Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Reload this Page >

Winterizing Closed Loop Cooling System

Notices
The Boating Forum

Winterizing Closed Loop Cooling System

Old 11-06-2020, 07:45 AM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: May 2020
Posts: 40
Received 1 Like on 1 Post
Default Winterizing Closed Loop Cooling System

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.
Old 11-06-2020, 10:33 AM
  #2  
Senior Member
 
Join Date: Oct 2014
Location: N.E. CT
Posts: 4,035
Received 1,762 Likes on 875 Posts
Default

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.
Likes:
clv
Old 11-06-2020, 01:35 PM
  #3  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: May 2020
Posts: 40
Received 1 Like on 1 Post
Default

Originally Posted by NedLloyd View Post
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.
Yes true inboard.
Old 11-06-2020, 02:40 PM
  #4  
THT Sponsor Admiral's Club Member
THT sponsor
 
Join Date: Jan 2008
Location: Long Island NY
Posts: 1,640
Received 249 Likes on 156 Posts
Default

Originally Posted by NedLloyd View Post
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.
This
Old 11-06-2020, 02:42 PM
  #5  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2007
Posts: 17,340
Received 2,782 Likes on 1,984 Posts
Default

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.
Likes:
Old 11-06-2020, 04:19 PM
  #6  
Admirals Club Admiral's Club Member
 
Join Date: Aug 2016
Posts: 423
Received 116 Likes on 88 Posts
Default

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

Last edited by Jdow; 11-06-2020 at 04:31 PM.
Old 11-06-2020, 04:23 PM
  #7  
Admirals Club
 
Join Date: Nov 2016
Posts: 3,522
Received 3,394 Likes on 1,534 Posts
Default

I close the seacock and them blow compressed air through the system via flush port.
Old 11-06-2020, 06:49 PM
  #8  
Member
 
Join Date: Mar 2020
Posts: 62
Likes: 0
Received 26 Likes on 15 Posts
Default

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
Likes:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.