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Old 20 July 2013, 10:32   #1
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
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Mercury or Mariner 15 2-stroke cooling water exits.

Been a funny 2 or 3yrs with almost no time for boating. Last time I started my Mariner 15 (2001 2-stroke) was a year ago and that was very briefly then it was a year before that it last did any real work.

So it started instantly and idled well in the tank but I'm looking at the cooling water exits and unsure about the water exiting either side around the area the leg bolts to gearbox. It's flowing from from original drillings in the castings not any corrosion or gasket failure.

The normal tell tale runs fine and is warm, the water from these exits is cold. Ashamed that the near 2yr layoff has clouded my memory so much!

Images attached of the outboard so you know which one it is... and of the water stream exiting.

I have managed to find a youtube movie of the sasme outboard where it appears to show the same water flow but its mobile phone shaky footage and not 100% clear.

Off on boating hols in a week so need to sort if anything is wrong.
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Old 20 July 2013, 12:30   #2
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Country: UK - England
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Boat name: Bombard, Y-162
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Hi David, welcome back! . Note sure on the water flow but I'm sure Peter (b and o) will know. Not related to the intermittent thermostat flow on these Mariners?
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Old 20 July 2013, 13:49   #3
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I think you will find its the water thats draining out of the inside of the leg, if the tub was deeper you would not have noticed. The thermostat can take a while to open before you see a good flow from the telltale.
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Old 21 July 2013, 05:15   #4
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>>>I think you will find its the water thats draining out of the inside of the leg, if the tub was deeper you would not have noticed.

I'm thinking (hoping!) that's the case. You're right the actual telltale can look worrying at idle to those that haven't seen a thermostat fed one before. I put a new stat in 2yrs ago as part of its ten year birthday major service.

Hi Max I'll PM you a PM reply soon.
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Old 21 July 2013, 07:24   #5
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Country: UK - England
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David, I've been looking for a (side gear shift) 15 Mariner myself (and a Y Class still!) - posted a 'stat question here:

Mariner 15hp 2 stroke - removing stat/tell-tale
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