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.

Withdraw the camshaft supports (22) and (23) straight out from the cylinder head, taking care not to damage the machined faces and locating dowels (11).

Remove the exhaust camshaft (14) and the intake camshaft (15), and slide off the sealing rings (17) on their ends. Repeat the same procedure for the other cylinder head.

Service limit: 0.1 mm.

Visually inspect the camshaft tracks for scoring and abnormal wear. If any of the above defects are found, the camshaft should be renewed.

If the stud bolts (2) were removed, apply the recommended threadlocker to the short end of the stud bolts (2), i.e. the end that is to be screwed into the cylinder head. Tighten the stud bolts (2) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings).

Check that the camshafts (marked “VA” and “VS” for the vertical cylinder head and “OS” and “OA” for the horizontal cylinder head) are clean and in good condition. If the camshafts are not new, use emery cloth to remove signs of wear on the cam and support surfaces, working on a flat surface.

Lubricate with the specified lubricant (Molycote M55 Plus), the camshaft seats on both the cylinder head and the supports (22) and (23) (green zone).

Apply sealant (Three Bond 1215 liquid gasket) at the four points of the support (22) shown in red in the photo. Clean off any ex­cess sealant.

Fit the supports (22) and (23) so they are perfectly seated on the cylinder head, checking that the number stamped in zone (B) of the cylinder head is the same as the number stamped in zone (C) of the support.

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

Then tighten the screws to a torque of 22.5 Nm (Min. 21 Nm - Max. 25 Nm) (Sect. 3 - 3, Engine torque settings).

Check lifted valve as explained (Sect. 9 - 4.1, Checking valve lift).

Fit the installation tool code 88713.2861 on the camshaft and install the sealing ring on the cylinder head with the spring side.

Apply in the two areas of the cylinder heads surface a strip of about 2 mm (MAX. about 4 mm) of sealant (liquid sealant Three Bond 1215), observing the heights and position indicated in figure.

Cylinder head cover identification: The vertical head rocker cover (6) has a nib (A) on the left-hand side (exhaust side), whereas rocker cover (5) has a nib (B) on the right-hand side (exhaust side).

Tighten the screws (7) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings) following the sequence above.

If the dowel (10) has been removed, during refitting apply prescribed threadlocker and tighten to the torque of 10 Nm (Min. 9 Nm - Max.11 Nm) (Sect. 3 - 3, Engine torque settings).

Apply prescribed threadlocker to the fitting (12), start it with seal (24) and tighten it to a torque of 2.5 Nm (Min. 2 Nm - Max.
3 Nm) (Sect. 3 - 3, Frame torque settings).

Install the pipe (B) and tighten the clamp (A) to the torque of 1 Nm ± 10% (Sect. 3 - 3, Engine torque settings).

Check that the mating surfaces of the cylinder head and manifold are perfectly flat and clean and install the intake manifold (25) on the cylinder head.

Lock the fixing screws (21) to the torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect. 3 - 3, Engine torque settings) in a cross-pattern sequence (1-2-3-4).