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Closed-loop flush of MR-1 with Marine Descaler

njmr2fan

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CrankyGypsy

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I briefly considered CLR. but it's a mixture of things. I decided that a pure acid would be simpler in that I could neutralize it with just the soda ash. CLR is designed too dissolve a broad spectrum of deposits, whereas sulfamic "specializes" in destroying calcium carbonate.

but I might eventually give the CLR a quick test run with the Tums.
 

njmr2fan

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Since we regularly use it in our coffee maker to keep it scale free and rinse with Vinegar/Water after I figured it might be a safe bet for your descaling.
 

Cobra Jet Steering LLC

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Just a note, when you are fitting the P V C you said you had to sand it to get it to fit, here is a trick, heat the opening of the pvc cap with a heat gun, then while wearing leather welding gloves slide it onto the pipe and let it cool , this custom fits pvc to odd sized pipes quite nicely and easily.
 

Scottintexas

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@CrankyGypsy great write up, thank you for taking the time to do it, adding to the FAQ
 

Scoop

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Cranky Gypsy,

Very impressive thread! Your first boating adventure didn't happen to be a three hour cruise that turned into a few years on an deserted island all the while going by your other name - The Professor. :)
 

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Could you use a large bin as a catch basin and use a high volume pump to feed the solution into the flush port ?

Approximately how long did it take to set all the connections and then reassemble

Great job on the documentation
 

CrankyGypsy

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thanks @Cambo .

i'm not sure a high volume pump would overcome the limitations of the flush port - the diameter is so small. everything is already apart at that point, so you're not really saving any significant time. but it wouldn't hurt to try it out if you already have a high volume pump on hand, just let us know what you find.

time-wise, i can't recall exactly. plus, by the third time, i had the procedure down. building the assembly and moving the water boxes (tray removal) are the most time-intensive parts by far. breaking down between flushes took maybe 5mins. the whole flush schedule is easily completed within an hour (per engine). you should be able to disassemble, flush two engines, and reassemble with daylight to spare, especially if you build the assembly ahead of time.
 
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