In getting a quote on the N202M-908 from Depco Pump, the reply said there was a fitment issue with the N202M-908 with regard to the 90 degree barb fittings. They suggested the N202M-837 instead.
I'm thinking different barb fittings may solve that. I think the issue is the inlet and outlet are closer together with the Oberdorfer. See this thread: http://c34.org/bbs/index.php?topic=8519.0 Also note that it looks like this owner replaced the original wear plate in the Sherwood. Note the tab sticking out of the gray pump. Dennis C. On Thu, Mar 29, 2018 at 12:01 PM, Dennis C. via CnC-List < cnc-list@cnc-list.com> wrote: > For those of us who have Universal or Westerbeke diesels that use the > Sherwood G908 clamp mount raw water pump, here's some news. (The > Westerbeke number is sometimes 42175.) > > Changing the impeller on the Sherwood is a bit of a pain because the bolts > come in from behind. You can either remove the pump by removing the two > clamps, or remove the pump case by removing the 3 bolts and lifting the > case off. Then you have to make sure the o-ring is properly seated upon > reassembly. > > Another issue with the Sherwood is that it often leaks. Unlike many pumps > that have a shaft seal, the Sherwood impeller seals against a brass wear > plate on the back of the pump. If the wear plate, which is fairly thin, > bows outward or has excessive wear, the pump will leak raw water. In a > salt water environment, this tends to have a deleterious effect on the > engine front. > > I replaced the thin wear plate on my Sherwood with a thicker stainless > wear plate that I found on eBay. That helped reduce a nagging leak. > > Although I don't need it yet, I found a drop in replacement, Oberdorfer > N202M-908. This pump is a more traditional design with shaft seals. > Access to the impeller is from the front by removing the cover plate. > > The Oberdorfer N202M pump has been around for many years and is a standard > marine engine raw water pump. A version is used on the good old Atomic 4. It > fits many marine diesels by being available in several models. The > differences are in the mounts for attaching it to the engine. Some > resourceful boat owners have modified Oberdorfer N202M-16's to fit the > clamp mount configuration. Oberdorfer now offers the clamp mount as the > 908 model. > > I found one thread on a Catalina owners site which questioned the pumping > capacity of the Oberdorfer on an M-35 engine. I was not able to find the > capacities of the two pumps but found many posts from boatowners who were > using the Oberdorfer N202 series pumps on various Westerbekes and > Universals successfully. > > The other good news is the Oberdorfer is a fraction of the cost of the > Sherwood. > > I'm considering replacing the Sherwood with the Oberdorfer even though the > Sherwood is doing fine....right now. > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
