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first application is much higher than for subsequent applications. To ensure required
preload on Nylok fastener is achieved for each application, the following procedure is
mandatory assembly practice.
1. Using a suitable torque wrench, install fastener in mating piece until Nylok insert is
completely engaged. Note torque required.
2. Add torque measured in step1. to torque value on assembly drawing.
3. Complete tightening fastener to torque value determined in 2.
1. Install O-ring (28) and orifice plug (102) in discharge housing (24).
2. Install discharge housing (24) in pump case (1), from suction end of case, aligning groove in
housing (24) to stop pin hole in case (1). Install stop pin (6) with Dyna Seal (7) in case (1).
3. Install O-rings (27) on oil balance tube (26) and oil balance tube (26) in one end of inlet housing
(73). Install stop pins (3) in same end of inlet housing (73).
4. Install assembled inlet housing (73) in case (1), ensuring that oil balance tube (26) and vent pins
(3) engage holes in discharge housing (24).
5. Install tube (26) in outboard end of discharge housing (24)
6. Install balance piston (79) on inboard cover (46). Install idler stop (22) on inboard cover (46)
with cap screws (81). Torque cap screws to value on assembly drawing. Install O-ring (28) on
inboard cover (46).
7. Install inboard cover (46) on case (1) using bolts (4). Be sure that tube (26) lines up with pin
hole in inboard cover (46). Torque bolts to proper value on assembly drawing.
8. Assemble power rotor (63) and mechanical seal (25) as follows (see seal insert Figure 3 above).
a. Install seat O-ring in groove of mechanical seal (25) stationary seat. Install mechanical
stationary seat in seal seat adapter (48) ensuring that spring pin is properly positioned to
engage slot in seal seat.
b. Install spacer (38) on power rotor (63).
c. Install mechanical seal rotating assembly on power rotor (63) next to spacer (38). Apply
Loctite 242 or equivalent to seal set screws and tighten set screws.
d. Wipe mechanical seal rotating and stationary faces with a clean, lint free cloth before
assembling faces together.
e. Install assembled bearing spacer (48), with stationary seat to power rotor shaft next to
mechanical seal rotating face.
g. Install inner Truarc ring (42) in groove of power rotor (63).
h. Press bearing (49) on power rotor (63), pressing only on inner race of ball bearing (49) until
it is located next to inner Truarc ring (42).
i. Install outer Truarc ring (42) in groove of power rotor (63).
9. Install O-ring (80) in seal bore of inboard cover (46).
Summary of Contents for IMO 3220/523
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