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Old 14 August 2004, 19:31   #1
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Yamaha Impeller change

Who do you trust to service your outboard?

Like me, you may think that your dealer does a good job... I thought his 310 charge was OK for a service, but when you look at what's done: change 6x spark plugs, change gearbox oil, change a fuel filter, change all anodes and grease all points... that's a bit pricey... specially when one vital component is missed.

My problems started in May with intermittent overheat alarms. Once at about 42kts running through a rough sea, then this week at 38kts in calm water, then later the same day at 33kts in calm water. Each time the engine was fine after slowing down.

Knowing that no impeller had been itemised on the service bill, I decided to replace it before looking at any other source of the fault. And because this comes up quite often as a question, I kept a photographic record of the process...
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Old 14 August 2004, 19:35   #2
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1. Remove gearbox. There are seven bolts - six are obvious, but the seventh is hidden under the anode. So firstly remove the rubber plug from on top of the leg to reveal a hole into which a 12mm socket can be inserted (pic1). Then the hidden bolt is visible (red arrow in pic2). Once the gearbox is loose, disconnect the pitot tube (you'll need a friend or helper!) and place gearbox on your best kitchen chair!
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Old 14 August 2004, 19:38   #3
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Sad to hear about your impeller problem Richard, I agree with you it is worth changing it at least every other year especially if used in salty water even though you run it on fresh water when you take the boat out of water. I changed the impeller every other year. Our seas has quite high salt level.

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Old 14 August 2004, 19:45   #4
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Cheers Bogi.

I'm going to go on for a bit more about this...

OK, here's the labelled diagram!
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Old 14 August 2004, 19:50   #5
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Right then. Top tip - don't damage the input shaft!

The bit we're interested in is inside the pump housing, so undo the four bolts and lift it off. This will reveal the impeller housing which is held on with an alloy washer pressed over a plastic washer. These need to be removed, and they're a pig. I used a hacksaw and cut the alloy washer off very carefully. The plastic one can then be removed, and then the thrust washers (2x flat and 1x sprung). This leaves the impeller housing free to be slid up the input shaft. Take v. careful note of the order in which things come off!

Pic 1 shows the alloy and plastic washers.
Pic 2 shows all the components removed.
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Old 14 August 2004, 19:57   #6
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Time to inspect the old components... what a sorry story!
Pic 1: The impeller base plate is scored and so won't make a watertight seal
Pic 2: The old impeller in it's housing looks innocent enough until removed...
Pic 3: Big crack in old impeller
Pic 4: Crack on other side
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Old 14 August 2004, 20:03   #7
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Some good advive i got from the dealer was to buy a "pump kit", not just an impeller. This included a new impeller, impeller housing, base plate, pump base plate, pump housing inner and outer o-rings, plastic washer and alloy washer. I needed these. It also included a full set of bolts and a base gasket. I didn't need these. The kit cost 95 and the impeller only was 22. Hmmm.....

Anyway, next job was to fit the new impeller into the new impeller housing.

What a struggle. Top tip - delegete this job! Oh yeah, and make sure that the impeller keyway is the right way up, and the impeller blades "bend" the right way.
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Old 14 August 2004, 20:09   #8
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Once the impeller is in its housing, the next job is to re-assemble the pump. This bit was so awkward that there won't be any photos, sorry! We fitted the impeller and housing over the input shaft, fitted the thrust washers and a new plastic and alloy retaining washer, then had to hold the gearbox upside down so that the pump housing could be slid up to the input shaft and offered up to the impeller housing without dropping the o-rings from inside it. Once assembled, get the bolts in place, and now hold the gearbox the correct way up and torque the bolts.
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Old 14 August 2004, 20:13   #9
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Ready to re-assemble now...
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Old 14 August 2004, 20:16   #10
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Smoke and mirrors again as we struggle to re-attach the pitot tube then fit a couple of bolts whilst holding the gearbox up to the engine.

Then, as if by magic, it's back together again. Pic shows fitting the "hidden" bolt before re-attaching the anode.
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