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Old 14 August 2004, 20:17   #11
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Finally, add water and enjoy.
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Old 15 August 2004, 05:55   #12
tue
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We always at least check the impeller every year when we do a service and generally unless the engine has done very few hours we change it. Alot of people forget about checking the wear plate or pump housing for scores and gooves, which can be as much of a problem as a worn out impeller.

Well done for remembering the bolt under the trim tab . You wouldn't believe how many people come in complaining because their gearbox is stuck on and no amount of hammering has freed it off .
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Old 15 August 2004, 06:11   #13
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Hi Paul,
Just wondered if the Yamaha water pump is better or worse than any other to service? I thought that it's really badly designed (from a service point of view) and if the Yamaha design engineer had been present I would have had some choice words for him!
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Old 15 August 2004, 06:52   #14
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They are all pretty much the same to work on. The main problems are the different types of gearbox mounting and shift shaft attachment which can be a real pain to re-align when re-building box to engine, especially the medium sized Jhonson/Evinrudes .

The Mercruiser Alpha 1 gen2 type water pump (also used in the Merc/Mariner engines) is a bit nicer to dissasemble/reassemble as the impeller fits into the housing alot easier and you don't have to struggle for ages trying to get all the bades in. Plus the impeller cup (where the impeller runs inside) is not separate from the housing and tends to last for ages without any sign of wear.
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Old 15 August 2004, 07:25   #15
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Big hand to you Richard, well done for sharing that with us.
Are you saying that your service did not include checking the impeller?
It dose seem to be very expensive for what you had done!
I have just changed the plugs, gear oil & new fuel filter!
Very little cost & time, it's good to get to know your engine for when it all goes pear shape!
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Old 15 August 2004, 07:40   #16
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Quote:
Originally Posted by Nick Hearne
Are you saying that your service did not include checking the impeller?
I asked the dealer if they would change the impeller during the service. They said: "We will inspect the impeller and if it is worn, we will replace it. We won't fit any unnecessary parts". I said to them "I'm quite happy to replace the impeller regardless of visual condition".

Engine service was 31-03-04 and first sign of a problem was 07-06-04.

Now having stripped the pump, I realise that to go through the process of stripping it and then not to replace the impeller is ridiculous - in fact the alloy and plastic washers can't be removed without at least some deformation, and more likely destruction. So I don't believe the impeller was actually checked at all.
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Old 15 August 2004, 14:25   #17
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Quote:
Originally Posted by tue
Alot of people forget about checking the wear plate or pump housing for scores and gooves, which can be as much of a problem as a worn out impeller.
Tue,

how can scores and groves in the impeller housing and lower plate effect the performance of the impeller?

Adam
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Old 15 August 2004, 14:42   #18
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Tue,

how can scores and groves in the impeller housing and lower plate effect the performance of the impeller?

Adam


The water pressure leaks around the side of the impeller vanes...... IE the impeller also seals on each side and not just the blade tips...... This type of ware can effect the pressure the most.
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Old 15 August 2004, 16:03   #19
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Thanks for sharing with us you maintenance procedures on changing one of the most critical items that can be acheived by a good DIYer. I will also attempt the replacement of my Yam impellor in the comming months!

What type of waterproof grease did you use on the splines of the drive shaft and gear selector? All the manual says is Yamaha grease A (water-resistance grease) pt. number 90890-69911. I'm too lazy to ask the local dealer and thought you might be able to let me know?
Andy
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Old 15 August 2004, 16:08   #20
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What type of waterproof grease did you use on the splines of the drive shaft and gear selector? All the manual says is Yamaha grease A (water-resistance grease) pt. number 90890-69911. I'm too lazy to ask the local dealer and thought you might be able to let me know?
Andy
Just Quicksilver stuff... I'll go have a look if I've left the tube in the garage! (or you could scan the barcode off the piccy!)
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