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I am in the middle of the 5 year rubber replacement. I just replace the radiator hoses which means I drained the coolant. In the Line Maintenance manual, 05-20-00, page 16, it says to flush the system when ever you replace the coolant.

On 12-20-00 page 26, paragraph 9.3 it says the system is flushed using pure water at a pressure of 2 bar (29 psi.).

What device do you you to flush the system at this psi?

I would think a water hose would be close to the 29 psi but water pressure varies from system to system . It would not be that accurate and I do not know how important that is.


Thank you,

Bob
  • Re: Flushing Cooling System

    by » 7 years ago


    If you have already completely drained the system and just replacing the same anti freeze just pour it back in. Shouldn't be hardly any coolant left after the hose change. Drain the reservoir to before the re-fill.

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


  • Re: Flushing Cooling System

    by » 7 years ago


    Thanks Roger.

    I am doing a 100 hour inspection on the engine at the same time.

    What we learned in your two day class last month has been a tremendous help.


    Bob

  • Re: Flushing Cooling System

    by » 7 years ago


    Hi Bob,
    Nice to hear from you again. Glad it's working out.

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


  • Re: Flushing Cooling System

    by » one month ago


    What if you are wanting to go from a generic Prestone "all vehicle" to Dex Cool. Is just draining the coolant sufficient or should we purge w/ distilled water as well?


  • Re: Flushing Cooling System

    by » one month ago


    The instruction to flush, is a hangover from when coolants often left significant deposits in the inside of the system. Modern coolant don't do this IF replaced at the manufactures recommended interval (or more frequently).

    The coolant I use is Castrol Radicool SF, which has a something like a 10 year lifespan in my Ford. I choose to replace my coolant at aproximately 2.5 year intervals. When I inspect the inside of the system its like new - no deposits! I also prefer to purchase the concentrate & carefully mix it, 50:50, with pure/distilled water.

    I support Rogers statement, with the proviso that you are replacing the old coolant with the same/compatible coolant.

    NOTE:  Go by the Rotax specifications for coolants. As a general rule, coolants that are compatible with modern European engines, will be compatible with Rotax engines. 

    If changing coolant type, flush!

    😈


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