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 screw (27) securing the tensioner pulley of the horizontal cylinder timing belt and move the tensioner pulley (21) to the rest position.

To remove the camshaft pulleys, install the tool 88713.3152 on the pulley to be removed to prevent its rotation, and using service socket no. 88700.5644 inserted in a torque wrench or ratchet arm, loosen the pulley retaining nut (13).

Use the wrench of tool no. 88700.5644 to lock rotation of the timing belt driveshaft pulley on the crankcase and, using the socket combined with the tool, loosen the nut (6).

Remove the spacer (5) and the circlip (25).

To disassemble the pulleys, loosen and remove the three screws (12), slide of the washer and (15) and remove the pulley (16) from the flange (17).

To reassemble, fit the pulley (16) on the hub (17), aligning the timing mark (G) on the pulley with the timing mark on the (H) on the hub.

Fit the washer (15) against the pulley, aligning the timing notch (I) with the timing marks (G) and (H) on the pulley and the hub respectively.

During reassembly, take care that the timing mark “B” on the spacer flange is aligned with the mark “A” on the pulley and washer.

Fit the tool no. 88713.3152 onto the pulleys to prevent rotation.

Using the socket of service tool no. 88700.5644 in combination with a torque wrench, tighten the nuts (13) to their specified torque (Sect. C 3 Engine torque settings).

Install the circlip (25) on the pulley side of the timing belt driveshaft. Drive it into its seat using the protective cap 88700.5749 and the relative drift.

Locate on the timing belt drievshaft, the first Woodruff key (26), the inner pulley (22) the intermediate spacer (10) and the second Woodruff key (24).

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.

Use the wrench of tool 88700.5644 to restrain the pulleys against rotation and, using the bush of the tool in a torque wrench, tighten the self-locking nut to the specified torque (Sect. C 3, Engine torque settings).

If removed, apply the recommended threadlocker to the idler pulley (11) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Position the crankshaft so that the piston of the horizontal cylinder is at TDC of its power stroke. This is achieved by aligning the timing mark (P) on the timing belt driveshaft pulley (8) with the reference notch (Q) on the crankcase cover.

Install the service tool 88713.2011 in the alternator-side crankcase cover to hold the crankshaft against rotation and secure it with the relative pin.

Restrain the camshafts of both cylinder heads by screwing tool no. 88713.2282 into the camshaft end caps (E).

Locate the tensioner pulleys (21) on the vertical and horizontal cylinders. Screw in, but do not tighten at this point, the screws (27) and (20), so that the tensioner pulleys can rotate.

Check the timing belt tension and adjust if necessary as described in the paragraph “Measuring timing belt tension” (Sect. D 5).

When the correct belt tensioning value is reached, ensure that bolts (20), (27) and (12) are tightened to the specified torque (Sect. C 3, Engine torque settings).

Whenever you renew any components of the timing system, it is good practice to also check the timing (Sect. N 4.1, Cylinder head assemblies: checks and adjustments).

Remove the service tools no. 88713.2282 from the camshaft end caps (E) and refit the screws (F) with the washers, tightening them to the specified torque (Sect. C 3, Engine torque settings).

Remove the crankshaft locking tool 88713.2011 unscrewing first the pin and then the screw from the tool.

Tighten the bolts to the specified torque (Sect. C 3, Engine torque settings).

Fit the cover retaining screws (4) and tighten to the specified torque (Sect. C 3, Engine torque settings).

Tighten the screws (4) and (3) to the specified torque (Sect. C 3, Engine torque settings).