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06 August 2014, 15:06
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#1
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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06 August 2014, 15:08
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#2
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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2 more pics showing score rings
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06 August 2014, 17:00
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#3
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Member
Country: UK - England
Town: teesside
Boat name: magic
Make: humber 5.5
Length: 5m +
Engine: mariner 115
MMSI: 232012453
Join Date: Apr 2014
Posts: 1,558
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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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06 August 2014, 17:07
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#4
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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06 August 2014, 18:15
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#5
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,919
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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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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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06 August 2014, 18:25
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#6
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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06 August 2014, 18:28
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#7
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,919
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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.
__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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07 August 2014, 08:04
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#8
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Member
Country: USA
Town: NorCal
Boat name: SHARKY
Make: AB
Length: 4m +
Engine: Honda BF75 & BF5
Join Date: Dec 2009
Posts: 2,108
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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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07 August 2014, 09:04
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#9
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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07 August 2014, 16:24
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#11
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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07 August 2014, 16:27
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#12
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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07 August 2014, 16:34
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#13
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,919
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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
__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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07 August 2014, 17:43
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#14
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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Cheers Alan just emailed him
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07 August 2014, 19:02
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#15
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Member
Country: UK - England
Town: Sticks, N.Yorks
Boat name: Tamanco
Make: Honwave 3.5AE
Length: 3m +
Engine: Tohatsu Outboard
Join Date: May 2012
Posts: 1,176
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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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07 August 2014, 20:21
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#16
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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13 August 2014, 17:14
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#17
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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13 August 2014, 17:21
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#18
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Member
Country: UK - England
Town: Sticks, N.Yorks
Boat name: Tamanco
Make: Honwave 3.5AE
Length: 3m +
Engine: Tohatsu Outboard
Join Date: May 2012
Posts: 1,176
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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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13 August 2014, 17:23
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#19
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Member
Country: UK - England
Town: Sticks, N.Yorks
Boat name: Tamanco
Make: Honwave 3.5AE
Length: 3m +
Engine: Tohatsu Outboard
Join Date: May 2012
Posts: 1,176
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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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13 August 2014, 17:37
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#20
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Member
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
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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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