Cylinder head checks and inspections

Remove the cylinder heads from the support tools.

1. Using a suitable punch, force the combustion prechamber from its seating.
2. Remove seal ring.

During reassembly of the combustion prechamber, check that it does not protrude from plane of the cylinder heads more than the prescribed limits using tool N° 1.820.253.000.

Distance "A" that precombustion chamber protrudes from plane of cylinder heads
- 0.765 ÷ + 0.055

CYLINDER HEAD CHECKS AND INSPECTIONS

Checking lower plane of cylinder heads

1. Check that the lower plane is level and, if necessary, reface.

Maximum head lower plane error
0.1 mm

1. After resurfacing, check that the height of the cylinder heads exceeds the minimum value.

CAUTION: do not exceed the minimum value as this could cause serious engine malfunction.

Minimum height "A" of head after facing
144.85 mm

• Check that the surfacing of the lower plane of the head is of the required quality.