10. Tap the shaft and bearing assembly out of the
bearing housing from the impeller end of the housing.
NOTICE: Be sure to protect the shaft threads!
11. Check the fit of the wear ring (7 or 7A) to the impeller
sleeve (all models) and of the diffuser wear ring (7B)
to the impeller hub (Models B054728S and B07536S
only). If clearance of either wear ring is more than
.020” total (sum of both sides), press out the wear
ring(s) and replace it.
Timing Belt Drive Disassembly
1. Disconnect and remove the exhaust primer (if used).
2. Loosen the 1/2” locknut (802B) and remove the
jackscrew (800D).
3. Loosen the nuts that hold the pump and bearing
housing to the timing belt drive case (836).
4. Slide the pump down to relieve the tension on the
timing belt. Remove the nuts and the pump.
5. Remove the cover (837) from the drive case.
6. Remove the three bolts from the taper hub in the large
sprocket (the engine shaft sprocket). Remove the hub
and sprocket.
7. Remove the timing belt from the case and inspect it
closely. Replace it if it shows any signs of deteriorar-
tion, cracks, breaks, or tears.
8. If you are removing the complete case, remove the
nuts from the studs inside the case and remove the
case.
Pump Assembly
1. Press the wear ring (7A) into the bearing housing (19).
2. Insert the shaft and bearing unit (6) into the bearing
housing (19), making sure that it butts against the
inside shoulder. Use Loctite AV 10-10 on the outside
diameter of the outer ball bearing race.
3. Install the internal retaining ring (817) in the bearing
housing groove.
4. Insert the seal retaining washer (815) in the bearing
housing.
5. Lubricate the shaft and the sealing surfaces of the
mechanical shaft seal (89) with a soap solution; then
slip the seal onto the shaft, rubber drive ring first.
6. Slide the spacer (67) over the shaft thread and locate
it against the shaft shoulder.
7. Thread the impeller (2) onto the shaft until it is seated
against the shaft shoulder. Check for free rotation and
for eye concentricity (eccentricity must not exceed
.002” T.I.R.). Use Loctite AV 10-10 on threads.
8. Oil the “O”-Ring (119B) and insert it around the fit of
the bearing housing .
9. Install the quadring (119A) around the inside boss of
the pump body (1).
10. Press the wear ring (7B - Models B5478S and
B07536 only) into the diffuser (2);
11. Install the diffuser in the pump body (1 – all models).
12. Install the pump volute case (1) on the bearing
housing and tighten the capscrews.
13. Assemble the shaft key (32A) and small timing belt
sprocket (833A) (with the split taper bushing) on the
free end of the pump shaft. After making sure that the
bushing clears the bearing housing, tighten the three
capscrews provided on the taper bushing. Measure
and record the distance between the small sprocket
and the face of the bearing housing flange (it should
be approximately 1-3/16”).
14. Install the seal flush line and fittings (820-822) on the
pump.
15. Plug the drainage and priming holes with 1/4” NPT
plugs (810).
16. Place the gasket (73) (5” O.D. x 1-1/2” I.D. x 1/32”)
and 1-1/2” NPT x 5” Companion flange (850) on the
case discharge and fasten with nuts and bolts.
Timing Belt Drive Assembly
1. Thread the four 7/16” Studs (801B) into the engine
bolting face (Models B054728S and B07536S use 3/8”
studs, 801A).
2. Install the drive case (836) on the engine crankcase
bolting face and tighten the four 7/16” nuts (802C) or
3/8” nuts (802A).
3. Install the four 3/8” studs (801A) in the drive case face
to which pump will be attached.
F00650 Page 9
Disassembly/Assembly
