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Old 03-21-2017, 03:58 PM   #21
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I do as you suggest, on spares. When I am going to install a new item, such as an impeller or filter, I order a new one to go into the spares locker then use the new one that has been in the spares locker.

(If only I had a spares locker. I have a plastic tub with a lid that sits in the lazaret underneath the aft cockpit.)
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Old 03-21-2017, 04:11 PM   #22
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I change mine every other season. I use the spare then I buy a new spare. I don't save used impellers.
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Old 03-21-2017, 04:31 PM   #23
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Yanmar impellers seem to hold up well. If you change them once a year and they always look good, can probably go two years. Or more. Changed several that were at least five years old and they looked good.

Some Detroits with Jabsco's last very long. Changed several that were like ten years old and they looked great!! In fact, I can't remember ever changing a shredded impeller on a Detroit/Jabsco. Except for a few run with sea cocks closed.

My Cummins with Sherwood pump is an impeller eater. I only get about 250hrs before a zinc change reveals impeller blades. Fortunately the are easy to fish out. I don't change on schedule usually, but before any long trip. It fortunately has never failed to pump.

Wish Cummins would use Jabsco pumps...
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Old 03-21-2017, 06:15 PM   #24
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Good to know Ski, I will keep an eye on that. As I said, when I pulled the impeller last year it looked great but I replaced it anyway since it was a number of years old.
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Old 03-21-2017, 07:48 PM   #25
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My port engine impeller is fairly easy to change once I modified the impeller puller. The original T handle would not make a revolution due to hitting the oil dipstick. I bought some all thread (metric of course) and put double nuts on it and use it instead of the T handle to drive the old impeller out of the housing. The starboard engine impeller is a living bugger to get to. I bought an aluminum insertion tool that should help, will be trying to replace the impeller in the next week or so. I also am going to install my new Speedseals on both pumps. These have knurled thumb screws that can be removed without any tools. The Speedseal covers use an O ring instead of a paper gasket so you don't have to clean off the old gasket from the face of the pump each time.

I am going to change the impellers each year since I don't want to have to change them in an emergency situation.
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Old 03-21-2017, 08:46 PM   #26
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I considered the Speedseal kit, but didn't pull the trigger for some reason. Any bad experiences with Speedseal?
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Old 03-21-2017, 09:47 PM   #27
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I've been tempted by the Speedseal kits as well. It certainly seems like it would help to reduce the number of bolts/washers/tools dropped into the bilge.


In regard to the lifespan of impellers... I would say this is inversely proportional to the length of time the engine has been run with the raw water seacock closed.
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Old 03-21-2017, 10:01 PM   #28
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Doug,
You're new here, so I'm going to say this nicely, thow your f*cking used spare parts away! Buy new spares like belts, hoses, and impellers. When it's time to replace the item in service, use your spare and buy a new one for your spares. You're rotating out your spares, so what you have as a spare is unused and not that old. Think about it, if you have to change a failed impeller while out cruising with an old used spare, you'll just have to change it again later because it's old and used.

Welcome to the forum! Sorry for jumping on you. You just touched one of my biggest pet peeves.

Ted
GREAT advice. New spares is the cheapest insurance on the planet.

My $.02.
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Old 03-22-2017, 08:08 AM   #29
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Ted

Your smarter than you look. LOL. Great advice as usual.
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Old 03-22-2017, 08:22 AM   #30
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...In regard to the lifespan of impellers... I would say this is inversely proportional to the length of time the engine has been run with the raw water seacock closed.
Yup. Did that just a few weeks ago on the generator. Putting in the new impeller was the easy part. Chasing the pieces, that took the time.
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Old 03-22-2017, 09:11 AM   #31
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Concerning pieces of rubber, I often wondered why no one has come up with a faulty large opening screen (perhaps 1/4 inch) totrap the pieces before the heat exchanger.
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Old 03-22-2017, 10:17 AM   #32
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Doing it at the dock is easy. Doing it in a crisis on the water isn't. Plus, it's nice being able to stop for a beer break when doing it at the dock.
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Old 03-22-2017, 10:17 AM   #33
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Ted

Your smarter than you look. LOL. Great advice as usual.
Something we have in common.

Quote:
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Concerning pieces of rubber, I often wondered why no one has come up with a faulty large opening screen (perhaps 1/4 inch) totrap the pieces before the heat exchanger.
I always assumed the heat exchanger had 1/4" ID tubes to act as a strainer.

Ted
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Old 03-22-2017, 11:35 AM   #34
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Bigfish....I am worried because Ted looks way smarter than me.

I have seen a suggestion where a union type joint with a screen in it....Either homemade or common with boiler systems between your pump and heat exchanger simplifies an Impeller coming apart.

Guess I have been lucky all these miles and years....haven't had an issue yet.
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Old 03-22-2017, 11:48 AM   #35
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I considered the Speedseal kit, but didn't pull the trigger for some reason. Any bad experiences with Speedseal?

I have the Speedseals on my engines. I think they're good and they certainly do make R & R easier and quicker.

Ken
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Old 03-22-2017, 12:29 PM   #36
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I ordered the kit. That will make me change my impeller. Lol.
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Old 03-22-2017, 02:27 PM   #37
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I've been tempted by the Speedseal kits as well. It certainly seems like it would help to reduce the number of bolts/washers/tools dropped into the bilge.
We just received our new Speed Seal kits and will be installing them and making a video. I've always wondered about them, and it wasn't until I broke a couple of those little screw heads off trying to remove the cover that I finally decided to "upgrade".
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Old 03-22-2017, 03:03 PM   #38
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Scott

Most look smarter than you and all look smarter than me. LOL

Ted you are of course correct but that requires you remove the end cap of the heat exchanger. I'm looking for something more simple. What Scott has seen might be the ticket.
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Old 03-22-2017, 03:48 PM   #39
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We just received our new Speed Seal kits and will be installing them and making a video. I've always wondered about them, and it wasn't until I broke a couple of those little screw heads off trying to remove the cover that I finally decided to "upgrade".
I look forward to seeing the video. The Speedseal kits got rave reviews by Catalina 400 owners with the older Westerbeek engine. The pump was almost impossible to reach and it couldn't be seen. The kits were great them them. On my Catalina, the pump was right in front and easy to reach. On my current Cummins it is also easy to access so no need.
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Old 03-22-2017, 03:59 PM   #40
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Scott

Most look smarter than you and all look smarter than me. LOL

Ted you are of course correct but that requires you remove the end cap of the heat exchanger. I'm looking for something more simple. What Scott has seen might be the ticket.
Part of the reason I change the impeller is because I still have a Cummins in my charter boat. When the impeller looses a blade, it goes into the transmission cooler. No end cap to remove on the transmission cooler. Like picking cotton out of an aspirin bottle, standing on your head, with the lights out.

Ted
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