter is connect to the vent so the flow rate could be quantified. Having said that, The only proper way to assess ring seal is by compression and leak down testing.

    Is the oil contaminated? If ok I’d continue to run assuming power has not diminished, no odd engine sounds, etc.

    If you desire a new tractor use this as an excuse to buy a new one.
    Kubota L3130 HST 4x4, FEL LA723 w/QA and BH90 Backhoe
    Kubota L4740-3 Cab, HST, FEL w/Heavy duty bucket w/cutting edge
    Snow Blower: L2185 72" front mount w/hyd rotation and electric chute, 7' back blade, carry all, 48" Pallet Forks w/QA, Sun Shade, Turf tires & Rubber Chains for the winter, Extra forward and rear lighting. BearCat 73454 Wood Chipper. LandPride RCR2672 Rotary Cutter. Ballast Box Approximately 390 hours on L3130

  4. #4
    Veteran Member
    Join Date
    Sep 2013
    Posts
    1,528
    Location
    N. FL
    Tractor
    JD855, NH575E, Craftsman LT1000

    Default Re: blow by

    First thing to do for any signs of blowby is to check the vent system. If it has a PCV valve make sure it isn't clogged. Same for the hose and nipple. Some PCV nipples will have a small hole or orifice in them. Stick a wire down in that to make sure it isn't stopped up and the pressure can escape back into the intake.

    Before I rebuilt and engine for blowby I would add a vent or reroute the vent to a catch can. As long as you get it to start and run acceptably to get your work done that would keep it from blowing seals out. Leave the system with too much pressure inside and it will push out the engine seals.

  5. #5
    Veteran Member
    Join Date
    Dec 2012
    Posts
    1,664
    Location
    Williamstown Ontario Canada
    Tractor
    Kubota M7040 Nuffield 465

    Default Re: blow by

    Your tractor is dying for a few days of very hard work.

    If you are using a synthetic oil, stop. It is too good a lubricant and many diesels cannot keep their piston rings sealed when you use the synthetic.

    Diesels who spend their working time at med to high revs and no load develop a condition called "diesel slobber." You are in the early stages of this condition.

    The type of load your tractor needs is the pulling a heavy trailer up a long hill with the exhaust starting to blow a little black smoke. These loads build up high cylinder pressures and keep the rings seated against the cylinder walls. Pulling a plow through the field.

    Dave M7040

  6. #6
    Bronze Member
    Join Date
    Aug 2012
    Posts
    60
    Location
    Bartlett, TN
    Tractor
    Yanmar 2210, YM1900, 1963 Ford2000diesel, New HollandTC33

    Default Re: blow by

    Had an old Massey at the airport used to mow the rough grasses with a 10 foot bush hog. It developed blow by so bad that it would build up enough pressure to blow the dipstick out of the crankcase. We still mowed with it for over five years. Compression rings gone bad.

  7. #7
    Super Star Member
    Join Date
    Mar 2008
    Posts
    15,558
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: blow by

    Quote Originally Posted by sebes View Post
    I have to use the glow plugs when starting cold (is that a sign of low compression?)
    We have a B7500 and even when it's 90 out, you have to use the glow plugs to get it to start. I would not be concerned about needing to use the glow plugs to get it to start based on the experience we have had with our B7500.

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  8. #8
    Super Member
    Join Date
    Feb 2002
    Posts
    5,359
    Location
    western,pa.
    Tractor
    Kioti DK 35

    Default Re: blow by

    Quote Originally Posted by aczlan View Post
    We have a B7500 and even when it's 90ー out, you have to use the glow plugs to get it to start. I would not be concerned about needing to use the glow plugs to get it to start based on the experience we have had with our B7500.

    Aaron Z
    +1
    Some blow by is normal.
    Most of the kubota, Kohler and DaeDong diesel engines I have run all required the glow plugs to start since new.
    Is it using excessive oil ?
    If not it doesn't sound like you have an issue.
    Vince,
    Kioti DK 35
    Hustler Super Z

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