DS 19 OPERATION No. DS 231-3 : Overhauling of a water pump and low pressure pump. Op. DS 231-3 151
TOOLS
Fit an abrasive paper washer on the lapping spindle (choose the grain number according to the condition of
the surface).
During the lapping, raise the lapping spindle frequently to avoid scratching the seating.
Always finish off the lapping with a washer of No. 600 abrasive paper.
Remove the lapping spindle and guide bush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lapping spindle 2289-T
e) Clean the parts very carefully using alcohol only. Blow with compressed air.
f) To fit the bronze bush (28) in the body of the water pump.
This bush should be soaked in SAE 20 oil for a minimum of ten minutes before fitting.
Offer up the bush vertically, the pump body resting on the table of a press (fixture 2288-T, mandrel (D), see
Pl. 38, fig. 3).
Put the bush in position in a press. Remove the mandrel (D) and replace by the mandrel (E) and bore the
bush with the mandrel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fixture 2288-T
10 Measure the distance “f” from the joint face and the bearing face of the seal, for example f = 39. 3 mm.
This distance should be 38. 3 ± 0. 2 mm. Consequently, in order that the seal has the same pressure, it is
necessary to add a washer 39. 3 - 38. 3 being 1 mm thick behind the thrust washer (23). Fit the washer of a
size determined above, then the thrust washer (23) on the shaft (17), the chamber towards the impellor.
Put the bush MR-3470-20 (see Pl. 41, fig. 5) on the shaft.
Put the seal (22) in position. Ease the sliding of the joint by moistening with hydraulic fluid.
Remove the bush MR-3470-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bush MR-3470-20
11 Oil the bronze bush (28) (with SAE 20 oil).
Oil the seal (22) with castor oil. Fit on the shaft (17), a spring (21), a thrust washer (18), a ring seal (19),
(use the cone MR-3384-l0, see Pl. 94, fig. 1), the cap joint (20). Compress the above until they touch the
thrust washer (18). Engage the shaft thus prepared in the water pump body Fix the shaft using the bush
MR-4251 (see Pl. 40, fig. 3) and the half retaining rings (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cone MR-3384-10
Bush MR-4251
12 Fit the overflow unions (24) and (25).
Do not refit the greaser on the low pressure pump body. Seal the orifice with a screw. Check for leakage
(see paragraphs 40 and onwards, this operation).
Fix the assembly on the stand MR-3676-180 (see Pl. 41, fig. 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stand MR-3676-180
13 Fit the key (16), the inner pinion (15), and the outer wheel (14) previously oiled with hydraulic fluid. Offer up
the body of the low pressure pump (10). Turn the assembly over in order to bring the water and hydraulic
fluid drain 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.
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