CITROEN DS 19 - Page 152

DS 19 OPERATION No. DS 231-3 : Overhauling of a water pump and low pressure pump. Op. DS 231-3 150
TOOLS
Assembly (see Pl. 37).
9 To prepare the pump body
a) If the body of the water pump has no groove at ‘e’ (see fig. 5), cut one with a chisel.
Remove the burrs.
Do not damage the joint face.
b) To fit the thrust washers (26) and (27) (if required).
Heat the pump body (see paragraph 7b).
Fit the thrust washers with a press (see Pl. 38, fig. 1, for positioning) (mandrel 2292-T). Maintain the pressure
for approximately 30 seconds, the time necessary for the thrust washer to heat and expand and the body of the
pump to cool and contract, in order to avoid this washer lifting when the mandrel is withdrawn, which would
cause leakage.
Leave the parts to cool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anvil and mandrel
2292- T
c) To lap the thrust washers and joint cups.
1. Low pressure pump body (use a lapping spindle 2289-T, see Pl. 38, fig. 2)
Fit the guide bush (A) in place of the bearing.
Tighten the nut (B).
Fit on the spindle (C), the spring (9), the thrust washer (11), a ring seal (12), a cup joint (13).
Put the ring seal in position in the cup by compressing until it rests on the thrust washer.
Put a small quantity of very fine polishing paste on the seating of the cup joint and lap the thrust washer.
Do not exert pressure on the lapping spindle.
Make sure that there are no burrs round the screw holes, which will cause leakage. If necessary, remove
the burrs with a scraper.
2. Water pump body (use lapping spindle 2289-T, see Pl. 39, fig. 2).
Fix the body of the pump on the guide bush (A).
Hold the bush in a vice. Tighten the vice moderately.
Fit on the spindle (B), a spring (21), a thrust washer (18), a ring seal (19), a cup joint (20) and carry
out the same procedure as in the previous paragraph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lapping spindle 2289-T
d) Lap the thrust face of the seal on the body of the water pump (lapping spindle 2289-T, see Pl. 39, fig. 1). This
operation is necessary in order to avoid leakage.
The abrasive paper washers should be moistened with water or alcohol.