With regard to replacing a Sherwood raw pump with an Oberdorfer on Universal diesels. Here's most of what I know.
Although many of the Oberdorfer pumps look similar, and, in fact, may share the same case, impeller, cam shoe, cover, etc., they differ in the mounting flange. Most are based on Oberdorfer's N202M pump. The Oberdorfer Model N202M-908 fits M-12, M-18, M20, M-25, M-25XP, M30, M40, M50. https://www.pumpsandpartsonline.com/shop/oberdorfer-pumps/rubber-impeller/rubberimpellerpumps/N202M-908 The original pump was a Sherwood G-908, hence the 908 in the Oberdorfer model. It's Oberdorfer's long made N202M pump with a mounting flange for the Universal diesels. When I changed from the Sherwood to the Oberdorfer on my Universal 25XPB, it was NOT a direct replacement. The inlet and outlet spacing was different. The Oberdorfer had smaller spacing. Why is this important? If you choose to reuse the elbows from the Sherwood pump, you can thread on the first elbow but the barb on the second one is too long to install. That is, it hits the first elbow when you try to thread it on. The simple solution is to cut a bit off the barb so it will spin past the first elbow. I did that. Wasn't a big deal. Now, if you don't feel comfortable with that, call Depco Pumps. As I recall, they will sell you the Oberdorfer pump and two elbows with shorter barbs which will thread onto the pump. -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Mon, May 3, 2021 at 6:40 PM james taylor via CnC-List < cnc-list@cnc-list.com> wrote: > Moyer Marine has an improved version of the Oberdorfer that is even better! > James Taylor > Delaney > 1976 C&C 38 > Oriental, NC > > On Mon, May 3, 2021 at 6:50 PM Dennis C. via CnC-List < > cnc-list@cnc-list.com> wrote: > >> ABSOLUTELY worth it!! The Oberdorfer pump is not only MUCH easier to >> service, it's less expensive than the Sherwood to replace. Very happy I >> switched! >> >> >> On Mon, May 3, 2021 at 5:34 PM David Knecht via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> My Universal M4-30 has a Sherwood water pump that I hate every time I >>> have to touch it (mercifully infrequent). For some reason, they designed >>> it with the screws coming in from the back, which are a PITA to get to. I >>> remember reading that there was an Oberdorfer pump that could replace the >>> Sherwood that has a standard front panel opening. Has anyone done this? >>> Was it worthwhile? Thanks- Dave >>> >>> S/V Aries >>> 1990 C&C 34+ >>> New London, CT >>> >> >> Thanks to all of the subscribers that contributed to the list to help >> with the costs involved. If you want to show your support to the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> Thanks - Stu > > Thanks to all of the subscribers that contributed to the list to help with > the costs involved. If you want to show your support to the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
