PT 2/3 Repair Disassembly/Assembly Procedures
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5.5 Impeller and Mechanical Seal
See Graphic: wc_gr002494
Impeller Disassembly:
Impeller edges can be extremely sharp; use care when removing.
5.5.1 Loosen the knobs (a) securing housing cover/volute assembly (b) to
the pump housing and remove housing cover/volute assembly.
5.5.2 Remove impeller by turning nut (c) (molded into impeller casting)
counterclockwise. If impeller is hard to remove, use special tool (d)
(PN 0159381). Position the tool so that it holds the vanes of impeller.
Insert socket extension and use an impact wrench to turn impeller off
of shaft.
Impeller Assembly:
5.5.3 Apply Loctite 246 or an equivalent thread locking sealant to the engine
shaft and screw impeller onto engine shaft.
5.5.4 Reinstall housing cover/volute assembly (b) to the housing and tighten
with knobs (a).
Mechanical Seal Disassembly:
5.5.5 Open pump housing and remove impeller.
5.5.6 Pull the front half of mechanical seal (e) off engine shaft.
5.5.7 Pry the back half (f) of the mechanical seal from engine shaft.
Mechanical Seal Assembly:
Note:
Always replace both halves of the mechanical seal as a set.
Clean the mating surfaces (carbon and ceramic) with alcohol before
installing.
Note:
If the carbon face (g) has worn flush with surface of the seal,
replace the mechanical seal to prevent pump from leaking.
5.5.8 To ease installation, apply a thin film of lubricant to the O-ring (h) of the
back half of the mechanical seal.
5.5.9 Position the back half (f) of the mechanical seal so that the grooved
ceramic ring (i) faces the engine, and then slide it onto the engine
shaft.
5.5.10 Position the front half (e) of the mechanical seal so that the carbon
portion faces the engine, and then slide it onto the engine shaft.
CAUTION
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