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 TM 5-1940-277-20
TM 1940-20/2
DISASSEMBLE:
1.
Open and secure engine hatches (refer to paragraph 3-323).
NOTE
Buoyancy material must be removed to inspect starboard raw water pump (refer to para-
graph 3-152).
2.
Remove water pump (refer to paragraph 3-81).
Using screwdriver remove six screws (1) holding end plate (2).
3.
4.
Remove and clean end plate (2).
5.
Remove gasket (3) from body (4).
NOTE
Observe the position of the impeller blades to aid in reassembly.
Using pliers, grasp blade on each side of impeller (5) and pull impeller off shaft.
6.
7.
Push screwdriver through impeller (5) open end to remove spline seal (6).
8.
Remove cam retaining screw (7).
9.
Withdraw cam (8) and wear plate (9) assembly from body (4).
INSPECT
1.
Inspect impeller for:
Missing blade or portion of blade.
a.
b.
Blades permanently bent (will not return to proper shape).
c.
Wear (blade missing small pieces or ragged in appearance).
If any of the above conditions exist, replace impeller.
2.
Inspect cam for wear as follows:
a.
Check finger ends. They should not be worn to knife edge. lf they are or are approaching knife edge, replace
cam.
b.
Finger ends should not be uneven, ragged, or rough to touch.
c.
Distance (measured straight across) between opposing finger ends should not be less than 1-15/16 inch.
If any of the above conditions exist, replace cam.
3.
Inspect wear plate as follows:
a.
Check for deep grooves in plate.
b.
Check for wear to one-half original plate thickness.
If either of above conditions exist, wear plate can be reversed unless it has been turned before. In that case, a new
wear plate must be installed.
ASSEMBLE:
1.
Fit wear plate (9) and cam (8) into body (4) as an assembly. Dowel or cam fits into hole in wear plate.
2.
Using screwdriver, install cam retaining screw (7).
Rub thin film of liquid detergent (Item 5, App. C) on impeller (5) blades.
3.
4.
Fit impeller (5) on shaft and into body (4). If blades are bent to fit into body, make sure all are bent in same direction.
Push impeller (5) on shaft until flush with body (4).
5.
3-171
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