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  1. #1
    New Member
    Join Date
    Mar 2012
    Posts
    3
    Location
    Denmark
    Tractor
    IH B-275, Power Trac PT-425

    Default Gasoline in engine oil on PT 425

    Hi there, new guy here. I hope you have room for a European in this forum

    After having read about the Power Trac and other machines for 3-4 years, I finally went ahead and bought a PT 425 a few weeks ago. I live in Denmark and bought the machine from a dealer in Holland. I think my PT may be the only one in Denmark.

    I've been very satisfied with it so far, but have detected a potentially serious problem.

    Last week, I changed the engine oil, as the dipstick unmistakenly smelled like gasoline. I let the engine oil out, and it was a very thin mixture of engine oil and gasoline. I drained approx. 3 liters from the engine, and that is twice the oil capacity of 1,55 liters.

    Needless to say, that I now change the oil before operating the PT, but I'm worried, that the engine may have suffered some damage, as a result of the high pressure caused by the extra gasoline, before I discovered the problem.

    As the machine has been in storage for a couple of years at the dealer, I suspected the carburettor float was stuck, letting gasoline seep into the cylinders filling them up, eventually finding it's way to the engine oil.

    I contacted the Dutch dealer, and he informed me, that he discovered the same problem before shipping the PT to me. He told me, that he has had changed the fuel pump and cleaned the carburettor, making sure the float was not stuck. After this he thought the problem was solved, but unfortunately it's not.

    I should tell you that I've put about 20 hours on the PT and it has the Robin engine.

    The engine has been pretty hard to start, but I dismissed this as me having to get used to the machine. However, I now believe that it may have to do with this problem.

    Have any of you guys experienced a similar problem, and what would be the solution to it?

  2. #2
    Platinum Member
    Join Date
    Dec 2011
    Posts
    835
    Location
    Wisconsin
    Tractor
    New Holland TC33D w/supersteer and loader

    Default Re: Gasoline in engine oil on PT 425

    I have had some Kohler command 20hp engines do the same thing. It seems the ones having a problem are on utility vehicles that bounce around alot. I have adjusted the float hight so there is less fuel in the float bowl. Some carbs that bounce around will let more and more fuel in when they should not.
    NH TC33D, Lorenz 5ft blower, KK 60" tiller, Kubota RTV900, Stihl 026, 029, 361, 460, Husqvarna 2100cd, 261, Speeco 25t splitter, Cub Cadet 982, Deere x744

  3. #3
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    18,159
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Gasoline in engine oil on PT 425

    Always check the oil level, and if it is high, it can only be gas or water.

    inspect the fuel needle seat and that the rubber tip is centered.

    I have the same leaking carb thing on a Honda engine. The float seems to cut the fuel off when I press on the float, but with the carb back together, gas leaks out the bowl. It has to be something like corrosion in the fuel inlet, or the needle seat is damaged.

    You could install a fuel cut off solenoid before the carb to insure no fuel flows past the solenoid.
    Attached Thumbnails Attached Thumbnails -fuel-shut-off-solenoid-jpg  
    Last edited by J_J; 05-21-2012 at 06:53 PM.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  4. #4
    Elite Member BobRip's Avatar
    Join Date
    Sep 2004
    Posts
    4,309
    Location
    Powhatan Va.
    Tractor
    2000 Power Trac 422

    Default Re: Gasoline in engine oil on PT 425

    I had this on a Chevy V8. It was the fuel pump diaphragm. The Robin engine fuel pump is run by pulsing engine vacuum. If there is a leak in this diaphram it might pull fuel into the engine. Try pulling a vacuum on the hose going between the engine and pump. Of course disconnect the engine end and tie your pump to that. I know the dealer replaced the pump, but it is worth a look.

    Welcome to TBN. We are always glad to help anyone with a PT.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  5. #5
    Platinum Member tmarks11's Avatar
    Join Date
    May 2005
    Posts
    691
    Location
    Port Orchard, WA
    Tractor
    Power Trac 422 (2005)

    Default Re: Gasoline in engine oil on PT 425

    If it is not the gas pump, as bob suggested, then it would be the stuck float scenario you described.

    Previous discussions that covered this included the info that the Robin user manual requires an inline valve on the fuel supply to prevent the flooding scenario when the engine is not in use. The solenoid valve on the fuel line does not shut off all fuel flow, and if the float sticks, the fuel will flood out the bowl and easily fill the crankcase through the rebreather line.

    Oh, and if it is the fuel pump, don't buy the robin version. Apparently much cheaper versions available (B&S? Will have to look for that thread)
    -----------------------------------------------------
    Now in Port Orchard, WA
    2005 PT-422
    4n1 bucket, minihoe, auger, 48" mower, land pride aerator, tow adaptor, forklift, crane, Herd GT77 spreader, LMB, 60" blade, box blade, M1 abrams turret.
    PT422 (6/23/05) photo page

  6. #6
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
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    18,159
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Gasoline in engine oil on PT 425

    Although my Kohler engine has the solenoid fuel shut off, I added a manual shut off valve also. I have had those solenoids jam and not shut off the fuel.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  7. #7
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    38,213
    Location
    Texas

    Default Re: Gasoline in engine oil on PT 425

    Many years ago, I had a lawnmower with a Tecumseh engine and every time I mowed the yard, I had to change oil because the crankcase would fill up with gas. A dealer told me I'd need to have a new short block which would cost as much as a mower, so I just bought another mower with a different engine. When I got a little older and more experienced, I had a little old 3.5 hp Briggs & Stratton engine on a spray rig that did that. A new carburetor fixed it. I suspect that might have fixed that Tecumseh if I'd known what I was doing. I've no experience at all with Robin engines, but I wouldn't be surprised if it's a carburetor problem
    Bird

  8. #8
    Elite Member BobRip's Avatar
    Join Date
    Sep 2004
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    4,309
    Location
    Powhatan Va.
    Tractor
    2000 Power Trac 422

    Default Re: Gasoline in engine oil on PT 425

    Quote Originally Posted by BobRip View Post
    I had this on a Chevy V8. It was the fuel pump diaphragm. The Robin engine fuel pump is run by pulsing engine vacuum. If there is a leak in this diaphram it might pull fuel into the engine. Try pulling a vacuum on the hose going between the engine and pump. Of course disconnect the engine end and tie your pump to that. I know the dealer replaced the pump, but it is worth a look.

    Welcome to TBN. We are always glad to help anyone with a PT.
    Most likely it is the carb. I just thought I would mention the fuel pump possibility.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  9. #9
    Veteran Member
    Join Date
    Mar 2010
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    2,122
    Location
    Ontario
    Tractor
    CT235

    Default Re: Gasoline in engine oil on PT 425

    Check the fuel cap to make sure it is venting. It takes very little pressure to overcome the needle and seat in the carb. If the cap is not venting pressure will build in the tank and push all the fuel in the lines past the seat.
    Tim.

  10. #10
    Veteran Member
    Join Date
    Jun 2006
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    2,178
    Location
    West Cascades Washington State
    Tractor
    PT 422

    Default Re: Gasoline in engine oil on PT 425

    Welcome!

    It's not a bad idea to add a manual fuel shutoff valve in the fuel line.

    Check the motor oil, turn on the fuel valve then start the motor. When you shut off the motor, turn off the fuel valve.

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