Oberdorfer Seals Replacement

The trusty Oberdorfer Raw water pump seals can be replaced easily if they start to leak. Part number is 11691, available from http://www.pumpsandpartsonline.com ( Also Known as Cardinal Pumps) for $ 50.00 ( 2016) No sales tax,  ( $ 83.00 2023, free shipping) ( $97.50 9/2025),  shaft part number 8767  $ 73.70 ( free shipping)
The seals include upper and the lower seals plus the middle cylindrical seal, the carbon bearing the "O" ring and impeller and snap ring.
To remove them I used a screw driver and a hammer to push them out. One has to be carful not to scratch the walls.
Inserting is easily done using a vice and socket wrench of 13/16 size. Use loctite No. 620 on the outside of the metal seals to keep them from leaking, then insert them.
After I installed them I found them slightly leaking after about 100 hours of use.
I removed the impeller and the shaft. I cleaned both the shaft and the surfaces of the seals with paper towel.
I applied a small amount of Lano_Cote  both to the seals and the surface of the shaft and inserted back into the housing.
I found that this stops the leak completely.

Manufacturer
Features: https://www.oberdorferpumps.com/en/flexible-impeller-pumps/n202m/
800 448-1668

Pumps and Parts Online  ( Cardinal Pumps)
pumpsandpartsonline.com
431 Brown Road
St. Peters, MO 63376
800 536-7867

Grainger
Seal 61CK17  $ 14.87, it is unclear if this double lip seal is suitable for marine use since it is made of MBR and its garter spring is not stainless material. Its dimensions match the requirement.

Currently I am testing the single lip version of the above lip seal Grainger part number 61AA52 $12.88. With 20 hours of engine time there is no water leaks.

Source for the seals:  as of 01-2024 untested
www.mcmaster.com
Part Number 5154T83  $ 10.47 each
OD=1.25", ID 0.625" , thickness 0.266"
See data sheet below

Another Alternative:
https://www.jmpusamarine.com/search/?q=JPR-WB7108       $ 454.00 From   Bigblueoceanmarine.com

 

View the complete Album HERE

Since my last posting above - I found that I could use steering wheel puller to remove and insert all 3 seals with much control, the seals writing text must face each other when inserted
View these Album Images to see how.

Watch the manufacturer video. I do not agree with the hammering part, since it may cause injuries to your hand.

UPDATE - 03-2023 - The Youtube video link was removed as Youtube had removed the video.

Upload File: 
AttachmentSize
PDF icon Seals Data Sheet227.42 KB
PDF icon Specifications592.92 KB

Comments

Bill Dolan (not verified)

Thu, 05/26/2022 - 19:29

While the YouTube video mentioned above gives one a good idea on rebuilding the Oberdorfer water pump, it falls short on installing the the graphite bearing that usually accompanies a rebuilding kit. In the above video, they recommend pounding this bearing with a hammer and that is a sure way to break this glass fragile part. A more successful method of installing this bearing is to apply a slow steady pressure and heavily lubricate it (WD-40) while it is being inserted into the pump body. We've found that applying this even pressure can easily be done with an eight inch 'C' clamp from Harbor Freight. The eight inch clamp easily accommodates the size pump body and greatly simplifies the installation of this fragile part into place.
Haro's picture

Haro

Fri, 05/27/2022 - 13:05

Hi Bill,
You have the correct idea.
I used large steering wheel puller to remove and insert the 3 seals.
Please view images in the Album

Xavier (not verified)

Sun, 10/16/2022 - 16:07

Is using WD 40 alright when there is loctite on the walls of the seals?

Allan Kaplan (not verified)

Fri, 02/24/2023 - 22:24

Greetings, Have you got a current public link for the Oberdorfer video? It says it's private when I try to watch it. Thanks. Also,it was mentioned to use WD-40 to install the bearing; I am under the impression that petroleum products shouldn't be used around the rubber/neoprene/etc. parts. Perhaps soapy water or silicone spray/grease? Cheers, Allan
Haro's picture

Haro

Sat, 02/25/2023 - 11:58

Hi Alan, I am not sure why the video displays as private. If you go to manufacturer site it it shows this video. Basically not a good way to replace these seals as there is a good chance they will be damaged.

UPDATE: I have deleted the video feed as it was removed from Youtube.  03-2023

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