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 TM 55-1905-220-14-4
3-18. FRESH WATER PUMP - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
13. Impeller
If the impeller ceramic insert has cracks or
ceramic
scratches, and is not bonded to the impeller,
insert
proceed as follows:
a. Bake the insert and impeller
assembly at 500 (260 ) for
F
C
one hour. The insert can be
removed easily while the ad-
hesive is hot. After removing
the insert, clean the insert
area of the impeller with sand-
paper, wire brush or a buffing
wheel to remove the old
adhesive, oxide, scale, etc.
b. Wet a clean cloth with a suit-
able solvent such as alcohol
and thoroughly clean the im-
peller insert area and the
grooved side of a new ceramic
insert. Then wipe the parts
with a clean, dry cloth.
c. Place the adhesive washer in
the impeller bond area with
the ceramic insert on top.
The polished face of the
ceramic insert should be
visible to the assembler.
Clamp the ceramic insert
and impeller together with
a 3/8 inch (6.774 cm) bolt
and nut and two smooth .125
inch (0.318 cm) thick washers.
Tighten the bolt to 10 lb-ft
(14 Nm) torque.
CAUTION
Do not mar the polished surface of the ceramic insert.
3-562
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