Changing A Raw Water Impeller (How To) - Page 4 - SailNet Community
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post #31 of 43 Old 07-31-2008
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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.

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post #32 of 43 Old 08-01-2008 Thread Starter
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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..

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post #33 of 43 Old 08-01-2008
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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!

Jim

Last edited by SEMIJim; 08-01-2008 at 08:15 AM.
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post #34 of 43 Old 08-01-2008
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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
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post #35 of 43 Old 08-01-2008
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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.

Jim
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post #36 of 43 Old 04-29-2014
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Re: Changing A Raw Water Impeller (How To)

yanmar 4jh dte with litte acces - how to?
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post #37 of 43 Old 04-29-2014
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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.

http://www.autozone.com/autozone/acc...uestid=8039288

I use it for my turn buckles as well.
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post #38 of 43 Old 10-29-2014
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Re: Changing A Raw Water Impeller (How To)

This thread is a bit old but I'm hoping halekai36 or someone else can help - specifically with changing my impeller.

Fyi, I'm a new Ericson 30+ owner doing my maintenance for the first time. With a boat buddy, I managed to change my oil and oil filter, transmission fluid, both fuel filters and bled the system. All seems good! :-) I decided to wait on changing on the coolant until I figure a couple things out.

HERE'S MY BIG QUESTION:
I'm trying to change the impeller on my raw water pump. I have an Oberdorfer (p/n # N202M-07) raw water pump. Per the engines owner's manual, I removed the screws, front plate and the retaining ring. Using a wooden dowel to keep the shaft from coming out I was able to pull out the impeller (that took quite a lot of work). I took the impeller to the chandlery and got a new one. Pushed the new one onto the shaft and it seemed to go all the way on but there's just not enough clearance to get the retaining ring back into its little groove. Any ideas?

Yes, we compared the new impeller to the old one. It sure seems like its definitely the right replacement part (and went to a good chandlery that should definitely know). It seems like the new rubber is slightly firmer as would be expected, which makes it stick out maybe less than a millimeter more - just enough that we can't get the retaining ring back on.

Would really appreciate any help!
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post #39 of 43 Old 10-29-2014
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Re: Changing A Raw Water Impeller (How To)

Look at your "oil change" thread... I believe that I gave you the answer there.


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post #40 of 43 Old 10-29-2014
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Re: Changing A Raw Water Impeller (How To)

Quote:
Originally Posted by ferg View Post
yanmar 4jh dte with litte acces - how to?
I have the same engine...I find it easier to remove the whole pump and replace the impeller working on the worktop in the galley...

My wife loves me doing it that way! But it only takes 20 minutes!

Phil
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