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Old 02 June 2019, 12:30   #1
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Yanmar 6LP STZE

Great few days out on the Solent but I seem to be loosening coolant water
Rib not over heating, been to Cowes from Hythe & back twice now 38 knots
all the way back to Hythe I don't understand where I'm loosening the water.
Could it the inter cooler
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Old 02 June 2019, 13:46   #2
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Are you loosing Engine Coolant, or cooling seawater?
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Old 02 June 2019, 14:40   #3
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Intercooler is raw water cooled could be as simple as a radiator pressure cap or a weep on a hose. Or could be more sinister I think I'd start with a pressure tester on the cooling system and check for coolant in the bilge
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Old 03 June 2019, 03:33   #4
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Defiantly engine coolant.
I will see if I can borrow a pressure tester

Thanks
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Old 03 June 2019, 03:49   #5
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So it's coolant. Is it "vanishing" or pooling in the bilge? The more info you give the better info you will get back.
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Old 03 June 2019, 11:32   #6
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I can't see any coolant any where in the bilge & the exhaust is not steaming.
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Old 03 June 2019, 13:05   #7
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Probably losing it but if its only a small amount then it could be evaporating before it hits the bilge. First things Id check would be pressure cap seal then engine water pump weep hole underneath look for pink or blue stains depending on colour of coolant.
I Cooked one of my engines due to loosing water from a tiny crack in the exhaust manifold by the turbo. Like you I knew it was loosing a tiny amount of water every day.
I slowed down to pass another boat and as I powered up again the low water buzzer went off I checked the temp gauge and all was good so foolishly silenced the alarm and carried on thinking I've only got 2 miles to go, kept a close eye on the temp guage and it never went up but as I approached the mooring and backed off I got a huge cloud of steam out the back and I knew it was terminal. Turned off and moored on one engine, by the time I tied up the engine had hydrauliced and wouldn't turn.
The low level alarm goes off after very little water loss but it obviously doesnt take much water loss to cause a damaging overheat and the temp guage doesnt register an overheat from low water so you need to be very careful
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Old 05 June 2019, 04:02   #8
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That makes a lot sense Ken I to had a warning light come on with CW next to it we didn't know what it meant temp & oil pressure all look good so I switch it off & carried on I think I was very lucky not to have cooked mine.

CW obviously coolant water any way I now have a pressure tester so will let you know
the results.
Thanks
Phil.
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