Refitting precautions

REFITTING PRECAUTIONS

Reverse the removal sequence for refitting unless otherwise specified in the following instructions.

Valve tightness check

• Fit the spark plugs in their seats.
  1. Pour some petrol in the combustion chamber so to just cover the valve caps.
  2. Let low pressure air into the intake manifolds and into the exhaust manifolds. Check there are no air bubbles in the petrol. If there are bubbles, check correct position and if required machine the valve seats (see specific paragraph).

Rocker arm journal

1. Fit the washers, the rocker arms and the springs. Turn the shaft so that the notches "A" correspond to holes "B" to let the cylinder head fastening studs through.
   2. Use pin "C" (diameter 12 mm) to make sure it is so.

Check and adjust tappet clearance

Intake side

• Refit the camshaft and measure intake valve clearance as follows:
  1. Temporarily fit the hub and respective camshaft drive pulley.
  2. Turn the camshaft with tools no. 1.822.146.000 and no. 1.822.151.000. Check whether clearance "Ga" between the cam lower radius and the corresponding cup falls into the prescribed values with thickness gauge no. 1.825.018.000 (C.6.0197).

"Ga" intake valve clearance
0.475 ÷ 0.500 mm

• If the intake valve clearance does not fall within the prescribed values, adjust as follows:
  1. Remove the bearings and remove the camshaft.