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.

Loosen the nut (8) and remove the washer (7) and the tensioner pulley (9) from the pin (12) on the cylinder head.

Insert the tool code 88713.1806 in the pulleys to lock their rotation and use the bush supplied to loosen the fixing nuts (21) of the pulleys.

Using the tool code 88713.1821, remove the tensioner pins (12) from the cylinder heads.

Use the tool code 88713.1805 to hold the driving pulley on the engine crankcase against rotation.

If this operation is carried out with the engine installed in the frame, hold the driveshaft pulleys against rotation using the tool code 88713.2011 mounted on the alternator cover.

To fit the circlip (10) in the driveshaft seat, use the tool code 88713.2834.

To prevent the nuts working loose and consequent serious engine damage, always use new self-locking nuts on all the timing belt pulleys on reassembly.

Lock rotation of the pulleys by means of the tool part no. 88713.1805 and, using the insert supplied with the wrench together with a torque wrench, tighten the self-locking nut to the torque of 71 Nm (Min. 64 Nm - Max. 78 Nm) (Sect. 3 - 3, Engine torque settings).

Insert the tensioner pins (12) on the cylinder heads, and tighten them using the tool code 88713.1821.

Tighten the tensioner pins to a torque of 50 Nm (Min. 45 Nm - Max. 55 Nm) (Sect. 3 - 3, Engine torque settings).

Tighten the screws (22) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Insert the tool code 88713.1806 into the pulleys to prevent rotation.

Using the bush supplied with tool with part no. 88713.1806 and a torque wrench, tighten the ring nuts (21) to the specified torque of 71 Nm (Min. 64 Nm - Max. 78 Nm) (Sect. 3 - 3, Engine torque settings).

Insert the fixed tensioners (13), with bearings and washers (7), into the cylinder head pins and tighten the nuts (8) to a torque of 25 Nm (Min. 22 Nm - Max. 28 Nm) (Sect. 3 - 3, Engine torque settings).

Rotate the pulleys on the timing belt driveshaft until the timing mark on the outer roller is aligned with the mark on the clutch-side crankcase cover.

Install in the alternator cover seat the tool code 88713.2011 to prevent crankshaft rotation and lock it with the corresponding pin, tighten the M8 screw of the tool to the torque of 20 Nm.

To achieve correct timing, the screws (22) securing the pulleys to the hubs must be loose and positioned in the centres of their slots.

Approach the tool code 88765.1623 to insert the pins (F) in the timing shaft seats (G).

Position the tool code 88765.1623 with legend “UP” and the arrow facing the cylinder head cover.

First place the pins (F) of the tool with part no. 88765.1623 in the intake side pulley with the wrench of tool with part no. 88765.1623.

Place the pins (F) of tool code 88765.1623 in the exhaust side pulley manually.

Tighten manually the knobs with tool code 88765.1623 until they stop.

With a torque screwdriver (H) tighten the knob nuts of the tool with part no. 88765.1623 to the torque of 2 Nm ± 10%.

Check the timing belt tension and adjust if necessary as described in the paragraph Measuring the timing belt tension values (Sect. 6 - 11) of the vertical cylinder head belt.

Once the required tension has been reached make sure that the nut (8) retaining the tensioner (9) is tightened to a torque of 25 Nm (Min. 22 Nm - Max. 28 Nm) and the screws (22) of the vertical head are tightened to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Remove the timing shaft locking tool code 88765.1623 of the vertical cylinder head.

Approach the tool code 88765.1623 to insert the pins (F) in the timing shaft seats (G).

Position the tool code 88765.1623 with legend “UP” and the arrow facing the cylinder head cover.

Place the pins of tool 88765.1623 in the exhaust side pulley seat (G) manually.

Manually tighten the knobs with tool code 88765.1623 until they stop.

With a torque screwdriver (H) tighten the knob nuts of the tool with part no. 88765.1623 to the torque of 2 Nm ± 10%.

Check the timing belt tension and adjust if necessary as described in the paragraph Measuring the timing belt tension values (Sect. 6 - 11) of the horizontal cylinder head belt.

Once the required tension has been reacher make sure that the nut (8) retaining the tensioner (9) is tightened to a torque of 25 Nm (Min. 22 Nm - Max. 28 Nm) and the screws (22) of the horizontal head are tightened to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Remove the timing shaft locking tool 88765.1623 of the horizontal cylinder head.

Tighten the screws (4) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings) following the sequence indicated in figure.