Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 06-08-2010, 17:31   #1
Registered User

Join Date: Jun 2009
Location: North, Va
Boat: pearson invicta mk2
Posts: 58
Thermostat ?

Is there a need for a thermostat on a seawater cooled Yanmar 3GM30? It is nto a closed system. I now have one. I have not installed it and was thinking about the need for it because it is not a closed fresh water system. I don't know? temp is right at 100degrees, and does not fluxuate as it.
any knowledge is appreciated. Thank you in advance, David
nico105 is offline   Reply With Quote
Old 06-08-2010, 17:40   #2
Eternal Member
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
100 degrees is too cold for the engine.

I will not go into a long dissertation as to why it is a bad idea.
Chief Engineer is offline   Reply With Quote
Old 06-08-2010, 17:51   #3
Senior Cruiser
Opie91's Avatar

Join Date: Apr 2009
Location: CT
Boat: C&C 34
Posts: 838
You need a thermostat even in a raw water system.

Is that temperature 100 C or F? The reason I ask is that the salt in salt water will crystallize at 165 F (74 C). So 100 C would be not a good thing. I am not really familiar with your particular engine, but all of the raw water cooled thermostats that I have seen are 160 F or less.

Also you do not want 100 F either (if the gage is right), the engine needs to be a little warmer to allow for a better fuel burn.

Here is the link for Yanmar FAQs:

Opie91 is offline   Reply With Quote

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
Thermostat Captin_Kirk Engines and Propulsion Systems 2 19-04-2010 07:25
Thermostat Needed? Milton Bertin Engines and Propulsion Systems 11 17-07-2009 06:54
Removing the Thermostat limmer Engines and Propulsion Systems 8 26-05-2009 13:11
Need Force 10 Stove Thermostat gbanker Construction, Maintenance & Refit 1 15-05-2009 10:41
Thermostat replacement drh1965 Engines and Propulsion Systems 3 03-02-2008 14:19

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:33.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.