Bold reference numbers in this section identify parts not shown in the figures alongside the text, but which can be found in the exploded view diagram.

Clean the pump housing of any scale. Check the bearings wear by turning the impeller shaft (10); in case of excessive clearance, it is necessary to replace them by operating as follows.

Remove the circlip (3) on the impeller shaft and the washer (4) located below it.

Slide off the rotor (10) with the sealing ring (9) from the outside.

Working from the impeller side, use a suitable drift to press on the inner race of end bearing (5) until it can be extracted from the cover.

Working from the inside of the cover, remove the counterface (8) of the mechanic seal (9).

Check the condition of the components of the mechanical seal: there should be no signs of deformation, cracking, or excessive wear. In the case of damage, both components must be renewed.

Using pad with code 88713.0869 fit the new mechanic seal (9) on the impeller shaft.

Using a suitable drift that bears on the outer race, drive home the bearing (6) against the spacer (7) with the shield side (B) facing the cover.

Fit the two screws (1) with washer (2), and tighten them to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Turn over the cover and, using the tool code 88713.0870, install the counterface (8), located as shown in figure, until it stops against the spacer (7).

Insert the impeller shaft (10) with the mechanic seal (9) and turn the cover over.

Tighten the screws (13) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Tighten the screw (18) to a torque of 13.5 Nm (Min. 12.5 Nm - Max. 14.5 Nm) (Sect. 3 - 3, Engine torque settings).