REASSEMBLING AND TESTING PUMP
Page 18 of 20
Reassembling the pump is basically the reverse of disas‐
sembly. The following guidelines will help in reassembly.
1.
Check the engine crankshaft for any corrosion deposits
that will interfere with seating and sealing of the shaft
sleeve.
2.
Lubricate all O- rings when installing.
3.
The shaft sleeve should seat down tight against the
shoulder of the engine crankshaft. It may ”pop” back
slightly on initial installation, but will seat down tight
when the impeller or drive gear is tightened onto the
shaft.
4.
When installing mechanical seal stationary ring, be care‐
ful not to scratch the sealing surface that contacts the
polished carbon sealing ring.
5.
When installing new wear rings, press them into the
bores carefully so they seat down square at the bottom
of the bore. Coat O.D. with a Never Seize type product.
Direct Mounted Pump
1.
Lubricate the crank shaft with light oil. Carefully install
O- ring followed by the shaft sleeve. Be sure there are
no burrs on the end of the sleeve.
2.
Install new wear ring if required in pump adapter and
volute body.
3.
Install the mechanical seal stationary ring in the pump
adapter, being careful not to scratch the sealing sur‐
faces. Clean sealing surface with a soft cloth and dena‐
tured alcohol.
4.
Mount pump adapter to engine. Replace the sealing
washers under the socket head cap screws that secure
the pump adapter to the engine, if they show signs of
being badly bowed, cracked or corroded.
5.
Clean crank shaft. Lubricate shaft and inside diameter of
bellows assembly with water based lubricant. Clean
primary ring with a soft cloth and denatured alcohol.
Install bellows assembly onto impeller shaft with primary
ring facing the stationary ring. Push bellows assembly
until primary ring contacts stationary ring.
Note: Discard spring retainer if included with
mechanical seal.
6.
Install the impeller. Make sure it is seating tight against
the shaft sleeve by checking for any gap where the
sleeve seats against the engine crankshaft shoulder.
These surfaces should be tight together with no gap.
7.
Complete reassembly of the pump and any fittings pre‐
viously removed.
Geared Pump
1.
Install O- ring and shaft sleeve on engine crank shaft oil
seals into gear case. Lubricate the crank shaft with light
oil. Carefully install O- ring followed by the shaft sleeve.
Be sure there are no burrs on the end of the sleeve.
2.
Before installing an oil seal in a housing, apply a thin
coat of sealant to housing oil seal seat. (Waterous
recommends Loctite Ultra Blue RTV Silicon Sealant to
Permatex Super 300). Be sure that the seal, shaft and
gear case are clean. Always install a seal with the
seal lip facing in. Apply force to the outer edge of the
seal and press in evenly.
3.
Position the gear case over the shaft sleeve on the en‐
gine and replace the four socket head cap screws and
washers. Inspect and replace washers as necessary.
4.
Insert the key, gear, hex head and washers on the en‐
gine crankshaft. Tighten screw securely.
5.
Install the mechanical seal stationary ring and oil seal in
the gear case cover adapter, being careful not to scratch
the sealing surfaces. Clean sealing surface with a soft
cloth and denatured alcohol.
6.
Install new wear rings if required, in gear case cover
and volute body.
7.
Insert the impeller shaft assembly in the gear case cov‐
er. Be sure that the retaining ring is secure in the groove
on the shaft, and that the gear spacer is in place.
8.
Using a new gasket, place the gear case cover adapter
on the gear case and replace the ten hex head screws
and lock washers.
9.
Install the impeller gasket.
10.
Clean impeller shaft. Lubricate impeller hub and inside
diameter of bellows assembly with water based lubri‐
cant. Install bellows assembly onto impeller hub with
primary ring facing the stationary ring. Push bellows
assembly until primary ring contacts iimpeller hub shoul‐
der. Clean primary ring with a soft cloth and denatured
alcohol.
11.
Install the key and then the impeller on the shaft.
12.
Install the Nord- Lock
R
washer (see Detail A of Figure
14) and impeller nut. Tighten nut.
13.
Press new wear ring if required into the volute.
14.
Place the volute over the lubricated O- ring of the adapt‐
er and replace the 4 bolts, nuts and lock washers.
15.
Complete reassembly of the pump and any fittings pre‐
viously removed.
Testing
1.
Before testing the pump, rotate the engine crankshaft
with the engine starter or rope. Spark plugs should be
disconnected. Be sure there are no abnormal rubbing
noises.
2.
The mechanical seal may leak when the pump is first
run after it has been repaired. This leakage should stop
after the seal faces run- in.
3.
With the pump running, check for unusual noises or
leaks at volute joints, adapter/gear case engine screws,
or shaft sleeve. These should be corrected before the
pump is returned to service.
