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Go Back   SailNet Community > On Board > Gear & Maintenance > Changing A Raw Water Impeller (How To)
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Thread: Changing A Raw Water Impeller (How To) Reply to Thread

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Topic Review (Newest First)
04-29-2014 07:54 PM
Re: Changing A Raw Water Impeller (How To)

I do all the same except use this brake lube for assembly. Works with rubber as well.

I use it for my turn buckles as well.
04-29-2014 03:08 PM
Re: Changing A Raw Water Impeller (How To)

yanmar 4jh dte with litte acces - how to?
08-01-2008 09:56 PM
SEMIJim Well, looks like I won't be obtaining a Johnson MC97 impeller for our engines Oberdorfer 202M-series pump. Johnson doesn't make one for that pump. Nor does Jabsco. The only impeller manufacturers that make impellers for our pump is Oberdorfer (Neoprene), Globe (out of the question), Barco (whomever that is--same p/n as Globe, so I suspect that's a re-badged Globe) and Sherwood (which I cannot confirm because their web site is basically utterly and completely worthless.)

So it looks like it's the Oberforfer impeller for us.

08-01-2008 08:03 PM
ancient mariner

haleki 36 that is a great w/p impeller photo ! i thought every one can use an aid to install the impeller. use a hose clamp and curve all the blades in the same direction as you tighten the clamp till they are small enough to enter the houslng. just be sure they are bent in the right direction when you push the impeller in. this makes the job easy. i am a retired diesel mechanic and use this method
08-01-2008 08:13 AM
SEMIJim Moyer Marine makes a replacement back plate for most Oberdorfer pumps on A4s that employs an o-ring and four captured knurled-head screws. The advantages are three-fold: No more having to replace the gasket, no more having to get a screw-driver on to the screws--possibly from an awkward angle/position, and no more dropping screws, etc. into the bilge .

Perhaps the Speed Seal cover offers some of the same advantages?

Thanks for the picture of the new impeller, Hal!

08-01-2008 07:12 AM
Maine Sail
Re: Speed Seal

Having had one on a boat that I owned, came with it, I can't understand why someone would pay good money for this.

It takes me all of about 30 seconds to remove all the screws and it took me the same amount of time to un-thread all the Speed Seal screws as they are the same thread pitch. I really did not realize much if any time savings with the Speed Seal..
07-31-2008 11:00 PM
sailingdog TDW-

The speedseal has slots for some of the screws IIRC, so you don't have to remove all the screws all the way to remove the seal plate.
07-31-2008 10:49 PM
Originally Posted by camaraderie View Post
Fuzzy...I think you are referring to
That's the thing. Looks to me as if the only change is using gnurled knob instead of slotted screws. Not a bad idea I must admit but hardly revolutionary.

Any thoughts ?
07-31-2008 10:44 PM
Maine Sail
Originally Posted by SEMIJim View Post

How can you tell if Johnson impellers are fabricated with their new MC97 compound?

Like this..

07-31-2008 10:32 PM
Originally Posted by halekai36 View Post
I got nowhere with Globe...
Yours would be the third incident I've read of where somebody had premature failure of a Globe RunDry [tm] impeller and got no satisfaction from Globe Composite Solutions, Ltd. That's enough for me. Any company can have product failures, but I expect vendors and manufacturers to stand by their products.

Originally Posted by halekai36 View Post
...and if I remember correctly it was a metal hub.
So much for that theory

Originally Posted by halekai36 View Post
My current thinking is that my Johnson impeller was an old one when I installed it. My baot came with two new spares but who knows how "old" they were.
I've had this happen before and never seen cracks so my only guess is that the impeller was many years old and the rubber was aging before I actually installed it?
That would certainly explain it!

Originally Posted by halekai36 View Post
After this incident I bought 3 new impellers all with the new MC97 compound and threw away my one year old used ones. At $16.00 for an impeller why risk it..
Indeed! I'll buy two and install one this season. Next season I'll install the other and order a new spare. Each season: Wash, rinse, repeat.

How can you tell if Johnson impellers are fabricated with their new MC97 compound?

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