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Old 27 October 2013, 09:51   #1
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Country: UK - Wales
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Boat name: Dian
Make: Zodiac mkII classic
Length: 4m +
Engine: Tohatsu 18
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Tohatsu 18hp 2stroke - impeller change - HELP

Howdy all
We've just changed the impeller on the above outboard, first time at giving it a go
Everything we thought went back together as it came off......impeller fins bending the same way as the one that came out, little wedge/key in place on the drive shaft......little problem with the wedge not sitting correctly as the housing was sat over - but the bolts gently pulled it all up snug.

Topped up with oil, in the water bin and started......but no water squirting from the jet

Help please
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Old 27 October 2013, 10:57   #2
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Take the leg off again and try it in a buck of water , drive it with a cordless drill
If its ok it should pump a spout of water up if that happens its ok
So you must have missed the pipe that goes into the top of the pump when you put it back together


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Old 28 October 2013, 13:53   #3
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Boat name: Nautile
Make: Sea Rider Boats
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Engine: Tohatsu 18 /30 HP
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5 Possible causes to check :

1-Impeller key is missing, fell while housing was being seated.
2-Impeller was rotaed CCW and not CW when seating housing.
3-Impeller is not original or not suitable for that model engine.
4-Missed the connection between water pipe and pump's upper rubber grommet while assembling back.
5-Pee hole is completely clogged, run a wire or narrow plastic tie wrap back and forth several times to free clog while engine is running.

Happy Boating
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Old 29 October 2013, 03:15   #4
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Country: UK - Wales
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Cheers guys
The impeller had the right part number on the packing; fingers crossed there.
Rotated CW
Pee hole was clear last time the engine was fired up; 2wks ago

So, we did have an issue with the key - probable cause and will drop the lower half on Saturday and re-check. The water pipe hopefully connected on the rebuild; but will use the Drill tip, cheers millplus, to check the impeller works first.

fingers crossed
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Old 29 October 2013, 20:51   #5
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When placing key on shaft and after impeller is well bottom seated, lightly rotate impeller back and forth with fingers to check key is stopping impeller on shaft. Apply a light coat of vaseline, love lub, soappy water to liner, while rotating impeller CW push housing down. If all parts are well assembled should work well with drill.

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Old 04 November 2013, 05:12   #6
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Country: UK - Wales
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Stripped the lower leg off to reveal a knackered impeller Obviously the fitment last time didn't go to plan
New impeller fitted (much better fit on the key this time)....and pumping like a full bladder

Note - impeller this time around came out of a genuine tohatsu sealed packet, whereas last time (different supplier) it came out of a plain packet with the part number stuck on it.
Ferrule of the genuine impeller was plastic; ferrule of the 'other' one was steel
Maybe one shop was selling non-genuine parts?

All good now though and thanks for the advice
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