Tundra61

Hey All - what are some of your clever setups for winterizing closed loop cooling systems? I was thinking about a setup that uses a low volume transfer pump and flushing caps so I don't have to start the motors. BUT, was wondering if there are any risks of damage to the impellers by pushing the winterizing fluid though the system. Ideas/thoughts?

Trac Ecologic makes a few different flushing systems that gave me the idea, but seems like you could easily make one for around $100 vs paying $300+ for what they are selling.

NedLloyd

I trust you are asking about a true inboard. Pull the intake hose off the sea cock, stick it in a bucket of coolant, run the engine until the color comes out the exhaust, shut the engine down. If you want to you can then take the raw water pump V-belt off so you can start the engine periodically during the winter and let it run for a couple of minutes.

Tundra61

Yes true inboard.

rdiesel01

This

mystery

You aren't going to get AF past the impellers.....

Its super easy on my boat. I use a shop vac to blow out the line from strainer to thruhull, close the thrull as I'm blowing, then I start the engines and fill the strainer with 5 bottles of pink and 2 bottles of -100.

Jdow

Buy an additional strainer lid, drill and tap it for 3/4 npt, thread a 3/4 npt x garden hose fitting in, close the valve and attach your pump to it. Start the engine after the pump

Lorne Greene

I close the seacock and them blow compressed air through the system via flush port.

ontariospoiler

I've winterized my system every year without issue, the impellers will suck AF just like they will water, I have strainers, inline with the raw water pickup, close the seacock, open the strainer, pour AF into the strainer, start the engine, keep pouring AF into the strainer, till it starts coming out the exhaust, turn the engine off, DONE