Detroit Engine Impellers

im not sure of the part nubmer but I recently paid around $180 from JnT for a 671 TIB impeller.

Hi,

If you know the Jabsco number these guys have a cross reference or you can supply some engine data and see what they offer.

Jabsco, Impeller, Silhouette Q, 3-3/4" Diameter, 12 Blade

Lou, the Jabsco part number is 17936-0001-P Profile Q
DDA PN#5196168 PN#5198550

Hi,

That looks like the one I pasted the link to.

While reading this a thought came to mind. I keep spares on board as do most of you.
What is the shelf life of a spare rubber impeller?

that is a good question, but i rotate my spare impellers.
so every year i replace the impeller with the spare impeller, i then buy a new spare.

I like to have enough spare impellers, belts, hoses and fluids onboard to swap out any unexpected failure.

As do I, however, those of us who boat on the Great Lakes as an example have relatively short seasons( and therefore lower annual hours of use). So if the service life of an impeller is X and average hrs/yr is (say) 70. We can easily go numerous years on an impeller.
This is allowing for regular inspections.
Would anyone have an opinion as to how many years of service to expect under these conditions in 671's

We have talked about impeller life before. Yes, some people have got 4 or 5 years of service and saved a few dollars.
We did not hear much from people that tried to last 4 years and blew up the motor along the way.

Look at it this way; The raw water pump for your marine engine is the heart of it's life. When it suddenly fails, your engine suddenly fails. Throw Murphy's law in there some where and you could have a disaster any day.
It's cheap insurance to install a new impeller every year (or two), Check/replace drive belts, check zincs, check clamps & grease cups. Keep the removed ones for temp spares, shop for new inventory (brand New Impellers & belts) And go boating with the confidence of something less to worry about.

It's 2 years or 200 hours on most impellors. I'd recommend changing them on the mains before Season 1, using it for Season 1+2, then changing it right before season 3. Unless it's a $30 sub 30KW generator impellor, I'd change those annually, and it's a 30 minute job to change most of those, and they're recommended to change every 100 hours. Not using an impellor is just as bad as the blades take a set to wherever they are sitting in the pump. You know, the old saying goes, if you have to ask, you might as well change it......I agree with Rcrapps on this.

Unless you're talking about the really large impellors for like a 12 cyl Cat or Man, those they say are 500 hours as recommended by the engine manufacturer BUT the impellor manufacturer still recommends 200 hours, but I still recommend changing them sooner than 500 hours and at 200-300hrs because I've seen several that were pretty deteriorated and missing a vane etc at or just before the 500 hour mark.

We run 12v71s with 3.5 inch pumps. In Jacksonville Florida, We operate in a silt, sand, junk environment. They get service every year.
Have you priced out replacing a 6/71 lately vs. the cost of water pump service?