39
Repair instructions
Cylinder head, planing
Special tools: 9992479, 998976.
The warpage on the cylinder head must not exceed
0.03 mm.
If the warpage exceeds this value, or if blow-by lines
occur, the cylinder
head must be planed or replaced.
Please refer to the “Technical Data” section of the
workshop manual for the minimum height of the cylin-
der head.
Surface finish after planing must not exceed 1.6 RA.
NOTE! The cylinder head on the TAMD63 must not
be planed, it should always be replaced by a new one.
After planing, new seal lands and flame edges must
be milled.
Cylinder head, milling the seal
groove
Special tools: 998976 and 9992479 + 9996841, 6(x)
series; 9996842, 7(x) series
Permitted distance (A) between the cylinder head
plane and valve head:
6(x) series 7(x) series.
Inlet valve ................. 0.7 – 1.1 mm 2.0 – 2.4 mm*
Exhaust valve ........... 0.7 – 1.1 mm 1.0 – 1.4 mm*
* TAMD72A: 0 ± 0.2 mm
If the permitted distance (A) is not met after planing,
the valve seats must be milled out.
Milling tool 9996841, 9996842,
1 Nut 5 Spindle
2 Turning handle 6 Cutting head
3 Guide plate 7 Bit holder
4 Attachment screw
1
When new grooves are milled, the cylinder head must
be planed so as to completely remove the old
grooves.
The height of the cylinder head, plus the distance be-
tween the plane of the valve heads and the cylinder
head plan must not fall below the values given in the
specifications section.
The grooving tool is centred with the flame edge
groove bit, and not with the guide plate as on other
grooving tools.
This is the reason why the guide plate attachment
screws have wide clearance in the valve guides.
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