SailNet Community - Reply to Topic
Thread: Changing A Raw Water Impeller (How To) Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
10-30-2014 12:52 PM
Re: Changing A Raw Water Impeller (How To)

Originally Posted by tdw View Post
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 ?
Went with speed seal, great piece of kit.
more than just knurled screws, the plate has a spinning teflon disc which prolongs impeller life and allows quick inspection without worrying about gasket issues.

Having had to replace impellers underway, much easier than using a blade screwdriver on screws while rolling around in a seaway.
10-29-2014 05:19 PM
Maine Sail
Re: Changing A Raw Water Impeller (How To)

Originally Posted by CS Cruiser View Post
When I store it away in a ziplock bag, whets the proper type of grease / lube safe for the impeller?
No grease but if you feel the need some 303 Aerospace Protectant is not a bad idea. Grease should not be used to lube impellers unless it is silicone based. The preferred lube for impellers is glycerin, about $2.00 at the drug store.
10-29-2014 05:12 PM
CS Cruiser
Re: Changing A Raw Water Impeller (How To)

When I store it away in a ziplock bag, whets the proper type of grease / lube safe for the impeller?
10-29-2014 04:56 PM
Re: Changing A Raw Water Impeller (How To)

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!

10-29-2014 04:08 PM
Re: Changing A Raw Water Impeller (How To)

Look at your "oil change" thread... I believe that I gave you the answer there.
10-29-2014 03:52 PM
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.

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!
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
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

For the best viewing experience please update your browser to Google Chrome