Fig. M.2. Removing the Water Pump - TM-55-1930-209-14P-9-4

Fig. M.3. Separating the Front and Rear Pump Body Sections

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.2 approximately 3/8 in (10 mm) on the longest unsupported length of the belt (see Fig. M.1). To prevent premature wear and eventual failure, correct tension of this belt should be maintained by periodical checking and adjustment every 250 hours. Excessive belt tension, and consequent overloading of the dynamo/alternator and water pump bearings, is detrimental to both belt and bearings and may cause complete failure of one or both of these components. Insufficient belt tension, allowing belt slip, will impair the efficiency of the engine cooling system and adversely affect dynamo/alternator output. Belt adjustment is obtained by altering the position of the dynamo/alternator in the following manner. 1. Slacken off the dynamo/alternator adjusting lever setscrew, the adjusting lever to timing case setscrew and the dynamo/alternator to bracket support bolts. 2. The dynamo/alternator is now free to be moved on its support bracket towards or away from the engine to obtain the correct belt tension. Hold the dynamo/alternator in the desired position. 3. Tighten the adjusting lever setscrew, the lever to timing case setscrew and the dynamo/alternator to bracket support bolts. 4. Check that the tension is still correct. NOTE: When a new belt is fitted it is advisable to re-check the adjustment after a short running period. New belts are subject to initial stretch and early readjustment may be necessary. Fig. M.1. To Remove the Belt 1. Slacken off the dynamo/alternator adjusting lever setscrew, the adjusting lever to timing case setscrew and the bracket support bolts. Pivot the dynamo/alternator towards the cylinder block. 2. Turn the engine by hand and work the belt off the water pump and dynamo/alternator pulleys. 3. Remove the belt from the crankshaft pulley. 4. Examine the belt for wear or fraying and renew as necessary. To Refit the Belt Refitting the belt is a reversal of the removal operations. Adjust the fan belt tension as detailed. If a new belt is fitted, check the tension after a few hours of running to ensure that any slackness due to initial stretching is corrected. FRESH WATER PUMP (Closed Circuit) This is of the centrifugal type, the pump shaft which rotates within two bearings is belt driven by means of a pulley pressed onto one end and secured with a self locking nut. The drive is transmitted through the shaft to an impeller which is pressed onto the other end of this shaft. The impeller assists the circulation of the coolant around the system. Water is contained within the impeller chamber by means of a spring Fig. M.2. Removing the Water Pump.

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