Yanmar Impellers

gjeffery

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Please can anyone tell me if I should change the impeller of my 1GM annually, or after every so many hours run?

Do impellers deteriorate according to engine hours run, or according to time fitted, especially during the lay-up, when one side of the impeller is constantly distorted?

As a rider, I was somewhat surprised to be quoted £17.50 + vat as the price for a new impeller. I don't want to over maintain, and I will certainly look at the prices in Cherbourg!
 

ditchcrawler

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I always changed mine every year for peace of mind.You can take it out over the winter if out of the water of course.Keep last years as a spare.It depends how you view money/maintenance/safety.You might go two or three years with the same impeller & no problem.Then again it might disintegrate when you are crossing a ship lane or entering a marina.
 

ShipsWoofy

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Paid a little over a tenna for my jabsco impellers for my 1GM10.

I replace mine when they go, but I have twin motors so simple enough to shut one down if one fails. You will have to make this call.

If I was running a single and laid up over winter I would remove the impeller and inspect, fitting it again at launch time. I would not change it every year as see that as waste personally.

The biggest failures are the centre lug becoming detached from the rubber, this causes it to spin merrily without the blades turning at all. If this happens and you do not have a spare, it is accepted as a jury to drill into the lug and using one or two tiny self tappers to hold the rubber in place.

Though it is prudent to carry a spare, the last time I changed one it took about 10 minutes /forums/images/graemlins/grin.gif
 

Birdseye

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Never bothered changing it in 7 years never mind one. Mind you I did carry a spare second pump - you try faffing around with those tiny little bolts, pump in situ, boat bouncing about.

So my approach was to buy a second pump and recover the cost by not bothering to change the impellor
 

fireball

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Ours failed in the 2GM20 ... but we didn't notice until we came to run fresh water through - it wouldn't draw any out of the bucket ... obviously when still in the water there was sufficient head of water to keep the water flowing through the engine...
 

Colvic Watson

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When you take it out at lay-up time, put it in a plastic bag with a drop or two of water, they hate drying out once they've been used. Should be fine at the start of the season.
 

cindersailor

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Being a complete cheapskate I have experimented with glueing impellers that have separated from the bronze/brass (?) centre bush. It goes against the grain to throw away something that should be reliably fixable.

Early attempts were a failure, but I now find that if you carefully clean/roughen the surfaces to be glued and then soak them in acetone for a few hours to degrease, the joint is much stronger. I have used normal Araldite which is a 2-part epoxy. They are glued in the first place after all so there is nothing wrong with the principle (if you ignore the fact that they failed in the first place!), its just a case of finding the right glue and how to make the bond. The rubber of the impeller swells up quite a bit in the acetone, but if you then let it dry out over night it shrinks back to its original size with no apparent ill effects.

Only been in use since the start of the season, but no problems so far. Always carry a spare new one of course just in case, and will probably go back to a genuine new one once I am satisfied that my glued ones are a reliable back up. The unreasonable price of Yanmar spares force such ingenuity on those without deep pockets!
 

R32Stbrigid

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The time between routine replacements various with engine hours and water cleanliness. I change mine about every 700 - 800 hours. ASAP supplies - web page will supply some run dry impellers for Yanmars.
 

Benbow

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I used to change mine every year. Then I had a whole series of failures in brand new ones. Fortunately I had lots of spares - I had 3 fail in rapid sucession in very difficult conditions and was feeling distinctly seasick by the time I had swapped the last one.

As a result, I was extremely reluctant to change out one that had worked for a season, so I now inspect and leave. If you do change one I STRONGLY advise you not to discard but to keep it as a spare.
 

Robin

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I have always fitted a new one each year and kept the old one as a spare on the grounds that the extra cost was a worthwhile insurance, but having just been charged £42 for one for my Yanmar 4JHE may change the policy, especially as I now have a collection of part used apparently perfect ones! The same impellor in France is listed in the USHIP 2004 catalogue at 14.80 euros, call it £10 and the one for your 1GM is 10.80 euros (catalogue number 26809). Uship don't have a place in Cherbourg but 15.07.01285 is the cat number at Big Ship who do have a shop in Cherbourg marina but Big Ship don't show a price in their catalogue. I will certainly be stocking up for ours in France.
 
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