Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines 6CTA high Nitrite on coolant (DCA Test Strips)

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  • #126785

    Neto
    Participant

    So I changed the coolant on both of my 6CTA’s with regular ethylene glycol (prestone 50/50) and 32 OZ of DCA4 additive on each… After using the vessel for about 6 hours I checked the coolant with some Cummins  DCA test strips and I have high 50% freeze point, very high nitrite and 0 molybdenum, that takes me to the last item on the scale (see attached)…

    What am I looking at here? Did I add too much DCA4? How can I correct this, im guessing removing some coolant and add distilled water? I live in the Caribbean so freeze is no concern here.

     

     

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  • #126793

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    Probably what happened.. Does it matter? The jury is out my end.. 

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