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Engine overheating

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Perttu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Perttu Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2016 at 15:45
Hello,

To add to this. This occurs only if you start the engine on port tack. This photo illustrates the problem. On port tack I am getting the overheat alarm very quickly after the start and the engine is not even warm at that stage - as said it can occur almost on idle revs after few minutes...

If the engine is  started on starboard tack it runs normally and I can even tack and no overheat occurs. 

- Perttu
Check my sailing videos - http://www.youtube.com/user/l11483?feature=results_main
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Fiona View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fiona Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2016 at 16:41
Originally posted by Perttu Perttu wrote:

Hello,

To add to this. This occurs only if you start the engine on port tack. This [COLOR=#ff0000]<span style="line-height: 16.8px;]photo</span>[/COLOR] i<span style="line-height: 1.4;">llustrates the problem. On port tack I am getting the overheat alarm very quickly after the start and the engine is not even warm at that stage - as said it can occur almost on idle revs after few minutes...</span>

If the engine is  started on starboard tack it runs normally and I can even tack and no overheat occurs. 

- Perttu

Perrtu! Your picture really convices me that this is the root of my problem. When I think about the fresh water heater on the star board side, it's evident that the expansion tank is the lowest point of the cooling system. Mine also overheat almost instantly when on the port tack. It will be interesting to see if the relocation will do the trick.

Will get back to you in this matter.

Cheers!
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Bruno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruno Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2016 at 02:13
My suggestion may be odd but check also your hot water tank circuit and coolant level. At lower revolution, your coolant is more solicited. 
Bruno

Hanse 400, 2010 Hull 660, sailing lake Champlain, VT USA
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2016 at 08:06
last year I noticed a reduced flow of water & i kept having toclean the filter. However, never having had a filter problem before I decided this winter to remove the exhaust elbow. The water inlet hole was clogged to within 6 or 7 mm diameter. I now suspect that this caused a back pressure on the pump so slight problems such as small amounts of weed in the filter had a greater effect
It may be that at different angles of heel the pump has to work harder .This may lead one to start looking in the wrong place
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Perttu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Perttu Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2016 at 17:52
Hello,

I did visit the Dusseldorf boat show yesterday and checked Volvo installation on various different boats, including Hanse.

With every boat expansion tank is located either above the engine or then moved to the other side of the engine so that it will be always level with heat exchanger.

- Perttu


Check my sailing videos - http://www.youtube.com/user/l11483?feature=results_main
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Zwerver View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zwerver Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2016 at 20:46
I had the same issue with my 325.
Has been solved by changing the location of the coolant storage vessel on top of the Volvo Penta.
I brought it up a few centimeters ( to the side of the compartment and  reconnected.
The problem seems to be that when motor sailing under an angle , the coolant forms sometimes an air lock  whcih restricts the flow in the internal cooling system
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 27 April 2016 at 17:52
I have had problems getting the seawater to run through the engine when I first put the boat back in the water.  One solution I now use is to run the engine at high revs immediately after starting as only then does the pump seem to prime.  The seawater pump has to pull a vacuum so that the water will flow through seawater strainer and I should think the problem will be worse on the tack that places the seawater strainer at the higher level.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout & shallow keel, normally based in Scotland
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Martin&Rene View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2016 at 17:59
Extra thought, before you start re-arranging items.  When you start the engine to run slowly to charge the batteries when sailing, check there is a good flow of water coming out of the exhaust.   The first flow of water can be just the water coming out of the exhaust waterbox, what you need to see is a continuous flow of water.  If there isn't,  then run the engine on high revs for a short period and hope this gets the whole system fully primed.

Another extra thought, the alternator output and battery charging rate increases significantly the faster you run the engine, so running it a low speeds is not achieving too much. 
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout & shallow keel, normally based in Scotland
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Fiona View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fiona Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2016 at 14:20
Did some testing. When I went to a regatta last year the engine overheated after going from my port and to the starting point of the regatta when i lowered the rpm from 1800 to 1000 rpm.

I attended the same regatta this year and did the exact same thing, going from my port to the starting point at 1800 rpm and lowered to 1000 rpm, result = No overheating this time.

I will give more feedback when I have more experience, but it looks promising.
How ever I still have some small leakage of freshwater, but itīs so little it is hard to tell where it origins...

Cheers!

//Magnus 


Edited by Fiona - 24 May 2016 at 14:21
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Sylvie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sylvie Quote  Post ReplyReply Direct Link To This Post Posted: 09 June 2016 at 14:18
thanks for the advice everyone , i have now moved my coolant header tank up  20cm unto the white bulkhead in the engine compartment and have motorsailed on port tack in 12 knots of breeze going upwind with full sail at 2000rpm  and have had no overheating problems whatsoever, unlike before
see photo
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