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.

Remove the oil pump (C) (Sec. 9 - 2.1, Removal of the oil pump).

Lock the primary pinion (B) with the holding tool 88713.3417 and loosen the threaded ring nut (3) using the bush part no. 88713.3406.

Remove the complete primary drive gear (B) using a commercial puller and placing a brass or aluminium pad between the end of the crankshaft and the puller screw.

To check the clearance, temporarily fit the clutch bell (1) complete with the primary driven gear (A) on the gearbox primary shaft. Fix a dial gauge to the engine crankcase, positioning the stylus against a gear tooth.

Turn the driven gear (A) to mesh the teeth and check that clearance ranges between 0.05 and 0.07 mm.

Repeat the check at 16 different points of the driven gear.

If the measured values are outside the permissible tolerance limits, try changing the position of driven gear (A) on the primary shaft, leaving the driving gear (B) on the crankshaft. If the clearance is still outside the tolerance limits, replace the primary drive gear pair (1).

After checking backlash, fit the bush 88713.3406 on a torque wrench, lock the pinion (B) with the holding tool 88713.3417.

Position the washer (4) and the ring nut (3). Use the special tool (U), to tighten the ring nut (3) to a torque of 190 Nm (Min. 171 Nm - Max. 209 Nm) (Sect. 3 - 3, Engine torque settings).

Refit the oil pump (C) and check the clearance between the oil pump gear and primary drive gear on the crankshaft (Sect. 9 - 2.1, Refitting the oil pump).

Thoroughly degrease the mating surfaces of the clutch bell (1).