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Engine overheating

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Fiona View Drop Down
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    Posted: 07 January 2016 at 15:16
My engine does overheat sometimes.
But only at low rpmīs . I can run the engine at 1800 rpms for hourīs on end without overheating.

But going from 1800 rpm to a 1000 rpm results in overheating after just a few minutes.

Under sail and just need to charge the batteries for a while I have the motor running a little over idle and after just 10 minutes itīs overheats.

I suspect that it could be that the expansion bottle is mounted to low relative to the freshwater heater.
I have now moved the expansion bottle (see pic below) from the original mountīs on the engine to the side wall of the engine room, but since itīs winter and the boat is a shore, I havenīt made any tests yet.

I have replaced the impeller and cleaned out the cooling fluid, the old impeller was undamaged so there was no rubber parts clogging up the system...

It would be interesting to know If anybody else have had this problem?

Cheers!

Magnus


Edited by Fiona - 07 January 2016 at 15:25
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Mark_J1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark_J1 Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2016 at 19:41
Thermostat replaced?  Has the impeller ever failed?  Might leave a partly clogged heat exchanger.
Hanse 400e "Grey Goose" Hull #31
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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: 07 January 2016 at 22:04
Originally posted by Fiona Fiona wrote:

It would be interesting to know If anybody else have had this problem?

Hi Magnus,

I have had exactly the same issue with my 355. Root cause is what you have discovered so I'll never start the engine on port tack.
 
I am planning similar modification to get rid of the issue. Local Volvo guys are confident that issue will be solved then. 

- Perttu
 


Check my sailing videos - http://www.youtube.com/user/l11483?feature=results_main
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High Time View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2016 at 22:26
Maybe you are not getting enough cooling water flow at low revs. I can think of 2 reasons this might happen.

Firstly, your water pump or impeller may be defective and not pumping effectively. However, you have recently changed the impeller and cleaned the pump so maybe this is not the problem.

Alternatively, you may have a small air leak in the sea water intake circuit before the pump i.e on the suction side. The most likely cause of this is a poor seal on the lid of the sea water strainer. If air is entering here the suction is reduced and hence the flow of cooling water is also reduced. I had this problem on a previous boat and finally replaced the poor Volvo strainer with a better designed system from Vetus. 
Roger

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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 08:11
[QUOTE=Mark_J1]Thermostat replaced?  Has the impeller ever failed?  Might leave a partly clogged heat exchanger.[/QUOTE]

Hi as I said the impeller never failed. Cleaned out the whole system. If it was the thermostat, would it run ok @ 1800 rpm???

Cheers!

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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 08:15
Originally posted by High Time High Time wrote:

Maybe you are not getting enough cooling water flow at low revs. I can think of 2 reasons this might happen.

Firstly, your water pump or impeller may be defective and not pumping effectively. However, you have recently changed the impeller and cleaned the pump so maybe this is not the problem.

Alternatively, you may have a small air leak in the sea water intake circuit before the pump i.e on the suction side. The most likely cause of this is a poor seal on the lid of the sea water strainer. If air is entering here the suction is reduced and hence the flow of cooling water is also reduced. I had this problem on a previous boat and finally replaced the poor Volvo strainer with a better designed system from Vetus. 

Air leak might be a cause...

If moving the expansion tank I will look in to that as the next step.

But Perttu`s comment makes me think I am on the right track.
Under sail, my overheating experience is on the port side tack...

Cheers


Edited by Fiona - 08 January 2016 at 08:21
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Sea-U View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sea-U Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2016 at 10:41
I had a Volvo 2002 for many years. Had much problem with growing inside in the saildrive.
When I changed the rubber seals I cleaned of caurse. Then the problem was gone for a few years.
The last season I had it, I disconnected the hose and connected it to a washbasin outlet.
I could then run full revs with no problem.
Sea-U is a 370e #532 located SW Norway
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Nilandhoo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nilandhoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2016 at 12:23
Hi Magnus,

We have a D1 30 on our 325 and the Volvo maintenance manual recommended cleaning the heat exchanger last year.  We spoke to the local Volvo engineer who advised us not to dismantle the unit but to use RydLyme.  This stuff descales the system and cleans out the heat exchanger.  This may be worth trying if you are having overheating problems at low revs.

http://www.rydlyme.co.uk/index.php/en/

Regards

Paul
Hanse 325 'One Life'
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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 12:41
Originally posted by Nilandhoo Nilandhoo wrote:

Hi Magnus,

We have a D1 30 on our 325 and the Volvo maintenance manual recommended cleaning the heat exchanger last year.  We spoke to the local Volvo engineer who advised us not to dismantle the unit but to use RydLyme.  This stuff descales the system and cleans out the heat exchanger.  This may be worth trying if you are having overheating problems at low revs.

http://www.rydlyme.co.uk/index.php/en/

Regards

Paul

Thanks for the tip.

Even though I donīt think the problem is on the sea water side (I am in the Baltic sea, more or less fresh water) It could be worth to rinse the heat exchanger. How do you use this product?

Cheers!
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Nilandhoo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nilandhoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2016 at 13:02
Magnus,

From memory you need to dilute it and pour it into the strainer then run the engine and leave it for 24 hours before flushing the system through.  I think there are instructions on the container but if not let me know and I will check next time I'm down at the boat.

Cheers

Paul
Hanse 325 'One Life'
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