Insstall the service tool – rocker arm – spring assembly in the cylinder head and insert the shaft (4) with a new seal ring (5), suitably lubricated.
Caution! When assembling the rocker arm shafts (4) make sure that threaded hole is on the external side of the cylinder head.
Detach the spring (9) and remove the tool no. 88713.2783.
Proceed in the same way for the exhaust side.
Install the valve (17) and valves (16), first lubricating them with engine oil.
Provisionally install the camshaft (C).
Using two screwdrivers, hold the closing rocker (18) in the "valve open" position.
Fit the closing shim (8) on the valve stem (17) with the larger diameter side facing the rocker arm.
Position the two half rings (7) on the valve stem.
Remove the screwdriver and position the closing rocker arm (18) in the rest position.
With the valve in rest position and while pushing on the rocker arm to oppose the force of the return spring, check that the clearance between the rocker and the closing shim is within the specified tolerance limits (Checking the closing clearance (Sc) of the intake/exhaust valves).
If not, adjust the valve clearance (Checking and adjusting valve clearances).
Once the specified clearance has been obtained, remove the camshaft (C), lubricate it with graphite oil and reinstall it in the cylinder head.
Insert the rocker arm shaft (4) with the threaded hole on the external side of the cylinder head: the seal (5) should be renewed on installation; lubricate it before fitting.
Locate the opening rocker arm (3) and the two shims (2) on the shaft (4).
Refit the camshaft end cap (Refitting the camshaft end caps).
Refit the camshaft timing pulleys (Refitting the timing belt driveshaft pulleys).
Locate the valve opening shim (6) on the valve stem.
With the valve in rest position, check that clearance between the rocker arm (3) and the shim (6) is within the specified tolerance limits (Checking the opening clearance (Sa) of the intake/exhaust valves).
If not, adjust the valve clearance (Checking and adjusting valve clearances).
Fit the side clip (1) on the shaft (4) of the opening rocker arm (3) between the two spacers (2).
| Operation | Section reference |
| Refit the valve covers | Refitting the valve covers |