Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-10-2017, 03:20 PM   #1
Newbie
 
City: Seattle
Country: United States
Join Date: Jan 2017
Posts: 4
Cold John Deere 6404

Have changed anti-freeze and thermostat. Engine will not heat up above 160 degrees. Book recommends 190.

It is a 1974 Ammarine conversion, used a barrel style thermostat. Would an automotive style with less flow ability help or cause water pump issues.

Thanks, Steve M
__________________
Advertisement

Steve M is offline   Reply With Quote
Old 01-10-2017, 06:02 PM   #2
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 4,968
Is the thermostat stamped with it's opening temp, and/or have you tested it in hot water to confirm what temp it opens at?

And how is your engine cooled? Keel cooler, or raw water heat exchanger?

And are you in particularly cold water?

And has it always been this way, or is this a new development of some sort?
__________________

__________________
www.MVTanglewood.com
twistedtree is online now   Reply With Quote
Old 01-10-2017, 07:21 PM   #3
Senior Member
 
alfamike's Avatar
 
City: Camarillo
Country: USA
Join Date: May 2015
Posts: 336
Engine temp

For John Deere's a lot of people (if raw water cooled with built in heat exchanger) put the t-stat in backwards by mistake.

Also they are a maintenance item, so replacement like you did is a good idea, however, could be wrong temp. Also new does not mean better, if their operation is in question remove & put in water on stove & monitor with candy thermometer to be sure opening at right temp..

Make sure it is in right.

Good luck,

m.
alfamike is offline   Reply With Quote
Old 01-10-2017, 08:28 PM   #4
Member
 
City: Westerly, RI
Country: USA
Vessel Name: Northstar
Vessel Model: Grand Banks 36 Classic
Join Date: May 2016
Posts: 11
My JD 6404 was running at 140 degrees. After changing the thermostat with no improvement, I found the temperature sender had gone bad. New sender solved the problem.
Hal Northstar is offline   Reply With Quote
Old 01-10-2017, 08:28 PM   #5
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,633
Have you verified that the gauge is reading correctly with an IR temp gun or some other independent gauge?
kchace is offline   Reply With Quote
Old 01-10-2017, 09:26 PM   #6
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 10,048
Did the temp change to 160 after you changed over the coolant and thermostat? Or did you change them because the temp was 160? If you changed something and the temp changed your likely culprit is the thermostat.
Make sure you have the right thermostat. For example, there are several different temp ones for Lehmans.
Shoot the sender with an IR gun to check the running temp.
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 03-04-2017, 04:24 PM   #7
Newbie
 
City: Seattle
Country: United States
Join Date: Jan 2017
Posts: 4
Cold John Deere 6404

Quote:
Originally Posted by Hal Northstar View Post
My JD 6404 was running at 140 degrees. After changing the thermostat with no improvement, I found the temperature sender had gone bad. New sender solved the problem.
My temp sender is ok - checked with a laser temp gun. How hot does your engine run now? Does it have the barrel style thermostat or the automotive style? Mine is the barrel style and to me it just looks like a flow through thermostat. It opens in a pan of hot water but I don't see how it makes any difference since it is just an open barrel between the top and the bottom of the thermostat housing.

Engine is a 1974 Ammarine conversion. It is raw water cooled with a heat exchanger. Have only had the boat since last June and that style of thermostat is what was in there and Hatton Marine who helped me change it wanted to stay with the same style but still at 160.
Steve M is offline   Reply With Quote
Old 03-04-2017, 09:33 PM   #8
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,267
Is it 160 at normal cruise or at the dock?
__________________
Don't believe everything that you think.
Xsbank is offline   Reply With Quote
Old 03-05-2017, 12:55 PM   #9
Newbie
 
City: Seattle
Country: United States
Join Date: Jan 2017
Posts: 4
Quote:
Originally Posted by Xsbank View Post
Is it 160 at normal cruise or at the dock?
160 at normal cruise, takes about 25 minutes to get there. I am in the northwest so the water is cold.
Steve M is offline   Reply With Quote
Old 03-05-2017, 10:27 PM   #10
Guru
 
River Cruiser's Avatar
 
City: UMR MM283
Country: US
Vessel Name: Northern Lights II
Vessel Model: Bayliner 3870
Join Date: Jan 2013
Posts: 1,350
If it's any help my NA Hino's will only run 160-165f at cruising rpm. WOT they'll get up to 175f, I'am on the Mississippi River and water temps run from the 40f to 80f.
__________________
Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.
River Cruiser is offline   Reply With Quote
Old 03-05-2017, 11:28 PM   #11
Guru
 
Join Date: Apr 2014
Posts: 1,288
My JD 6068 after cooled in the PNW cold water will run at 160-170 at slower speeds with less load and take several min. to get there, at 60-80% load they go to 170-180. The cold water is significant.
eyschulman is offline   Reply With Quote
Old 03-05-2017, 11:56 PM   #12
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,267
I don't see why the cold water matters as there is no circulation of the coolant through the heat exchanger until the thermostat opens. Just sayin...
__________________
Don't believe everything that you think.
Xsbank is offline   Reply With Quote
Old 03-06-2017, 07:47 AM   #13
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,849
Could the thermostat be installed inverted?
FF is offline   Reply With Quote
Old 03-06-2017, 12:47 PM   #14
Guru
 
Join Date: Apr 2014
Posts: 1,288
Quote:
Originally Posted by Xsbank View Post
I don't see why the cold water matters as there is no circulation of the coolant through the heat exchanger until the thermostat opens. Just sayin...
does the thermostat also affect the after cooler and if not will that affect the rate of warm up? I don't know for sure just throwing that out my motors have after coolers and I vaguely remember something about cold water and after coolers. If somebody out there knows please chime in.
__________________

eyschulman is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 02:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×