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Old 28 March 2006, 13:12   #11
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,618
Originally Posted by BogMonster
Further on this I was talking to the guy whose marina I am using at the moment, and he tells me he has never changed the impellers on either of his RIB engines (two 75hp Mariners, IIRC) since he got them new in 1995, never had any problems.

So perhaps they last better than I thought!
The problem is not so much how long they last (which is, like any mechanical piece, variable), but rather what will happen when it fails.

Losing the impeller means no cooling to the motor. No cooling causes an overheat, which, if not shut down in time, causes oil to thin, and adjacent moving metal parts to come in contact with each other. This causes wear and breakage, not to mention stranding you on the water, usually at the worst of times.

So, you end up with a tow back to port ($500 to a couple of thousand), a motor repair bill (couple of thousand minimum, I'd expect), and a few weeks off the water. The $100 or so to replace the impeller is pretty cheap insurance, all things considered.


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Old 28 March 2006, 13:31   #12
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,655
Couldn't agree more jky - that is why I am going to do it anyway.

I am a great believer in prevention being better than cure - especially when the safety of my neck may also enter the equation!

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