Raw Water Pump - Westerbeke 6.5 MCG Service Manual

RAW WATER PUMP (PN.042026)
PUMP OVERHAUL
111NNER BEARING
21 ,
16sPACER
OUTER BEARING
Disassembly
The pump when removed from the engine, will have hose
attachment nipples threaded into its inlet and outlet ports
along with the drive pulley attached to the shaft of the pump.
In most cases the hose nipples can be left in place. Note their
positioning. Remove the drive pulley.
1. Remove the four cover plate screws 3 and the end cover
8 and "0" ring 4.
2. Remove the impeller 5 using a pair of pliers, grasp the
impeller hub and pull it out of the pump with a twisting
motion.
3. Remove the screw 12 and washer 13 that holds the cam
in place. Remove the cam 14 and the inner wear plate 9:
4. Remove the brass circlip 7 and the brass holding washer
6 along with the spring half of seal 2. ·
5.
Remove the dust plate
20
along with circlip
19.
6. Support the pump body on an appropriate surface and
with a drift, push the shaft 15 with bearing assembly
17,
18, 16
and
17
out of the pump bodyl.
7. Remove the "0'' ring 10 from the shaft.
8.
Support the outer bearing
17
and push the shaft. out of the
bearing.
9.
Remove the spacer
16
and the circlip
18
from the shaft.
10. Support the inner bearing 17 and push the shaft out of the
bearing.
11. Using a thin drift, knock the porcelain half of the seal 2
out of its boss in the pump body ·1.
Inspection
Inspect all parts. Review the components in the Overhaul Kit
#046623 and proceed
to
re-assemble the pump.
Reassembly
1. Install the porcelain half of the seal 2: into it's boss in the
pump body 1.
2. Install the circlip 18 onto.the shaft. Support the inner
bearing
17
andpress the shaft into the bearing until it
contacts the circlip ..
3.
Install the spacer
16
onto the shaft. Support the shaft and
push the outet bearing 21 onto the shaft until it contacts
the spacer.
4. Apply glycerin to the "0" ring 10 and install it on the
shaft about 118" away from the inner bearing.
5. Support the pump body on an arbor press and push the
shaft and bearing assembly into the pump body until the
outer bearing just clears the boss for the circlip
19.
6. Install circllp 19 and push the shaft and bearing assembly
so
th~
outer bearing
17
just contacts the circlip
19.
Rotate
· the sl'iaft to ensure no binding.
7.
Install the dust plate
20.
8.
Apply glycerin
to
the inner surface of the
2m1
half of the
seal 2 and with a twisting motion install it over the shaft
and slide it down. until the plastic surface of the spring
seal contacts to porcelain half. Install the spring seal brass
wash~r
6
and secure it in place with the brass circlip
7.
9. Install the wear plate 9, cam 14 and secure the cam with
screw 12 and sealing washer 13.
10.
Apply glycerin to the surface of the impeller housing,
inner surface of the cover plate 8 and sealing "0" ring 4.
Fit the "0" ring into its recess in the pump housing.
11.
With a twisting motion, install the impeller
5
into the
pump so it mates properly with the slot in the shaft 15.
12.
Install the drive pulley onto the shaft of the pump. Install
the pump onto the engine. Check the ptilley/belt align-
ment. Ensure the pulley is properly secured. Re-attach the
raw water hose.
Engines & Generators
37