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Old 07 August 2014, 11:24   #11
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Thanks for that link Paintman, some good clear diagrams on here !

Still unable to identify the year or model but think I've eventually found a part number for the impeller kit : 47-42038 Q3 - from a company called Repower Marine.

This one looks identical to the one fitted so I will order that.

All I now need is a part number for the thermostat, but they don't stock them, any ideas guys ??

Where is best to buy parts here in UK ?
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Old 07 August 2014, 11:27   #12
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Should I fit a thermostat ( as the engine was designed to have ) OR should I fit a restrictor on the tell tail as mentioned, so that the engine still gets a good amount of cooling but also so it will have water flow from the tail as a visual aid ?
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Old 07 August 2014, 11:34   #13
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Merc 15 2st Impeller Fitting

Stat.

Engines and oils are designed to work at a certain temperature.

For parts try Blackdog Marine, he's a member on here, he goes by the name of Turbodiesel. If he hasn't got it he'll find it
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Old 07 August 2014, 12:43   #14
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Cheers Alan just emailed him
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Old 07 August 2014, 14:02   #15
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Thumbs up for Black Dog Marine ! Excellent to deal with. Did you sort the mystery of the piece on the end of the pipe?

Fit a thermostat ! It's designed for one.
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Old 07 August 2014, 15:21   #16
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Hi Paddlers, yes managed to get it off the downpipe, took my time so as not to damage it and finally came off - I'll be sure and grease it for ease of removal next time.
It should have been inside the top of the impeller housing, bit strange why it wasn't, but I'm guessing that would explain the lack of water flow since it wouldn't have been sealed properly.

I'll fit a thermostat, will make it harder to check if the impeller is still working, but as you say it should have one so that's what I'll do.
Just checking prices here, those little stats are pretty expensive are they not !?
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Old 13 August 2014, 12:14   #17
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Hi guys, managed to fit the new impeller kit and the engine now pumps a good strong constant flow of water from the thermostat hole.

I then fitted a new thermostat kit ( with new O-ring and gasket ) however, the water now constantly flows from the tell tail - it does NOT stop and start.

Engine started from cold, it pumps within 2 seconds and continually did so for 10 mins on fast idle ( with prop in gear ).

Does this mean the new thermostat is faulty ? I inspected it and the thing looks to operate fine, the spring holds the valve closed unless pressed hard to open it.

Help !!??
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Old 13 August 2014, 12:21   #18
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You can check the thermostat by dropping it in boiling water in a piece of string. They operate at different temperatures which may be stamped on it!
The only accurate test is to have a thermometer in with it but you'll soon see if it opens or not !
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Old 13 August 2014, 12:23   #19
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On my bigger engine there's a spring valve that I can't remember the name of that allows water to pass when the thermostat's shut.....!
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Old 13 August 2014, 12:37   #20
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Hi Paddlers, I dunked it in boiling water before fitting just to see if it opens and closes which it did. The temp stamped on it is ' 120F '

Does your bigger engine constantly pump water or is it intermittent like this engine is supposed to be ?
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