996 Carrera Group 1 – Part 2 Engine / PAGE 124
15 70 49 Reworking cylinder head · Check cylinder head for distortion.
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911 Carrera (996) Engine -Cylinder head, valve drive
15 70 49 Reworking cylinder head
Check cylinder head for distortion.
Check sealing surface for distortion
using a straight-edge.
Permissibleunevennessof the parting
plane: 0.05 mm.
Cylinder heads with distorted sealing
surface can be repaired by planingthem.
Permissible unevennessafter machining:
0.03 mm.
Rework sealing surface of the cylinder head
only until a flat surface has been achieved.
Wear dimension: 141.65 mm
Note on machiningthe sealing surface:
Peak-to-valleyheight = 0.015 mm
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15 7049 Reworking cylinder head 15 -137
Printed in Germany -23, 1999 99615137
:1
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