Westerbeke 20B TWO Tehnical Manual page 71

Raw Water Pump Overhaul
Raw water pump #033636 repair instructions are as follows:
Disassembly
The pump, as removed from the engine, will have hose attachment nipples threaded into the its inlet and
outlet port. They may be left in place or removed if they interfere with the pump disassembly. Note the
port location and positioning if removed.
a. Remove the six cover plate screws (ref 13), cover plate (ref 12) and the cover plate gasket (ref 11).
NOTE: Screw material should be stainless steel part number 034463. Also, replacement of
the cover plate gasket is recommended; however, if you are going to reuse it, keep the gasket
submerged in water until the pump is reassembled. If it's allowed to dry, the gasket will shrink
and not be reusable
b. Remove the impeller (ref 9) with its drive screw (ref 10) from the pump housing.
c. Remove the screw (ref 4) and sealing washer (ref 5) and draw the cam (ref 6) from the pump housing.
d. Remove the circlip (ref 3).
e. Support the pump housing, at the mounting flange end, on an arbor press and, with a drift, press out the
shaft (ref 8) and bearings (ref 2) from the pump housing from the impeller end.
f. With the pump housing supported, push the seals (ref 7) out of the pump housing. Push the impeller side
seal out that side and then lift the spacer (ref 14) out. Then, push the bearing side seal out that side.
g. Supporting the bearings inner face (ref 2), push the shaft (ref 8) out of the bearings.
NOTE: Inspect all parts and replace those showing wear or corrosion.
69
Westerbeke Engines