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Old 19 June 2013, 16:30   #11
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Un be fookin leivable ?
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Old 19 June 2013, 18:06   #12
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Un be fookin leivable ?
Figured the OP had no idea what you were fookin takin aboot
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Old 21 June 2013, 10:02   #13
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Bigmuz; if you described it as a "Woodruff Key", it might have been clearer. It sounded like you were talking about the housing spinning (though I can't see that happening.)

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Old 21 June 2013, 11:25   #14
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Bigmuz; if you described it as a "Woodruff Key", it might have been clearer. It sounded like you were talking about the housing spinning (though I can't see that happening.)

jky

He was. there's a stainless insert in most housings that the impeller sits in. It can spin if the locating 'lug' is broken off.

See pic below.

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Old 21 June 2013, 17:06   #15
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Yamaha impeller problem

Thanks to everyone for all your suggestions, I'm gradually working my way through a process of elimination. Have installed a new thermostat, have taken off the exhaust housing cover and removed as much grit, dirt and grime as I could. The only thing I haven't done at the moment is replaced the impeller, due to the fact I was sent the wrong one and it was loose on the shaft, unlike the original one which was still tight and did work...well to start with anyway, till I started picking up the revs and it started getting warmed up, so still not sure as yet if it's an impeller problem, but going to replace that with the correct one anyway. Did consider that it might be the impeller housing slip in, but everything seems to be ok there and woodruff key in place, also thinking about flushing the system out with a descaller. still not thinking about going in to the head just yet but if I have to I will, have included some pics,original impeller closest in pics. .
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Old 21 June 2013, 17:25   #16
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Is the top one the old impeller? Is that a brass insert I can see?
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Old 21 June 2013, 17:28   #17
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Your old impeller does look a little worn at the end of the blades.


When we rebuilt the Yam 75 we replaced the impeller as the tell tale wasn't great, it made NO difference. Suspecting a blockage I took the gearbox off and put the garden hose on the water pick up pipe and turned it on to see if there was restricted flow, there wasn't. It had to be something to do with the pump.

I noticed the stainless cup had some slight grooving in it so I ordered and fitted a new one.......job sorted!

The tell tale would almost drill glass now, even at idle.
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Old 21 June 2013, 17:34   #18
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no the bottom one is the old one, and yes I think the new one has a brass lining.
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Old 21 June 2013, 17:38   #19
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no the bottom one is the old one.
Ah well, that's my "worn looking impeller" theory out the window!
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Old 21 June 2013, 17:39   #20
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But why would it go from a good jet on start up, to water getting very hot and stopping altogether.
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