Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines pull aftercooler/heat exchangers -> before of after winterizing?

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  • #77952

    longbeachisland
    Participant
    Country: United States

    Hello all – I have ’06 QSB 5.9 355’s and I want to pull my coolers/exchangers to have them serviced via the seaboard method over the winter.

    The crux is I need to winterize my engines in November. If I fully winterize with antifreeze then remove the coolers/exchangers is this the correct order of operations? Will removing the coolers/exchangers post the antifreeze flush effectively ‘un-winterize” my engines and cause all the antrifreeze to drain out?

    I assume I’ll need to service the coolers/exhchangers in the spring if that is the case. Any/all help welcome. thanks!

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  • #77956

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    You will be fine as long as whatever residual is left remaining is the winterizing antifreeze, not water, which it should be as long as you do your antifreeze procedure 100% thoroughly as if the coolers were not being pulled. Yes when you start removing things the antifreeze will drain from high spots (no biggie) and remain in low spots (this is good) but the key is doing that full winterization before you start removing anything.

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