Opening it up cleans the other side too. You can't just clean the seawater side. Residue on the freshwater side is just as bad for cooling.
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Opening it up cleans the other side too. You can't just clean the seawater side. Residue on the freshwater side is just as bad for cooling.
So I assume that if plan A (remove to clean) and plan B (circulate entire system) were both done we would have a perfect job. Actually it really makes sense as Scott and Dan both made excellent points.
Walt
If you pull the HE and drop it into the acid, you are cleaning both the RW and coolant passages. That does NOT happen with the in-place cleaning which only cleans the RW side. One of the reasons for the oxalic acid per DD is that it adds effectiveness on deposits that can form in the coolant passages.
I saw an original post years ago, I believe from a guy in New Zealand with 692s with cleaned is exchangers while the were mounted to the engine by putting a pipe fitting and gate valve in the inlet zinc bung and filling the exchanger with mutiatic mix. He let sit for a few minute then clicked the gate vale that he used to enter the acid and started the engine to flush the acrid out through the exhaust. This post had great pics also. Anyone know how I can find have searched a lot no luck.
My mechanic has always used the DD muratic acid solution. I asked him to use Barnacle Buster last time. He was very impressed. Pricey but after his impression we will continue to use it.