Water pump size for Universal 5432. note from Westerbeke on 17 July 2002 in response to my inquiry as to how much flow I should see from the Oberdorfer pump. .
GOOD MORNING MR. RITTER,
THE FLOW RATE FOR THE OBERDORFER PUMP IS 3 - 3 1/2 GALLONS PER MINUTE AT RATED ENGINE SPEED OF 2800 RPM. I DO NOT HAVE ANY CURVE TO SHOW ME WHAT THE PUMP WILL DO AT VARIOUS ENGINE SPEEDS.
THE CURRENT PUMP USED ON THE UNIVERSAL MODELS DELIVERS APPROXIMATELY 6 - 7 GALLONS PER MINUTE AT RATED ENGINE SPEED.
I AM SURE IT WOULD BE AN IMPROVEMENT OVER WHAT YOUR PRESENT PUMP IS DOING AS FAR AS COOLING.
A KIT IS AVAILABLE TO MOUNT THE CURRENT PUMP ON YOUR ENGINE IN PLACE OF THE OBERDORFER. KIT PART #302837. THE KIT CONTAINS THE NEW PUMP AND MOUNTING HARDWARE.
UNIVERSAL SOME TIME BACK BEFORE WESTERBEKE PURCHASED THE COMPANY INCREASED THE SIZE OF THE HEAT EXCHANGER ON YOUR ENGINE MODEL FROM A 2 INCH DIAMETER TO A 3 INCH. THIS WAS DONE TO IMPROVE COOLING AS WELL.
I WOULD RECOMMEND YOU INSTALL THE KIT CONTAINING THE CURRENT NEW PUMP AND SEE WHAT RESULTS.
BEST REGARDS,
JOE JOYCE
SERVICE MANAGER
Below is a high resolution picture of the Oberdorfer after I removed it. The four M6 studs, that held the two hole to four hole adaptor plate, got there threads mangled when I removed them from the engine block.
pump #301357 (Oberdorfer 202-M15) fitted with impellor #295628 (Oberdorfer impeller 6593)
pump #300986 (Sherwood M-5) fitted with impellor #287439 (Sherwood impeller 10077)
pump #302648 (Sherwood G908) fitted with impellor #302875 (Sherwood impeller 9000)
Click here to return to Failures Experienced
Click here to return to heat exchanger size change
Click here for nice cross sectional drawing of G908
Click here for a low cost upgrade to the Oberdorfer to double the flow. The following was submitted in Feb 04' by a fellow Universal 5432 owner:
After poking around some more I have found another alternative that I think I will try before replacing the Oberborfer with the G908.
I believe the pump on my engine is a Oberdorfer M202-3 (yet to be confirmed by inspection). This can be upgrade to a M202-7 by changing the cam that distorts the impeller.
The cam is easily changed, costs only $12, and the pump output is doubled. I still like the G908 better (easier impeller change and no hokey grease cup), but the cam change is so simple and cheap I have to try that first.
Check it out here http://www.moyermarine.com/upgrade.htm
The cam is also available at Depco Pump, part #6592
Here is a good data sheet for the Oberdorfer pumps.
http://www.oberdorfer-pumps.com/Spec_sheets/202mseries.pdf
This page was last updated on: January 4, 2017
This page was created July 23, 2002
Sherwood G908
Original, short 1/4-20 screw. Mine pulled out two threads the first time I replaced the impeller.
Longer 1/4-20 screw worked for now..
