This article is going to assume you have the skills to safely and easily remove your own water pump from the engine. This one is easy and uses four bolts and a gasket to mount to the timing gear case on the engine.


In this photo you can see how the pump came off the motor. While not leaking badly the oil seal side was weeping a tiny bit of oil as shown. Also when they installed this motor they used 1" hose on a 7/8" hose barb so there was some water leakage that cause some of the corrosion. This pump appears to have never been rebuilt and the motor has 2878 hours on her so good pumps can last a long time.


This raw water pump is made by Johnson Pump as a specific OEM unit for Westerbeke. Unfortunately Johnson Pump will not sell you parts, other than an impeller, due to OEM agreements.


A new Westerbeke pump is $480.00 and the rebuild kit is $130.00. This kit includes literally everything but the pump body!! Rebuilding is the cost effective and obvious choice provided your pump body is in good condition.