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The Norfolk Broads Forum / Broads Boat Owners Q & A / Diesel running cool?
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Posted By Discussion Topic: Diesel running cool?

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Diesel running cool?| diesel mixed with exhaust cooling water| Maintenance (Cooling Systems)| Water Cooling Filter or Filters.| Water Cooling Filter or Filters.|

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palmtree
Oct-22-2013 @ 7:54 PM                           Permalink
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Hi,

The boat Diesel engines (2.5di ex-transit)only heat up to 40degC when normal running at about 2000rpm. The book for the engine states the thermostat opens at 82degC so I did expect the engine to run hotter.

I am going to check out the thermostat, but before I do are for some reason marinised diesels set to run cooler?

Ian

rustic
Oct-22-2013 @ 7:59 PM                           Permalink
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Sounds like the thermostat, but it could be jammed partly open, with
some crud.

Thermostat easy to check if you have a thermometer and a pan of
hot water.



best regards, Richard.
I can't wait to be back on our boat on
the Broads.


This message was edited by rustic on Oct-22-13 @ 8:00 PM

16E
Oct-22-2013 @ 8:03 PM                           Permalink
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Hi Ian,

How is the cooling system configured:  Direct raw water, indirect raw water - that is a closed cooling circuit on the engine and then a separate heat exchanger to raw water,  keel cooled by an exterior tank?

It cetainly sounds like the thermostat is tuck open.

Mal
16E

There are two rules for sucess in life:

1, Never tell anyone everything you know.

650XS
Oct-22-2013 @ 8:12 PM                           Permalink
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naaaaa.............yer all wrong ....

give it a blanket..........

two paracetomal every 4hrs

and a nice drop orf the ole whiskey at bed time ....

.............ummmmmmmmmmmm.........

www.wayfordmarineservices.com

big mouth, large heart and gut
too....

try tell it how it is .....

mod that...........!!!!

palmtree
Oct-22-2013 @ 8:23 PM                           Permalink
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Mal,

Indirect raw water cooling system, and I do think there might be thermostat failure, however both engines are the same so there is a chance the thermostats have been removed from both.

Ian



This message was edited by palmtree on Oct-22-13 @ 8:25 PM

Mercator
Oct-22-2013 @ 9:15 PM                           Permalink
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don't forget the hottie bottle Jon  Evil Grin   always helps on cool runnings.

or

undo the thermostat plates and have a look

(girlies loves ingines  LOL)

Maggie
x

Steve & Maggie.

Magellan (Westward 38)

Not quite an ancient mariner ..... though some say he was at sea before Pontius was a pilate !

diastar
Oct-22-2013 @ 9:53 PM                           Permalink
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Think there was an answer to this some time this summer from Jason (Ludham Bridge Boatyard).

:)

SOS247
Oct-22-2013 @ 10:33 PM                           Permalink
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I would guess the thermostats are okay, if fitted. Its also unusual to have two engines faulty.....Thermostats just help to allow the engine to reach running temperature as quick as possible after starting up, but they do help to maintain it at the running temperature by restricting the flow.

However you can normally get an engine 'without' a thermostat up to running temperature and the 'design' of the cooling system wouldn't allow the engine to overheat. This will be the same on a hot sunny day or mid winter.  

Personally if it was my boat,  I would run the engines hard (90% max rpm) across Breydon or similar, this will soon tell up if there is a fault! But its difficult to do if the engines are getting on regards to age!

However, as you have TWO engines with the same issue it should then a slightly 'easier' problem to answer.....

Are the cooling systems 'factory' fitted? i.e. is it a D.I.Y heat exchanger/water pump etc?  Sometimes even a incorrect hose size on the discharge can improve engine temperature. Incorrect impellers, wear cams in pumps can all cause too much water to flow through the engine. Even a poor quality calorifier can cause issues but i guess there its only fitted to one engine.

My gut feeling,  is there isn't really a technical problem but further checks & information would be needed.

Hope this helps a bit!

Regards
Jason    

            

www.facebook.com/ludhambridgeboatyard



They say that 'Hard work never killed
anyone' however, sleepless nights,
stress, not taking breaks & not eating
correctly may just get you there early!!

Pandamonium
Oct-23-2013 @ 12:41 PM                           Permalink
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Its quite common for the thermostats to have been removed if the boat has been used primarily in salt water.

Cheers

Chris

palmtree
Nov-03-2013 @ 4:50 PM                           Permalink
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Had a look today and the thermostats have been removed, so will put in some replacements and see what happens.

Ian

Bitterend
Nov-03-2013 @ 11:36 PM                           Permalink
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If its not broke why try fixing it!!!

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