[C320-list] Coolant system flush techniques?

[Warren Updike]

Re: disposing of antifreeze and oil. It's my understanding that any tire/auto repair facility is obliged by federal law/rule to accept used antifreeze and oil from the public. I could be wrong about that. I've been wrong before as I'm often reminded.
Can anyone confirm/deny that?

Warren and Pattie Updike
1994 C320 "Warr de Mar" #62


-----Original Message-----
From: Jeff Hare [mailto:Catalina at thehares.com] 
Sent: Thursday, July 30, 2015 9:57 AM
To: C320-List at Catalina320.com
Subject: [C320-list] Coolant system flush techniques?

First:  Yanmar 3GM30F  (European)

Seeing as our boat is out of service for a while, it's a good time to do a serious cooling system flush.  I see and feel some slime coating the surfaces where the antifreeze touches.  I've used the "drain a little/add a little" approach since we got the boat.

There are two AF drain ports I know about.  One on each side of the engine block.  One only drains down a little bit of antifreeze whereas the other is located lower on the block and removes quite a bit more.  So that takes care of draining some of it by gravity.   I don't know if the hot water heater system is drained or partially drained by this but I suspect not. 

So what's the best way you know to flush the slime out of the system in preparation for new antifreeze? 

-Jeff Hare
#809

PS:  I'm starting to collect quite a bit of used antifreeze in my garage... Having a hard time finding a place to take it here in NH.


-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of swampcreek42
Sent: Thursday, July 30, 2015 7:08 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] What antifreeze/coolant?


    
After flush #7 the water was completely clear. I replaced the thermostat and hose running from the t-stat to the heat exchanger, then being it was 10:00PM I went home. After work I'll go down and replace the other 3 hoses. I'm still deciding on weather to fill the engine with it's new coolant today since it won't be the recomended full 24 hours cure time on the thin coating of Permatex Ultra Black that I used on the t-stat gasket until 10:00PM tonight. Bruce Hunter Nauti Time #719 


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