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Light tower deutz fills crankcase w diesel

Discussion in 'Other Construction/Demolition Equipment' started by oceanobob, Oct 13, 2018.

  1. oceanobob

    oceanobob Senior Member

    Jun 13, 2010
    general contractor
    oceano california
    We were told to check the oil and water etc every time before starting a machine. The consequences of not doing this AND having some engine or 'system' screw up (as told to me) would earn that person a lifetime sentence to a life without a wheel:
    no skateboard, no bike, no m/c, no car, no ride in a car truck or train.
    That story is for those who say "I look on the ground and seeing no leaks I say I checked it".
    About 2 yrs ago we went to the yard to get the light tower for a concrete pour. The ground was clean, one tire was low but filled right up. We checked the oil and YIKES it was full to the point of overflowing. We were in horror and we realized it wasn't water which is what we feared but was diesel fuel!?!. We drained it and rotated the engine by hand and then refilled w new oil and it started up - yes, it smoked a bit for a while but otherwise fine. Conclusion was the mechanical fuel pump was leaking into the engine which it shouldn't do but this is a deutz and we aren't that familiar ...so we replaced the fuel pump w new oem.

    Last week when we went to get the machine, found no stain on the ground and tires ok but a little low, and we checked the oil. Shucks, full of diesel fuel again.

    The tank is in the frame (tube steel) the vent is clear and it wasnt totally full either. With the entire engine above the frame, how in the world can the fuel injector siphon the fuel into the engine? Should we cut in a quarter turn ball valve after the fuel pump prior to the fuel injector? Will it get airbound and not start once we install that valve?

    Or is it maybe the fuel injector pump leaking that fuel into the engine?

    The machine runs like a singer sewing machine. Pics enclosed. Engine is single cylinder air cooled deutz, the genset is 240 vac and doesnt seem to have a neutral (so we dont use it for tools plus we have small inverters for that). Makes nice light for these times of the year when concrete tends to run late so we run this to get the first out the gate concrete. Has four 1000w metal halide lights.
    Concrete under the light tower means no sun to cook the stuff before one is ready to finish.
    IMG_0207.jpg IMG_0209.jpg
  2. thepumpguysc

    thepumpguysc Senior Member

    Mar 18, 2010
    Master Inj.Pump rebuilder
    Sunny South Carolina
    If the supply pump fixed the problem 2 years ago.. & now its happening again.. change the lift pump again.
    Putting in a shut-off valve is a very good idea.. DO IT.
    Put it in the line coming from the tank & BEFORE the lift pump.
    The little lift pump is just a simple diaphragm pump.. the rubber will get hard & split especially depending on the type of fuel your using & the additives your putting in the tank, if any.
    IT IS possible for the fuel to be coming from the injection pump, but that usually only happens when its running.. because if ya think about it, the fuel would have to make it thru the supply pump first..
    Has anybody ever checked the oil after a nite use??
    Hope this helps.
    funwithfuel likes this.