DS 19 OPERATION No. DS 231-3 : Overhauling of a water pump and low pressure pump. Op. DS 231-3 155
TOOLS
CHECKING THE BUSH FOR LEAKS (see Pl. 40, fig. 1).
40 To carry out this test, it is necessary to obtain a supply of compressed air at a pressure of 14 p.s.i.. (1 kg/cm
2
).
Use an acetylene cylinder connected on a compressed air pipe.
Close the hole “a” of the pump with a plug. Connect the drain pipe union (25) to the outlet of a pressure
regulator, using a rubber pipe. Set the pressure to 14 p.s.i. (1 kg/cm
2
).
41 Completely immerse the pump in hydraulic fluid. There should be no air bubbles visible.
If air bubbles are seen escaping at “b”, the thrust washer (27) is leaking, it is therefore necessary to repeat the
lapping operation.
If air bubbles are seen escaping at “c”, the seal (22) is leaking and should be reseated.
42 Disengage the pump. Disconnect the pipe from the pressure regulator.
Remove the plug.
Remove the bush MR-4251.
CHECKING THE THRUST WASHERS FOR LEAKS (see Pl. 40, fig. 2).
43 Fit the pipe (29), part number DS 314-91 or DS 314-87 on the outlet union “d” of the pump.
Fit a plug and a sealing washer on the feed union.
Connect the pipe (29) to the outlet of a pressure regulator, using a rubber pipe. Set the pressure to 14 p.s.i.
(1 kg/cm
2
).
44 Completely immerse the pump in hydraulic fluid.
There should be no air bubbles visible.
If air bubbles are seen escaping at “e”, the thrust washer (26) is leaking, it is therefore necessary to repeat the
lapping operation.
If air bubbles are seen escaping though the hole “a” or through the hole for the union (25) (see fig. 1), the thrust
washer (27) is leaking, it is therefore necessary to repeat the lapping operation.
45 Disengage the pump. Disconnect the pipe from the pressure regulator. Remove the pipe (29) and the plug.
46 Clean the pump with alcohol. Blow with compressed air.
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