DS 19 OPERATION No. DS 231-3 : Overhauling of a water pump and low pressure pump. Op. DS 231-3 154
TOOLS
33 Put in position the key (16), the pinion (15) and the wheel (14) previously smeared with hydraulic fluid.
Offer up the low pressure pump body (10), turn the assembly over in order to bring the overflow pipes (24)
and (25) one opposite the other, with the clearance holes lining up with the tapped holes in the water pump body.
Disengage the low pressure pump body (10), without moving the pinions and fit the paper joint in position. Fit
the low pressure pump body, tighten the fixing screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
34 Fit the cup (13), the ring seal (12) (use the cone MR-3384-l0, see Pl. 94, fig. 1), the thrust washer (11), the
spring (9), the long tag towards the top and the other end engaged in the groove in the cup (13).
Compress the spring (9) (tube MR-3676-190, see Pl. 41, fig. 6) and put the half retaining rings (8) in position in
the groove of the shaft with the ground face towards the bearing and the tag end of the spring engaged in the
small space between the two half retaining rings.
35 To check the thrust washer for leakage.
a) Fit the bush MR-4251 (see Pl. 40, fig. 3), the distance washer (2) on the pump shaft and tighten the nut
moderately . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bush MR-4251
b) Check the thrust washers for leakage (see paragraphs 43 and onwards, this operation).
c) Remove the nut, the washer (2), the bush MR-4251. Tighten the pump body fixing screws.
36 Fit the bearing (6) previously greased, using a press.
IMPORTANT REMARK - During this operation, support it by the end of the spindle (not by the impellor) and the
pump body in order to avoid either displacement of the impellor or damage to the pump by the key (16) of the
pinion (15) (stand MR-3676-180, see Pl. 41, fig. 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stand MR-3676-180
37 Tighten the nut (5) locking the bearing (6) to 22 ft/lbs (3 m.kg) (spanner 1646-T, see Pl. 41, fig. 4), and fit the split
pin. Tighten the pump body fixing screws (turn the spindle (17) during the tightening of the screws to make sure
there is no binding, due to uneven tightening of the screws) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spanner 1646-T
12 mm box spanner
38 Fit the pulley adjusting washers (3), the key (1), the pulley, the distance washer (2) and lockwasher. Tighten the
nut to 18 - 22 ft/lbs (2. 5 to 3m. kg). Do not turn up the lockwasher, the operation of aligning the pulley is
carried out finally when assembled on the engine (see Op. DS 231-0).
39 Remove the pump from the stand.
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