Tohatsu 18hp 2stroke - impeller change - HELP

[SiClapham]

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

[millplus]

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

IMG 1108 - YouTube

[Locozodiac]

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

[SiClapham]

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

[Locozodiac]

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.

Happy Boating

[SiClapham]

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