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Old 20-04-2015, 10:11   #16
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Re: Heat Exchangers

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Originally Posted by ranger42c View Post
I'm "mid-project" in that I've just finished flushing (descaling) our starboard engine. Haven't evaluated results yet; we'll do that when we run the boat this weekend.

The three most common commercial products (that I know of) are Rydlyme, Barnacle Buster, and Triton Green something-or-other. I used Rydlyme.

Pumped the stuff in through a flush valve between that seacock and the sea strainer, then through the fuel cooler, aftercooler, gear cooler, and heat exchanger. Capture for recirculation was from the discharge hose that leads from heat exchanger to exhaust elbow.

The water pump">raw water pump impeller has to be out of the way; I was due for replacement, anyway, so that was no hardship. The stuff is said to be OK for engine zincs when diluted to working strength; I didn't see any serious impact on existing zincs, but I was due for checking/replacing those, too.

I can't tell whether raw water flow has improved or not; might have. I'll get an operating temperature read-out -- for comparison to previous, and comparison to the as-yet-un-flushed port engine -- before deciding whether it was worth the effort. Or worth the effort doing it the way I did.

-Chris

Follow-up to this: a) the recently flushed engine is running at about 1-2F lower than the unflushed engine, and b) I didn't do it right.

I remembered this morning that I forgot to pinch off the feed to the dripless shaft seal... so most of the flush, they way I did it, was likely not as effective as it could have been.

Note to self: remember to re-read notes to self.

-Chris
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Old 20-04-2015, 11:05   #17
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Re: Heat Exchangers

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Originally Posted by ranger42c View Post
Follow-up to this: a) the recently flushed engine is running at about 1-2F lower than the unflushed engine, and b) I didn't do it right.

I remembered this morning that I forgot to pinch off the feed to the dripless shaft seal... so most of the flush, they way I did it, was likely not as effective as it could have been.

Note to self: remember to re-read notes to self.

-Chris
Have the same problem. Do some job that only comes up every few years and repeat the same mistake I did the last time because I forgot or couldn't find or didn't read the notes from the previous screwup.

My note to self. Find some way to keep important notes to self so I can find them again a few years later.
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