DS 19 OPERATION No. DS 231-3 : Overhauling of a water pump and low pressure pump. Op. DS 231-3 152
TOOLS
14 Fit the paper joint with the narrow part to the side nearest the inlet union (union is located near the drain pipes
(24) and (25)). Fit the body of the low pressure pump. Tighten the screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
15 Fit the cup (13), a new ring seal (12), (use the cone MR-3384-10, see Pl. 94, fig. 1), the thrust washer (11) and
the spring (9).
Compress the spring using the mandrel MR-3676-190 (see Pl. 41, fig. 6). Fit the half retaining rings (8) in
the groove of the spindle, the ground face towards the bearing.
Fit the bush MR-4251 (see Pl. 40, fig. 3). Fit the nut, check the sealing of the thrust washers (see paragraphs 43
and onwards, this operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mandrel MR-3676-190
Cone MR—3384-10
Bush MR-4251
16 Remove the bush. Unscrew the pump body screws.
Fit the bearing (6) (previously greased) using a press.
IMPORTANT NOTE - 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
17 Tighten the nut (5) to 20 - 22 ft/lbs (2.7 to 3 m.kg) (spanner 1634-T, see Pl. 41, fig. 2) and lock by tapping the
metal into the groove provided on the body of the low pressure pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spanner 1634-T
18 Tighten the screws fixing the pump to the body to 12 - 13~ ft/lbs (1.7 to 1.9 m.kg). Turn the spindle during the
tightening of the screws, to make sure there is no binding due to uneven tightening of the screws.
19 Fit the adjusting washers (3), the key (1).
Fit the pulley on the shaft.
Fit the distance washer (2), the lockwasher. Tighten the nut to 18 - 22 ft/lbs (2.5 to 3 m.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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 mm box spanner
20 Remove the pump from the stand.
OVERHAULING A PUMP (on cars produced since December 1957).
Dismantling (see Pl. 37).
21 Fix the pump on a stand (stand MR-3676-180, fitted with the dowel pin (B), see Pl. 41, fig. 1). Remove the
overflow pipes (24) and (25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stand MR-3676-180
22 Remove the pulley fixing nut, the distance washer (2), the pulley, the key (1) and the adjusting washers (3) . . . . 16 mm box spanner
23 Remove the split pin locking the nut (5) and remove the nut (5) retaining the bearing (6) (spanner 1646-T,
see Pl. 41, fig. 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spanner 1646-T
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