Remachining Cylinder-Head Mating Surface

REMACHINING CYLINDER-HEAD MATING FACE





Checking cylinder head for distortion

Use a feeler gage an a straight edge or a precision straight edge to check the mating face of the cylinder head for distortion.

Permissible mating face unevenness: 0.05 mm

Cylinder heads with distorted mating faces can be remachined and reused.

Permissible rough after finishing: 0.03 mm.

Remachining Cylinder Head

Do not remove more material from the cylinder head mating face than is necessary to achieve a smooth surface. Max. machining depth 146.6 mm.

Note on machining mating face:
Peak-to-valley = 0.015 mm

If the new dimension tolerance is exceeded during machining a cylinder head gasket with a thickness of 1.4 mm must be fitted.

Size new = 147 ± 0.1 mm
Size worn = 146.6 mm

Cylinder head refacing dimension and identification
New dimension : 147 ± 0.1 mm
Gasket : 1.1 mm
identification . none

Refacing dimension : 146.8 to 146.6 mm
Gasket : 1.4 mm
Identification . N

Identification "N"
To be embossed on exhaust side, between cylinders no.2 and 3, on the casting lug below the sealing face of the cylinder head cover.

Punch character height "N" = 6 mm.