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Kohler Generator 6.5 oil leak

Discussion in 'Generators' started by Shari Potts, Aug 5, 2020.

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  1. Shari Potts

    Shari Potts New Member

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    Good day, I have a kohler generator 6.5 that is leaking excessive oil. Am looking for seal part numbers that I should order before I take it apart.

    Any help would be appreciated!

    Shari
  2. Capt J

    Capt J Senior Member

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    WHERE is it leaking from and what seals do you need? Model and serial number would help. Emailing a Kohler dealer would be your best bet.
  3. Oscarvan

    Oscarvan Senior Member

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    There's a lot of gaskets and seals in there......
  4. Capt Ralph

    Capt Ralph Senior Member

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    Would that be a diesel or gas 6.5?
    Sure could use a model number.
  5. Capt Ralph

    Capt Ralph Senior Member

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    Did we chase the OP away that soon?
  6. Shari Potts

    Shari Potts New Member

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    20200806_164326.jpg Hi thanks for the comments,
    Model # 6.5ESZ
    S/N 483107
    SPEC 125253

    Oil seems to be coming from underneath the oil pump, near the engine/stator flange?
    Has anyone seen this before and is it an easy fix?

    Thanks in advance.
  7. Alzira II

    Alzira II Member

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    I rebuilt a could 15kw gas units this winter with the 1.6L vortex engine and only after putting the first together realized it had a leaking seal where shaft enters gen unit. That was a real pain to tear back down.
  8. Capt Ralph

    Capt Ralph Senior Member

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  9. Shari Potts

    Shari Potts New Member

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    Thank you Capt. Ralph! Much appreciated!

    Anybody, is this a job that I can do without special tools?
  10. Capt J

    Capt J Senior Member

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    Always test run small motors on a bench, before you install them! Saves a lot of hassle later. Should put assembly lube on that area of the crankshaft for lubrication during startup.
  11. Capt Ralph

    Capt Ralph Senior Member

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    I'm not a small gas person. I just happen to be around somebody else's bench.
    Have you checked the oil filter seal/ring or changed oil filters?
    After that, the only external place oil would leak from under pressure would be the oil pump cover with a failed gasket. I'm still leaning towards a bad oil filter seal.
    I do not recall the rear oil seal or the head galleries but knowing Kawasaki, there are not many places for oil to leak from.
  12. Shari Potts

    Shari Potts New Member

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    Good Morning, have ordered the seals and gasket for the oil pump and a new filter, that will be the first thing I try!

    Thanks for everyone's help!
  13. Oscarvan

    Oscarvan Senior Member

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    How about looking wiping and seeing where it’s coming from.
  14. MBevins

    MBevins Senior Member

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    Even if he doesn't degrease the outside, I'd put die in the oil, run it for a couple of hours and then look for the dyed oil using a UV light.
    Easy peasy.
    Now you really know what your dealing with.
  15. Pascal

    Pascal Senior Member

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    Isn’t the oil pump inside the sump? Confused at to how the oil pump could leak outside.
  16. Capt Ralph

    Capt Ralph Senior Member

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    On many Pac-Rim small engines, the oil pump is mounted outside the block.
    Some like the old Mopar blocks, other flush on the cast iron.
    The small engine idea was to keep the engine height down, small sump, oil pump to the side.
    It the case of this engine, they even leaned/slanted the engine over near like a pancake Detroit.
    Plumbing was cast into the block also, reducing extra or repetitive parts.
  17. Pascal

    Pascal Senior Member

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    Thanks. I learned something.

    although on a generator height is not that critical... except maybe very small units on small
    Boats
  18. ekaske68

    ekaske68 New Member

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    I might have the same oil leak issue. Did you figure out where the leak was coming from?