DS 19 OPERATION No. DS 231-3 : Overhauling of a water pump and low pressure pump. Op. DS 231-3 153
TOOLS
24 Remove the bearing (extractor 1684-T, see Pl. 41, fig. 3).
Remove the steel cup (7), the half retaining rings (8) and the spring (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extractor 1684-T
25 Remove the screws fixing the low pressure pump body (10) to the water pump body.
Remove the low pressure pump body (10) and the joint from the water pump body.
Remove the thrust washer (11), the ring seal (12), the ring seal cup (13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
26 Remove the pump from the stand. Remove the pinion (15) and the wheel (14).
Press on the pump spindle (17) impellor side and remove the key (16) from the shaft.
Remove the pump shaft and impellor assembly from the body of the water pump.
Remove the ring seal cup (20), the ring seal (19), the thrust washer (18) and the spring (21) from the pump shaft.
Remove the cyclam bush (22) and the thrust washer (23) from the impellor . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
Assembly (see Pl. 37).
IMPORTANT REMARK - In order to make sure of perfect sealing after a complete pump overhaul, it is necessary
to lap the cups (13) and (20) on their thrust washers (26) and (27) and the thrust face on the pump of the seal (22)
(see paragraph 7, this operation).
27 To prepare the pump body (see paragraph 9, this operation).
28 Oil the bronze bush (28) (SAE 20 oil) and the bush (22) (castor oil).
29 Fit on the shaft (17): a spring (21), the long tag end engaged in the hole in the impellor, a thrust washer (18),
a ring seal (19) (cone MR-3384-l0, see Pl. 94, fig. 1) and the ring seal cup (20) having been lapped with the
thrust washer (27). Compress the ring seal cup (20) and engage the tag end of the spring (21) in the groove
of the cup (20).
30 Fit the shaft thus prepared in the body of the water pump. Hold the shaft by means of the bush MR-4251 (see Pl. 40,
fig. 3), and the half retaining rings (8). Fit the overflow unions (24) and (25) . . . . . . . . . . . . . . . . . . . . . . . . . Bush MR-4251
31 Check for leakage (see paragraphs 40 and onwards, this operation).
32 Remove the shaft, from the pump body and blow the parts with compressed air. Fit the new shaft in the water
pump body and put the assembly on a stand (stand MR-3676-180, fitted with the dowel pin (B), see Pl. 41, fig. 1).
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