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Old 01-22-2013, 07:55 PM   #1
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Impellers

Yikes!
Was doing some routine maintenance today and pulled this raw water impeller off one of the engines. There was one piece of a blade that had broken off that I was able to recover. I donít know when the last time the PO changed it. The whole thing is pretty chewed up. KJ
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Old 01-22-2013, 07:57 PM   #2
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Ken, you got lucky!
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Old 01-22-2013, 08:11 PM   #3
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Yes I did. I'm taking the other one out tomorrow--very carefully. KJ
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Old 01-22-2013, 09:45 PM   #4
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Need to be proactively replaced on a regular schedule, per engine mfr spec. If the old ones look good, I keep them as a spare.
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Old 01-22-2013, 11:50 PM   #5
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Timely post. I just did my impellers today after 200 Hrs. They looked good with no cracks or missing pieces, but I tossed them. They tend to get a little torn up in the removal process.

My spare and a new one went in as replacements. A new one is sitting in the wings as a spare.
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Old 01-23-2013, 12:17 AM   #6
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KJ, Jabsco has two pages in their catalog that show pictures and give descriptions of various ways that impellers fail. Yours looks like their picture six.

Symptoms:
Blades Cracked about half way up their length
Some Blades Missing
Reduced Flow

Cause:
Normal End of Impeller Life
High Discharge Pressure

Remedy:
Replace Impeller, check for impeller pieces in discharge plumbing.
Reduce outlet restrictions or increase outlet plumbing diameter.

Sounds like your impeller died of natural causes. I doubt if it was the high discharge pressure problem.
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Old 01-23-2013, 01:06 AM   #7
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This was the impeller out of the fynspray raw water pump I removed when I was pulling the boat apart. I've since ordered two new impellers and fitted one. I'll replace the impeller during her annual haul out regime Depending on how much use the boat will get when I finish building her.

I have no idea when the PO last changed the impeller but obviously maintenance wasn't his strong point. Theres a fair bit of rubber missing so its a Good thing I had the heat exchangers and engine rebuilt ay!

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Old 01-23-2013, 01:16 AM   #8
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The Coot's engine valves are due for adjustment this year; intend to replace impeller at the same time.
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Old 01-23-2013, 06:58 AM   #9
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for those that winterize their boats...seem that no matter what the antifreeze guys say...it seems to shorten their lives...the other killer is leaving the impeller in the pump for a long layup

Everyone I know that takes their pumps home, pulls the impeller and let's it reshape gets 2-3 times longer use out of them. For smaller engines It's not a huge expense to change them as some manufacturers recommend every year if I recall, but it adds up on bigger engines.
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Old 01-23-2013, 08:02 AM   #10
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Just changed the impellers on both engines and the generator last week during annual maintenance. I use the spares bought last year, and replenish the stock of spares. Hours of use were fairly low, but time also kills impellers. By keeping 2 spares it gives redundancy when in the boondocks.
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Old 01-23-2013, 08:07 AM   #11
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Quote:
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...Just changed the impellers on both engines and the generator last week during annual maintenance.
We also change our impellers annually on our schedule.
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Old 01-23-2013, 08:09 AM   #12
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Greetings,
One of these years I'm going to order two (possibly another set for the Onan if available) sets of these. The "Easy Slider" covers, that is...Anybody use 'em?
Welcome to Speedseal
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Old 01-23-2013, 08:22 AM   #13
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I go 2 seasons on an impeller, leaving them in for winter layup. I throw the old ones away, and only keep new ones as spares, rotating them into sevice.
I have never pulled an impeller and found missing blades.
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Old 01-23-2013, 08:24 AM   #14
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In time ALL these rubber impellers will fail.

The simple solution is to accept that fact.

Cast Bronze In-Line Strainers from Sendure or any other mfg will catch ALL the pieces before they plug the block or heat exchanger

Seacock up to 1" .................................................. ............................. 0029S
Seacock 1 1/2

Better insurance than tow boat.
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Old 01-23-2013, 12:09 PM   #15
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Do y'all use a puller tool or just work it out with pliers and screwdrivers?
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Old 01-23-2013, 12:27 PM   #16
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Quote:
Originally Posted by RT Firefly View Post
Greetings,
One of these years I'm going to order two (possibly another set for the Onan if available) sets of these. The "Easy Slider" covers, that is...Anybody use 'em?
Welcome to Speedseal

I have installed a Speedseal. I am crazy about it.
So easy to check the impeller during normal maintenance. Two small knurled bolts to undo. No tools needed.

I highly recommend the Speedseal.

SD
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Old 01-23-2013, 01:15 PM   #17
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Quote:
Originally Posted by GonzoF1 View Post
Do y'all use a puller tool or just work it out with pliers and screwdrivers?
I would love to get a puller and just might soon...but been doing it for 30+ years with needlenose and screwdrivers....though not recommended...never had an issue that way 'cause I'm REAL careful....

Some would drive you nuts without a puller .....so depending is not a bad answer...

Some boats just pulling the pump is easier and working on a bench/flat surface makes it easy peezy...either way...
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Old 01-23-2013, 04:52 PM   #18
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If an impeller change is in your future, this thread. might be of use.
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Old 01-23-2013, 04:55 PM   #19
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Yup I've always done the deed w needlenose and SS screwdriver. Just a little bit of patience an out it comes. On a previous boat w a 120 Sabre the impeller came out w more than half the impellers gone and I had been running the boat (new to me) w no over heating.

Good point about leaving them all winter in one position. Mine was new when we left from Alaska but I'll change it in the spring. One nice thing about being hauled is that boat maintenance drops to almost zero.
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Old 01-23-2013, 07:48 PM   #20
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Years ago I bought a Jabsco puller it works really well! The impeller on my genset is in too tight a spot for the puller, for it I use a large, 90* bend, needlenose pliers that works very well.
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