Page 135 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 7.6: Overhauling the water pump

Objectives

At the end of this exercise you shall be able to
• dismantle the water pump
• inspect the parts of a water pump
• assemble the water pump.
Requirements

Tools/Instruments Materials
• Trainee’s tool kit - 1 No. • Tray - 1 No.
• Box spanner set - 1 Set • Cotton cloth - as reqd.
• Puller, Circlip pliers - 1 No each • Kerosene - as reqd.
• Soap oil - as reqd.
Equipments/Machines
• Coolant - as reqd.
• Multi cylinder diesel engine • Grease - as reqd.
Procedure

TASK 1: Dismantling
1 Lock the water pump’s pulley hub (1) (Fig 1).

Fig 1

2 Remove the water pump pulley hub nut(8) (Fig 2).

3 Remove the water pump pulley hub. Use a puller.
4 Remove the water pump rear cover, if provided.
5 Unscrew the oil seal holder and remove the oil seal shims and gasket.
6 Place the water pump housing (3) on support and press out the water pump shaft (4) with the bearing
assembly (5) from the impeller (6).
7 Remove the inner oil seal (7) from the housing.
8 Place the water pump shaft on the tube, supporting the inner bearing’s inner race, with the shaft’s taper end
facing upward.
9 Fix the nut on the threaded end of the shaft to protect the shaft’s threads from damage.
10 Press/tap the shaft till the bearing comes out of its seat, from the water pump shaft.

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