Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 28-02-2011, 17:41   #1
Registered User
 
Alecadi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
What Is the Right Operating Temperature ?

I hope somebody can help me on that.

My 35 Endeavour is fitted with a Yanmar 3HMF.
The engine is probably the original engine from 1984.

What should be the normal operating temperature on this kind of engine?
It regularly shows between 140 and 155 F , rarely 160 F, at between 1200 to 1500 rpm.
Never above, even when motoring for hours....

Is that normal? I thought this kind of engine would operate more in the 180 F.
This "low" temperature could harm the engine?

Is it a thermostat problem (stuck open) ?

Thanks for the help.
__________________

__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
Alecadi is offline   Reply With Quote
Old 28-02-2011, 17:56   #2
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: What is the right operating temperature?

First we need to know more about the motor. The temp should be between 160 & 190 F. And, I assume it has a heat exchanger.

Is your coolant clean?

Have you tested the gauge & sender? (most common error)

Have you checked the thermostat?

How long has this been happening?
__________________

__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 28-02-2011, 19:50   #3
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,455
Re: What is the right operating temperature?

Critical info: is it raw water cooled, or does it have a heat exchanger? If raw water, the temps you quote are correct, if fitted with a heat exchanger, something around 180 F is correct.

Cheers,
Jim
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Old 01-03-2011, 04:58   #4
Registered User
 
Alecadi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
Re: What Is the Right Operating Temperature ?

Tough questions... ;-) I'm very ignorant in this kind of things....

I have the boat since last June and it has been like that since.
This can harm the engine?

I think it is raw water cooling fresh water (coolant) so I supposed this is a heat exchanger?
Coolant is clean.
What and where is the gauge sender in a yanmar 3HMF? how do we test it?
We'll check the thermostat

Thank you both.
Alec
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
Alecadi is offline   Reply With Quote
Old 01-03-2011, 12:47   #5
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: What Is the Right Operating Temperature ?

Quote:
Originally Posted by Alecadi View Post
What and where is the gauge sender in a yanmar 3HMF? how do we test it?
We'll check the thermostat.
Alec
Here is an excellent thread that Gord posted a long while back.
Basic Engine Gauge Theory and Testing
This should get you going for this. Note: There is a difference between english and metric gauges. Yanmar has a mixture of both. Water temp is usually english oil pressure is metric. So consider the readings.

Parts list: http://www.yanmar.com.au/qrg/3hmf.pdf

Here's the Manual (part 1 & 2), if you don't have one. If not, you may want to save these on your computer.
http://www.sailkismet.com/Notes/ryan1.pdf
http://www.sailkismet.com/Notes/ryan2.pdf

The oil pressure switch is under the oil filter. See page 14-13 of the second pdf download.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 01-03-2011, 13:00   #6
Registered User
 
lannen's Avatar

Join Date: Oct 2003
Location: Gulfport Fl
Boat: Endeavour CC 40' AbbyGale
Posts: 177
Images: 9
Re: What Is the Right Operating Temperature ?

Howdy, I've got a 1985 40 Endeavour... Mine, and I think all of them did, came with Perkins engines. But enough of that...

Do you notice it running cooler in colder weather (winter water temps) and warmer in the summer (Florida bath water)?

Or is this a constant temp throughout the year?

Also, you might check here: Endeavour Sailboat Owners Forum
__________________
S/V AbbyGale
lannen is offline   Reply With Quote
Old 02-03-2011, 09:12   #7
Registered User
 
Alecadi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
Re: What Is the Right Operating Temperature ?

Thank you Delmarrey, very usefull.
And thank you all for the comments and tips.

lannen: so far I didn't see much of a notable difference between summer and winter.
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
Alecadi is offline   Reply With Quote
Old 02-03-2011, 12:24   #8
Registered User

Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,429
Re: What Is the Right Operating Temperature ?

Engine coolant temps depend on several factors.

Raw water cooled engines (raw water in the block passages) operate at lower temps because seawater will precipitate salts and foul the engine over 150-160 degrees. So they typically have a thermostat set at 145 or so.

Older fresh water cooled engine have a lower "radiator" cap let off pressure and typically have thermostats that begin to open in the 160 degree range. These engines operate in the 170-175 range.

Newer fresh water cooled engines have a higher pressure cap and have thermostats that open at 175 or so. They typically run at 180-190 at high cruising load. The 15 lb pressue cap increases the boiling temperature to about 225 so there is plenty of headroom for wot or some heat exchanger fouling.
__________________
djmarchand is offline   Reply With Quote
Old 03-03-2011, 11:42   #9
Registered User
 
Alecadi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
Re: What Is the Right Operating Temperature ?

A friend of mine gave me a good idea: he told me to buy an infra red thermometer with which I could accurately measure the temperature while under way.They can be purchased for under 30$ from Harbour Freight- The brand is Centec. He said they are very good and quite inexpensive.With it I could check the exact temperature and see if it's a sender/gauge problem before going further. Anybody has had experience with that kind of device?
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
Alecadi is offline   Reply With Quote
Old 03-03-2011, 12:03   #10
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: What Is the Right Operating Temperature ?

Quote:
Originally Posted by Alecadi View Post
A friend of mine gave me a good idea: he told me to buy an infra red thermometer with which I could accurately measure the temperature while under way.They can be purchased for under 30$ from Harbour Freight- The brand is Centec. He said they are very good and quite inexpensive.With it I could check the exact temperature and see if it's a sender/gauge problem before going further. Anybody has had experience with that kind of device?
There are good ones and cheap ones. I used them for measuring compressor case temps. But they will not measure the water temp inside unless the motor had been running for over a half hour, then it would be fairly close depending on the air circulation around the motor.


.
Attached Thumbnails
Click image for larger version

Name:	412jHQHpxsL._SL500_AA300_.jpg
Views:	106
Size:	10.5 KB
ID:	24475  
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 03-03-2011, 12:19   #11
Commercial Member
 
Mark Johnson's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: New Bern NC
Boat: Searunner 34 Trimaran
Posts: 1,565
Re: What Is the Right Operating Temperature ?

Quote:
Originally Posted by delmarrey View Post
There are good ones and cheap ones. I used them for measuring compressor case temps. But they will not measure the water temp inside unless the motor had been running for over a half hour, then it would be fairly close depending on the air circulation around the motor.


.
After installing a new thermostat, I got one of these IR thermometers, and took readings all over the top of the engine, near the thermostat housing, after running hard for 45 minutes. (Under load)

I was told by Mac Boring, that it should reach about 180 degrees, which it did.

BTW, "long term" running at below 2,500 RPM is death to a Yanmar...

Mark
__________________
Mark Johnson is offline   Reply With Quote
Old 03-03-2011, 12:44   #12
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: What Is the Right Operating Temperature ?

Quote:
Originally Posted by Mark Johnson View Post
BTW, "long term" running at below 2,500 RPM is death to a Yanmar...
For certain sizes of motors.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 04-03-2011, 10:11   #13
Registered User
 
Alecadi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: Marathon FL
Boat: Endeavour 35, 1984,
Posts: 937
Re: What Is the Right Operating Temperature ?

Delamarrey: Can you be more specific? which size of motors are we talking about?
Thanks
__________________
People spend time putting little boats in bottles, me I put bottles in my little boat...
Alecadi is offline   Reply With Quote
Old 04-03-2011, 13:45   #14
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: What Is the Right Operating Temperature ?

Quote:
Originally Posted by Alecadi View Post
Delamarrey: Can you be more specific? which size of motors are we talking about?
Thanks
I see you have a 35' boat so those numbers are probably OK since you have a higher RPM motor (25-40hp). Larger motors may not even goto 2500 RPM's. 2500 is about cruising speed for my 3JH4E, which starts to redline at 3000. But economically, 2000 is the best fuel wise.

Which motor do you have?
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 04-03-2011, 15:22   #15
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,455
Re: What Is the Right Operating Temperature ?

Quote:
Originally Posted by Mark Johnson View Post

BTW, "long term" running at below 2,500 RPM is death to a Yanmar...

Mark
If this is really true, one wonders why Yanmars have a good rep in the sailing world. Seems to me to cross that marque off my potential buy list. Anything that finicky doesn't belong on a cruising boat IMO.

Cheers,

Jim
__________________

__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Reply

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
How Do I Know if My Turbo Is Operating Properly ? duncan_ellison Engines and Propulsion Systems 10 11-10-2010 06:10
Low Operating Temp drh1965 Engines and Propulsion Systems 7 07-04-2008 17:58
Volvo MD2B operating temperature?? amity Engines and Propulsion Systems 1 03-09-2007 17:47
Operating RPMs Rippy Engines and Propulsion Systems 15 23-02-2006 05:51
Normal operating rpm Weyalan Engines and Propulsion Systems 3 19-12-2005 17:44



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:03.


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.