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Onan Drip Pan and Rail Assembly Removal

Discussion in 'Generators' started by GnC Hill, Jun 23, 2023.

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  1. GnC Hill, Jun 23, 2023
    #1
    GnC Hill

    GnC Hill New Member

    Joined:
    Jun 20, 2023
    Messages:
    2
    Location:
    Perth
    I have a 7MDKAL Onan genset on Riviera 36 SC FB and need to remove the rusted drip pan and rail assembly. From an earlier post, I saw some steps but wanted to find out what are the minimum components to remove before I can hoist it from its lifting point about 300mm to get access to the drip pan. I have taken front and back sound shield covers off and ideally keep it intact as much as possible to hoist safely.
    Has anyone tried this and what has to be disconnected prior to doing this? Attached a photo of installation and assembly diagrams. I have the installation manual but it does not give steps that can be reversed.

    Attached Files:

  2. Capt Ralph, Jun 23, 2023
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    13,270
    Location:
    Satsuma, FL
    If I remember correctly, The sound shield is built around the gen-set tray on lil rail thingies.
    Removing 1 or 2 of these rails and sliding out the gen-set pan does not look to difficult.
    There may be a static (ground) strap connecting the gen-set to the pan.

    The fun IS going to be;
    1) unbolting the pan from the boat (deck, stringer or frames).
    2) raising the gen-set assembly high enough from the pan/engine mount towers to clear, as it is slid out from underneath.

    You probably will not be able to find a new pan.
    We have had to media blast and rebuild pans before.
    I always wanted to powder coat them but time/budgets never allowed that.
    So primed and painted well, the rust came back, usually at the new welds.

    Remember, once you start, Pandora's box is opened.
    New motor mounts
    New exhaust riser
    New exhaust hose
    Fuel hoses
    New fancy clamps
    H/E service
    Head valve adjustment
    New raw water pump
    Aerosol Overhaul

    Thoroughly inspect the deck under the gen-set .

    If it is high hour and the boat is a keeper, You may consider a new gen-set.

    Be careful and keep us posted
    GnC Hill likes this.
  3. GnC Hill, Jun 27, 2023
    #3
    GnC Hill

    GnC Hill New Member

    Joined:
    Jun 20, 2023
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    2
    Location:
    Perth
    Thanks Capt Ralph, Pandora's box indeed.
    We have managed to get all the covers off and access to all the bolts to hoist (full day of tight spaces).
    The genset has 2000 hours so still in serviceable condition.
    This weekend we will disconnect fuel lines and raw water intake and hoist.
    Pan is very rusted. We have found a supplier to re-manufacture if blast and paint not an option.
    The more fun bit will be getting it back together again, then full service and recommissioning.
    Thanks for your advice. IMG_4614.JPG
  4. Capt Ralph, Jun 27, 2023
    #4
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    13,270
    Location:
    Satsuma, FL
    I always liked those lil Kubota engines.
    A bud gave me a 9kw OhNo with a dud electrical end. I Bolted on a Nex-Gen (Stamford) gen end on it, installed it in our Bert as lil genny.
    3k hours plus what ever time was on it before, still the best lil gen-set I have ever messed with.
    GnC Hill likes this.
  5. MBevins, Jun 28, 2023
    #5
    MBevins

    MBevins Senior Member

    Joined:
    May 23, 2008
    Messages:
    1,224
    Location:
    Windsor On. Canada
    You mentioned you have a fabricator in case you can't clean and paint.
    With all the work involved to remove the pan, I'd suggest you bite the bullet and have them Fab you a Stainless pan and just be done with it. Just make sure he knows how to fab SS.
    GnC Hill likes this.