Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-09-2011, 07:15   #1
Registered User

Join Date: Jul 2009
Location: France
Posts: 86
Yanmar 2GM20 Losing Cooling Fluid

hello

This morning before leaving , i checked the engine oil and cooling fluid

One of my engine, had no cooling fluid (i changed the fluid a week ago, and made one hours motor)

the expension box was full
the the "box" on the engine was empty

my oil level was a bit higher than usual, propably a bit of the fluid went down into the oil

or must have a leak somewhere

do you had this problem before ?
what do i have to check ?

thank you
__________________

__________________
phmadeira is offline   Reply With Quote
Old 25-09-2011, 07:35   #2
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
Re: yanmar 2GM20 loosing cooling fluid

Do you have a hot water heater plumbed into the engine?
__________________

__________________
Chief Engineer is offline   Reply With Quote
Old 30-09-2011, 15:39   #3
Registered User

Join Date: Jul 2009
Location: France
Posts: 86
Re: Yanmar 2GM20 Losing Cooling Fluid

Yes a do have a water heater plumbed into the engine?

I have two engine but the one with the water heater, have much more problem !!

what is the role of the water heater in my problem ?

thank you

__________________
phmadeira is offline   Reply With Quote
Old 30-09-2011, 20:57   #4
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
Re: Yanmar 2GM20 Losing Cooling Fluid

On some applications with a water heater an air lock develops in the line to and from the heater. This may cause the engine to overheat or appear to be loosing coolant.

If your water heater is above the engine. Fill the hoses with coolant from the water heater.
__________________
Chief Engineer is offline   Reply With Quote
Old 01-10-2011, 05:51   #5
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
Re: Yanmar 2GM20 Losing Cooling Fluid

Your problem could be as simple as an air bubble as another poster indicated or it could be quite serious. A higher than normal oil level indicates that coolant may be leaking into the oil. That is serious.

Fill all fluids to normal and start the engine. Leave the coolant cap (the one on the engine, not the reservoir) open. At the dock put the engine in gear, raise the rpms to about 1,000 and let it warm up. It will take 10 minutes or so to get hot.

Once the engine warms up and the heat exchanger (the one with the fill cap) is too hot to touch, look down inside the cap. If you see bubbles then that is exhaust leaking back into the engine water jacket, probably due to a blown head gasket (or much worse- a cracked block).

A bad head gasket can also allow coolant to leak back into the engine oil system causing the symptom you noted.

A definitive test for leaking coolant is to pressure up the coolant system (engine off) and see if it holds pressure. This takes equipment you can buy or hire a competent technician.

On the other hand if all you see is coolant when you look down and maybe see the level is lower than when you filled it cold, then it is an air bubble. Keep adding coolant until it stabilizes.

David
__________________
djmarchand is offline   Reply With Quote
Reply

Tags
2gm, 2gm20, yanmar

Thread Tools
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
If You're Thinking Yanmar, Think Twice Daedalusk Engines and Propulsion Systems 58 08-02-2014 11:26



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:22.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.