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I own a Tecnam P92 Echo Classic Deluxe with a Rotax 912 ULS2 engine. Intending to replace the cooling rubber tubes after 5 years of service, I ordered the Rotax part no 922250 water tube (covering parts 922360-922364 in the enclosed IPC pages). This is a 17x4 mm tube (25 OD). However, while setting to do the operation, we found that the IPC does not show the 2 tubes connecting to the coolant radiator that are bigger in diameter (34 mm OD). The vent tube from the expansion tank to the plastic reservoir is also not shown. Since they don't appear in the IPC and I dont have a cat number, nor specifications for them, I'm not sure what to purchase. Any ideas? 

9841_1_IPC_912-914_e4r4-exp tank with hoses and connections only.pdf (You do not have access to download this file.)
9841_1_20230524_110906.jpg (You do not have access to download this file.)
  • Re: replacement cooling system hoses

    by » 12 months ago


    I don't know what rules apply in your country however your local automotive parts supplier should be able to assist you - I use, almost exclusively, Gates products as they provide extensive technical specifications for their hoses, that meet/exceed Rotax specifications.

    "Intending to replace the cooling rubber tubes after 5 years of service, "

    FYI; The 5 year rubber replacement is for ALL rubber, not just hoses/tubes

     


    Thank you said by: Gideon Miron

  • Re: replacement cooling system hoses

    by » 12 months ago


    I use Gate's hose too. You.must use the 17mm hoses on top and the two 17mm hoses under the cylinders. The larger

    25mm / 1 inch hose to the radiator from the expansion tank and the other one from the radiator to the coolant pump can be purchased locally. There is nothing special about these two 25mn / 1 inch coolant hose so long as they meet specs.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: replacement cooling system hoses

    by » 12 months ago


    Thanks for the replys. In the meantime I found that the coolant large lines and the oil lines are supplied by Tecnam, the airplane manufacturer and appear in their IPC, and I'm awaiting their quote. The issue is more complex than just the tubes since some of them have formed metal crimp connections, so it's either getting the tube/hose with the connections or replacing both tubes and connections.

    As to the 5 years replacement, yes we know and already replaced fuel lines, rubber gaskets, rubber flanges and carb parts and every other rubber parts. Thanks.


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