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07-27-2020, 09:12 AM
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#1
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Temperature issue
Hello from Distant.
Just had my perkins 4236 completely reconditioned. When I open valve to direct coolant through hot water tank,temperature increases,when it reaches 200 I shut the valve of and temperature drops back down to 185. I don't know how high it would go if I left valve open.
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07-27-2020, 10:17 AM
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#2
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Senior Member
City: San Diego
Join Date: Jul 2020
Posts: 478
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Did it behave that way before engine work?
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07-27-2020, 11:45 AM
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#3
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Senior Member
Join Date: Feb 2011
Posts: 303
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Temperature issue
Not much information here for remote troubleshooting but three thoughts for you:
1. If that is your temperature sender in the photo, with the water heater shutoff valve next in the same pipe, it could be that the actual coolant temperature does not change when the valve is opened. The increase could be due to coolant flowing past the sender when the valve is open, but the sender is in a blind pipe when the valve is closed.
2. The coolant flowing through the water heater is not being cooled nearly as effectively as the balance of the flow going through the heat exchanger. You could have too much coolant bypassing the heat exchanger via the water heater. Partially closing the valve would fix this. A globe valve is better for bypass coolant flow to bus heaters or water tanks as you can modulate the flow better.
3. Don’t forget that electric temperature gauges are notoriously inaccurate, and a different sender will give a different reading. Your 200 degree reading could be higher than the actual temperature, and hence less scary.
I would test with the heater valve cracked slightly, just enough to have flow, and see if the temperature stabilizes.
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07-27-2020, 01:41 PM
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#4
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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I had different engines before,did not have this issue.
I did open valve slightly to see if reduced flow would correct problem, but temperature still increased.
I am wondering if the location of the sensor is giving incorrect read out with valve open or closed,and which would be correct,valve open or closed. It is not actually in the head ,instead T'd into a line coming from the head
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07-27-2020, 01:55 PM
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#5
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Senior Member
City: San Diego
Join Date: Jul 2020
Posts: 478
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With different engines, isn't it possible that the plumbing needs to be different? This sounds a lot more complex because of that. I suggest a pro to figure this out. I'd even talk to the shop that put this engine in because they didn't plumb it correctly and they should correct it on their nickel. Have you spoken with them?
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07-27-2020, 02:14 PM
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#6
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Yes,did discuss it with them,and they don't understand why this is happening. However have recently discussed it someone who has been involved with marine engines for sometime,he' will look more closely at the issues and also will discuss further with those who did the work on the engine.
Thanks
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07-27-2020, 02:29 PM
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#7
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Senior Member
City: San Diego
Join Date: Jul 2020
Posts: 478
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In person, tracing hoses and knowledge of different cooling setups is your best bet. Please keep us posted as we all learn from this type of situation. Cheers.
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07-27-2020, 03:09 PM
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#8
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Thanks for your input....,cheers.
It would be interesting to see how someone with the same engine has their hot water tank connected.
Thanks again.
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07-28-2020, 12:01 PM
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#9
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Senior Member
Join Date: Feb 2011
Posts: 303
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Temperature issue
Quote:
Originally Posted by Distant
Thanks for your input....,cheers.
It would be interesting to see how someone with the same engine has their hot water tank connected.
Thanks again.
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I have a Perkins 4.236. My coolant for hot water tank circulates through a small heat exchanger on the hydronic heating system, which services the hot water tank plus the space heating. This makes no difference to what the engine cooling system sees, other than I may get a bit more cooling in the rare event that I use the engine heat for space heating. I leave both globe valves on the heating circuit wide open as I have never had an issue with overheating.
I do have two engine temperature senders. One located on the thermostat housing which serves the gauge on the flybridge. The second is located where yours is, serving the lower helm gauge. I do see a 20 degree lower temperature on the lower gauge, which I have never investigated, as they are both steady and consistent at all operating conditions. An IR gun on the head reads 185, which is what the upper gauge (sender on thermostat housing) reads.
For info I have the Bowman mani-cooler system. The engine is a 1999 vintage.
Photos below.
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07-28-2020, 03:13 PM
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#10
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Thanks for the info.
Both engines recently reconditioned,right engine runs and indicates 20° cooler than left, sensors in same location,however will check them more closely. Still working on some issues.
Thanks again.
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07-28-2020, 03:19 PM
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#11
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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My engines are around mid 80'S but recently reconditioned. Have not checked the make of the heat exchanger ,but will do.
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07-28-2020, 04:13 PM
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#12
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Guru
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,093
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Quote:
Originally Posted by Distant
Thanks for the info.
Both engines recently reconditioned,right engine runs and indicates 20° cooler than left, sensors in same location,however will check them more closely. Still working on some issues.
Thanks again.
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Swap the sensors just for grins.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
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07-28-2020, 05:56 PM
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#13
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Maybe will do.
Thanks.
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07-28-2020, 10:13 PM
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#14
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Senior Member
City: (Cypress Landing) Chocowinity, NC
Vessel Name: BZ interlude
Vessel Model: MS390
Join Date: Mar 2019
Posts: 243
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Your issue sound like the water is not circulating through the water heater properly. Also, the location of the temp sensor looks like its giving you the temperature of the dead leg. I suggest that you check the location of the return leg from the heater back to the engine.
Regards
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07-29-2020, 07:13 AM
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#15
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Thanks,will check return leg.
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07-29-2020, 07:26 AM
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#16
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Guru
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116 2008
Join Date: Oct 2017
Posts: 10,595
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Quick question and then I will observe.
Is the hot water heater electrically on, at the same time?
__________________
Two days out the hospital after a week in the hospital because of a significant heart attack.
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07-29-2020, 08:03 AM
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#17
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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No,no electrical on to tank at same time.
Thanks.
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07-29-2020, 08:18 AM
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#18
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Guru
City: Aventura FL
Vessel Name: Kinja
Vessel Model: American Tug 34 #116 2008
Join Date: Oct 2017
Posts: 10,595
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Hmmm restricted water flow, perhaps. Blow the coils of the hot water heater out.
__________________
Two days out the hospital after a week in the hospital because of a significant heart attack.
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07-29-2020, 08:30 AM
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#19
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,179
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Distant
Buy an IR gun. Your troubleshooting will be quick and accurate.
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07-29-2020, 10:46 AM
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#20
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Veteran Member
City: King's Point
Vessel Name: Distant Horizons
Vessel Model: 35ft custom built trawler
Join Date: Oct 2015
Posts: 26
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Yes,just recently started checking it all out,so will take all sugestions into consideration.
Thanks.
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