Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 21-04-2022, 16:06   #1
Registered User

Join Date: Apr 2022
Posts: 3
Cooling System Losing Water

My 1996 Volvo Penta MD22L is losing all of the freshwater in the cooling system.

While running at 2,400rpm we Heard a loud pop and then the engine began to overheat. When we looked in the radiator there was no water in the freshwater side, which was full when we started. There was no water at the bottom of the hull and no water in the oil. When we filled it back up and ran the engine it drained in 5-10min.

Any idea what the issue may be? All ideas are appreciated!
S.V. Taco Truck is offline   Reply With Quote
Old 21-04-2022, 16:40   #2
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,969
Re: Cooling System Losing Water

Sounds like the heat exchanger is broken internally and your exhausting the water. Make sure it does not back drain into the engine. That’s my best guess
Rumrace is offline   Reply With Quote
Old 22-04-2022, 08:20   #3
Moderator
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 6,084
Re: Cooling System Losing Water

Rumrace is 99 & 44/100% right.

Quick test: Dump a bottle of food coloring into a bucket of water and then use it to fill the cooling system. Start the engine, and watch the raw water where it leaves the boat.
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 22-04-2022, 09:05   #4
Registered User
 
Shrew's Avatar

Join Date: Aug 2010
Posts: 3,150
Re: Cooling System Losing Water

You could also check the oil to see if you 'grew' any more while it sat in the oil pan.

Check the bilge.

If the coolant isn't in the heat exchanger, isn't in the oil and isn't in the bilge, then the most likely probability left is that the coils in the heat exchanger are passing from the higher pressure closed cooling side, to the low pressure raw water cooling side and evacuating with the exhaust.
Shrew is offline   Reply With Quote
Old 22-04-2022, 09:18   #5
Registered User

Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 1,342
Re: Cooling System Losing Water

Check if the leak is not in the coil in the water heater. Mine had a pinhole and wall water ended up in the engine coolant system.
sailormed is offline   Reply With Quote
Old 22-04-2022, 12:20   #6
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,969
Re: Cooling System Losing Water

Use red food colouring and scream out “ shark”
Rumrace is offline   Reply With Quote
Old 23-04-2022, 05:37   #7
Registered User

Join Date: Nov 2005
Location: Oyster BAy NY
Boat: Catalina Mk1 36
Posts: 85
Re: Cooling System Losing Water

Ha!
Had a similar problem of losing fresh water, couldnt figure out where it was going. Did all the similar investigation you outlined, no luck. Mine was a slower loss than yours.
Made my way into the aft cabin yesterday to tighten some lag bolts on the rear
motor mounts, when a slow drip from the HE hit me on the hand. It was green, culprit found!
Interesting is you would expect to find such a leak as colored by the antifreeze, must be so diluted by the time it hits the bilge I couldnt see it.
__________________
G
Gary Matthesen is offline   Reply With Quote
Old 23-04-2022, 08:49   #8
Registered User
 
Lancerbye's Avatar

Join Date: Mar 2007
Location: Cormorant Island, BC, Canada
Boat: Lancer 44 Motorsailer
Posts: 1,877
Images: 38
Re: Cooling System Losing Water

Also check the hot water after applying a dye, if you have engine heated hot water. I have seen this happen when the coils in the hot water tank corroded.
__________________
The basis of accomplishment is in never quitting
Mengzi Meng-tse
Lancerbye is offline   Reply With Quote
Old 23-04-2022, 09:28   #9
Registered User
 
sailon46's Avatar

Join Date: Jun 2015
Location: Houston
Boat: Beneteau Sense 46
Posts: 360
Images: 2
Re: Cooling System Losing Water

In my similar situation I was in Curaçao and ended up with a freeze plug having a big draining hole. Because was under the Turbo in. Yanmar 100 permatexed it and 5000 miles later still there no leaks
sailon46 is offline   Reply With Quote
Old 23-04-2022, 10:46   #10
Registered User

Join Date: Feb 2012
Location: Martinique Island French Caribbean
Boat: Cal-40
Posts: 420
Re: Cooling System Losing Water

Most likely as the freshwater side of the pump produces higher pressure then the saltwater pump as the engine was running the freshwater side was forced into the saltwater side and out the exhaust as a result of a failure in the heat exchanger.
Siberian Sea is offline   Reply With Quote
Old 23-04-2022, 11:00   #11
Marine Service Provider
 
boatpoker's Avatar

Join Date: Nov 2008
Location: Port Credit, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 7,225
Re: Cooling System Losing Water

Quote:
Originally Posted by S.V. Taco Truck View Post
When we looked in the radiator there was no water in the freshwater side, which was full when we started.

Any idea what the issue may be? All ideas are appreciated!
Are you running water in your closed cooling system rather than coolant ?
__________________
If you're not laughing, you're not doin' it right.
boatpoker is offline   Reply With Quote
Old 25-04-2022, 10:42   #12
Registered User

Join Date: Apr 2022
Posts: 3
Re: Cooling System Losing Water

I will try the food coloring idea when I get back to the Marina. If that doesn’t yield anything, I will pull the tube bundle (what apparently the Brits l LLP call a tube stack). If that doesn’t yield anything, I’ll move on to pulling the whole heat exchanger. Just frustrating, as I just replaced the water pump on the same engine and was planning on rebuilding the whole thing in a year anyway. Thanks for all the suggestions!
S.V. Taco Truck is offline   Reply With Quote
Old 25-05-2022, 07:58   #13
Registered User

Join Date: Apr 2022
Posts: 3
Re: Cooling System Losing Water

Problem solved. Somehow a path from the freshwater side to the exhaust port flange formed. I assume age and casting imperfection. This allowed the coolant to drain into the exhaust.
Click image for larger version

Name:	IMG_2614.jpg
Views:	39
Size:	72.3 KB
ID:	258365
S.V. Taco Truck is offline   Reply With Quote
Reply

Tags
cooling, engine, engine cooling water, leak, leaking, Radiator, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Alternator cooling cooling fan akopac Electrical: Batteries, Generators & Solar 8 24-05-2020 11:22
Universal 5411 - Cooling System Failure and Fresh Water Conversion pmeyer Engines and Propulsion Systems 2 02-05-2015 06:35
losing prime in cooling? shorebird Engines and Propulsion Systems 2 13-01-2014 07:06
Yanmar 2GM20 Losing Cooling Fluid phmadeira Engines and Propulsion Systems 4 01-10-2011 04:51
Raw Water Cooling System jjorg Engines and Propulsion Systems 14 16-01-2008 12:49

Advertise Here


All times are GMT -7. The time now is 22:32.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.