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Old 20 September 2014, 11:51   #1
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engine

Hello
Can someone help
I have recently started boating again and bought a 15 hp mariner 2 two stroke approx late eighties model as usual the seller promised me it was sound and like a fool i travelled 280 miles round trip for it anyhow i took it on the river to try it out and it started an ran great then it stopped pumping water after i had put it on full throttle for about five minutes so i turned it off and rowed back when i got home i checked the impeller and it looked ok but changed it anyway i also took the thermostat out and put it in boiling water and that opened up.
I have not tried it since but wondering if it could be anything else before i take it out again.
Any advice much appreciated.
John
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Old 20 September 2014, 12:05   #2
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I have a 2005 Mercury 15hp 2 stroke and was warned to expect sporadic flow from the tell tail. Something to do with the design of the thermostat and not having a bypass like a poppet valve. I can't say for certain that your year model is the same but I've had no issues with mine!
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Old 20 September 2014, 12:09   #3
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Cheers mike if i understand you right do you mean you keep going even if the water is not pumping out
John
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Old 20 September 2014, 12:32   #4
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Try a search on here, some of the identical Mercury engines only have intermittent cooling when needed.
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Old 20 September 2014, 13:03   #5
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My experience of the Mariner 15 was that the intermittent flow was only at idle and the slowest trolling speed... once delivering power it was a constant jet.
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Old 21 September 2014, 02:22   #6
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Have you checked that the telltale outlet isn't blocked? That can sometimes give the illusion that there's a cooling water problem.

Did the block show any signs of overheating? If you've got a total cooling failure your engine will get very hot very quickly!
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Old 21 September 2014, 03:24   #7
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If you have put the thermostat in boiling water it is now what we called buggered, you need to replace it.
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Old 23 September 2014, 13:49   #8
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It stopped pumping water at full throttle i have checked and all the system is clear and the impeller was ok but i have still changed it i must ask the question as to why the thermostat will be buggered do to being put in boiling water cus i was told to do this by a boat dealer.
cheers
john
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Old 23 September 2014, 14:25   #9
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Have you tried attatching a hosepipe to the pipe that runs from the impeller up to the powerhead without the thermostat fitted to see if the water circulates freely? Also that the impeller is rotating properly, some cheap models can spin on the brass centre. I've dipped mine into boiling water on a piece of string before with no apparent ill effects to check them.
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Old 24 September 2014, 04:46   #10
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Hi thanks i will try it without the thermostat i have also pur an air line on it and it was all clear.
I have read that not all engines have a thermostat does this mean it does not need one and can be run without.
Cheers
John
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