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Old 06 August 2014, 10:06   #1
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Merc 15 2st Impeller Fitting

Hi guys, got a used Merc 15hp 2 stroke here and need to replace the impeller.

It would not pump any water out the tell tail ( only for 2 seconds at start up and then stop ) the inlet / outlet and hoses have been back flushed with a hose.

I then removed the impeller housing as shown

I'm unsure as to wether any gaskets or washers are missing so have taken photos of the removal, so that you guys can see and advise if any parts are missing etc.

There were no washers on the shaft or impeller.

I'm also unsure of how the water intake pipe connects to the impeller housing, does it simply sit on top of the housing or should it be inside before the casing is bolted down.. or .. ?

When the gearbox was removed, the rubber part was left attached to the main intake pipe up inside the leg

The base plate has some ring marks on it from the impeller ( see photos ), is this still ok to use or should it be replaced ?

1 last thing, how is best to remove this hard glaze stuff like varnish off the parts?
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Old 06 August 2014, 10:08   #2
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2 more pics showing score rings
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Old 06 August 2014, 12:00   #3
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these engines don't pump any water out of the tell tale until the thermostat opens a couple of mins after starting then it will stop straight away when the cold water gets to the stat then a min later will start pumping again .I also noticed when going slow on tickover the stat will close again and interrupt flow
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Old 06 August 2014, 12:07   #4
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Hi Beerbelly, there is no thermostat fitted at the minute, the previous owner must have removed it. But still there is no water flow..
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Old 06 August 2014, 13:15   #5
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Merc 15 2st Impeller Fitting

If it were mine it put in a full water pump kit, usually the kits contain the pump base plate, impeller and all gaskets required then I'd chuck in a stat with gasket, waz it back together and see what happens.

Good clean up job by the way.
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Old 06 August 2014, 13:25   #6
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Alan how does the downpipe connect to the impeller housing ? Does that rubber piece come off the pipe ?
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Old 06 August 2014, 13:28   #7
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Merc 15 2st Impeller Fitting

The part in picture 3 looks like it should be on the top of the pump, can it fit through the raised triangular part.
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Old 07 August 2014, 03:04   #8
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That impeller, although probably needing replacement, is fully functional. Good idea to inspect and replace it either way though.

When you flushed the block thru the thermostat, was it pumping water out the tell tale? Did you push water into the tell tale fitting?

I am still gonna go with an intermittent blockage.
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Old 07 August 2014, 04:04   #9
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Yes Alan, the rubber part eventually came off the downpipe and looks like it should be inside the top of the housing - it wasn't when I removed the box.

Peter, yes water flowed strong from the pick up and also the tell tail, flushed it both ways for 15 mins each.
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Old 07 August 2014, 04:47   #10
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Enter your engine details into this site & you'll get to exploded diagrams of the engine. Might help with what should go where.
Evinrude Parts - OMC - Mercury Outboard Parts - Mercruiser Parts - Yamaha Marine
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