I did it on my old Atomic Four and used diluted vinegar. I let it sit in the block over night and then flushed with reduced city pressure water. The operating temp dropped from ~170 to ~140.
You wont believe that crap that comes out; it looks a little like salad dressing. ~Dan --- On Tue, 7/27/10, Robert Macura <[email protected]> wrote: From: Robert Macura <[email protected]> Subject: [IC27A] Universal 5411 Acid Flush To: [email protected] Date: Tuesday, July 27, 2010, 4:55 PM Hi Guys, My M15 is overheating, well part of it. After eliminating all the usual and figuring that only part of engine (cylinder head area) overheats I am leaning to acid flushing it. Since it was never done. I looked over the internet and it seems that acid flushing of sea water cooled engines is quite popular past time but also almost everybody does it differently; that is; use different acids (oxalic, muratic, vinegar?) different solutions (50%, 10% or "straight") and different times (2 minutes, 15 minutes, overnight). And of course there is http://www.rydlymem arine.com/ instructions. html Did any of you actually did it to your own engine, engine still works and you live to tell the story? If so please share. Thank you, Happy Sailing
