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Engine alarm issue

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marisco View Drop Down
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Post Options Post Options   Quote marisco Quote  Post ReplyReply Direct Link To This Post Topic: Engine alarm issue
    Posted: 22 May 2016 at 5:22pm
I'm getting an alarm problem...

About 10-30 seconds after starting engine the overheating alarm sounds - not normal volume but fairly quiet - you need to put your ear close to the panel.  Also the blue overheating light doesn't come one.  It's like it's doing a half hearted effort.

The engineer thinks the engine temperature is fine.  He has tried 2 sensors.  When he shorts the alarm circuit manually the overheating alarm sounds loudly and the blue light comes on - as expected.

Wondered if any advice on what the problem might be or what I should try next ?

BUKH DV20 1977 I think..

many thanks,

Paul
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Galatea View Drop Down
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Post Options Post Options   Quote Galatea Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2016 at 1:11am
I assume your engine is raw water cooled?  The VDO temperature alarm sensor tends to corrode, let salt water inside, and fail.  I think VDO might have made it especially for Bukh.  Many years ago they replaced mine under warranty, but the replacement also failed.  Seems like a bad design.
Mark
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marisco View Drop Down
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Post Options Post Options   Quote marisco Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2016 at 6:22pm
Yes raw water cooled.  Maybe I need to try another sensor !  paul
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Galatea View Drop Down
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Post Options Post Options   Quote Galatea Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2016 at 12:31am
See if you can find one that matches the thread.  I couldn't and ended up sealing the broken sensor with epoxy and learning to live without temp alarm.
Mark
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Keny View Drop Down
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Post Options Post Options   Quote Keny Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2016 at 6:55pm
Hello Paul
Welcome to boating. Are you sure that the audible alarm is only for overheating? Usually it sounds 
for other things as well.
keny


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Post Options Post Options   Quote marisco Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2016 at 8:15pm
I think so, but not totally sure..
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Keny View Drop Down
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Post Options Post Options   Quote Keny Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2016 at 9:09am
Do you have warning lights for oil pressure and battery charging? 
Are they bulbs or led's?
If they are all connected to the audible alarm they all need isolating to find the fault including the alternator.
keny


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Post Options Post Options   Quote Keny Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2016 at 8:46am
Just had a thought that the two wires on the sensor may be crossed over - this would have this effect but of course your temp. gauge would't work.
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marisco View Drop Down
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Post Options Post Options   Quote marisco Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2016 at 9:36pm
Update - all sorted !  Excellent engineer from Lymington installed new sensor (the previous one faulty and wired incorrectly !)
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2016 at 9:45pm
Great, I'm pleased it's all sorted :-)
George Isted
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