Westerbeke 20B TWO Tehnical Manual page 72

Assembly
a. Install the seals (ref 7) and spacer (ref 14) in the pump housing. Push the impeller side seal into the
housing. Rotate the pump and install the spacer (ref 14) against the seal face. Push the bearing side
seal into the housing from the bearing side.
NOTE: The seal's flat surfaces, having printing and numbers, face towards each other.
b. Install shaft (ref 8) into bearings. Support bearings (ref 2) at their center race. Push the shaft into the
bearings, pushing at the impeller drive slot end using the base of the drive slot. Push the shaft through
both of the bearings, flush against each other so the flat sided end of the shaft extends beyond the second
bearing center race 15 mm (19/32 in.) ±.5 mm (1132 in.).
c. Support the pump housing at the impeller side. Apply a small amount of petroleum jelly to the seal's (ref
7) inner lips and to impeller shaft (ref 8). Carefully, install the shaft rotating it through the seals till the
bearings contact the housing from the bearing end. Use a pushing tool that will push this shaft and
bearing assembly into the pump housing by applying pressure against the outer bearing race. Push the
assembly into the housing until the bearings seat fully in the housing. Install the circlip (ref 3).
d. Position the cam (ref 6) in the housing and secure it in place with the screw (ref 4) and sealing washer
(ref 5).
NOTE: Use a small amount of Permatex #1 on the inner cam surface and screw threads.
Remove any excess from the impeller housing.
e. Apply a light film
of
silicone or petroleum jelly to the inner surface
of
the housing for the impeller.
NOTE: Just coat the surface, do not over apply. Install the impeller with the drive screw (ref
9 and 10). Push the assembly into the housing with the drive screw mating in the slot of the
drive shaft.
f. Install the cover gasket (ref 11), cover (ref 12), and secure them with the six cover screws (ref 13).
Westerbeke Engines 70