Fig. M.7. Removing Water Pump impeller

Fig. M.5. Checking Impeller to Water Pump Body Clearance - TM-55-1930-209-14P-9-4_721

Fig. M.8. Removing Sea Water Pump from back of Timing Case - TM-55-1930-209-14P-9-4_723

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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COOLING SYSTEM - M.5 the engine has been laid up for any considerable length of time. This is effected by disconnecting the pipe between the water pump and the heat exchanger at its upper end, filling it with water and then reconnecting it to the heat exchanger. This pump should never be run in a dry condition and if the engine is to be withdrawn from service for any length of time, it will be necessary to pack the water pump with MARFAK 2HD grease. (Where this is not available, Glycerine may be used instead). This may be effected by removing the water pump end plate, giving access to the interior of the pump, which can then be packed with grease. This treatment is usually effective for about three months, and should be repeated prior to recommencement of service if laid up for a longer period than this. N.B. Due to considerable suction created by this type of pump, it is essential that where rubber hose pipe is employed on this side of the pump any 'runs' of hose should be reinforced internally, likewise at junctions the pipe ends should almost butt together to prevent either partial or complete collapse with subsequent overheating. To Remove the Pump 1. Uncouple the inlet and outlet water connections. 2. Remove the nuts securing the pump to the back of the timing case. 3. Withdraw the pump complete with its driving gear from the studs. The pump may be replaced by reversing the above procedure. Dismantling the Pump 1. Remove the water pump end cover plate. 2. Remove the impeller by means of a pair of pliers. If it is tight on the shaft, loosen it by holding the impeller and twisting the shaft backwards and forwards. 3. Loosen the cam locking screw a few turns, then lightly tap screw downwards to loosen the cam in the water pump body. Fig. M.6. Removing Water Pump End Cover Plate 4. Remove the cam locking screw and cam. 5. Remove wear plate from inside of impeller housing. 6. Remove the circlip on the water pump shaft and withdraw the spring loaded seal and seal seat. Fig. M.7. Removing Water Pump impeller

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