Exhaust side

1. Remove the cups and remove the tappet clearance adjustment caps.

1. Measure cap thickness with tool no. 1.824.034.000 (and gauge). Then choose from set no. 1.820.150.000 (R.9.0001) those suitable to restore correct tappet clearance.

• Refit the caps, the camshaft and the respective bearings. Fasten the bearing nuts as prescribed and measure the intake valve clearance.

Exhaust side

• Refit the camshaft and measure intake valve clearance as follows:

1. Turn the camshaft with tools no. 1.822.146.000 and no. 1.822.151.000. Check whether clearance “Gs” between the cam lower radius and the corresponding cup falls into the prescribed values.

"Gs" exhaust valve clearance
0.275 ÷ 0.300 mm

• If the intake valve clearance does not fall within the prescribed values, adjust as follows:

1. Loosen the adjustment screw lock nut with tool no. 1.822.016.000 (A.5.0220) intermediate lever.
2. Turn the adjustment screw with the tool to reach the prescribed exhaust valve clearance.

Lock the lock nut and check tappet clearance.

Crankshaft refitting

• Fit the crankshaft with half-bearings and thrust half-rings on the crankcase.

NOTE: Refit the half thrust rings with the grooved surfaces facing the crankshaft.

• Fit the main bearings and half-bearings on the journals according to the numbers. Fasten to the prescribed torque.

NOTE: Use goniometer no. 1.860.942.000 for angle torque.

NOTE: The safety notches on the crankcase and on the main bearings should be on the same side.

25 Nm + 79°
2.5 kgm + 79°