46
Repair instructions
Checking the valve springs Cylinder head, assembly
Special tools: 9992479, 9996847
1
Clean the mating planes of the cylinder head and cyl-
inder block. Remove any rust or carbon from screw
holes and from the threads for the cylinder head fast-
ening holes. Clean the holes with a tap (M11 x 1.5).
Remove all loosened dirt with a vacuum cleaner or
compressed air.
2
Check the lining heights. Please refer to the values
noted in “Technical Data” in the workshop manual.
The difference in height between the linings under one
and the same cylinder head must not exceed 0.02
mm.
For measurement and adjustment, please refer to
“Cylinder liner position, renovation” on page 59.
3
Dip the cylinder head screws (including the screw
heads) in rust proofer, part no. 282036-3, and allow
them to run off on a piece of netting. The screws
should have stopped dripping when installed (oil could
otherwise be forced up and be regarded as leakage).
WARNING! The screws are phosphated and
must not be cleaned with a steel brush. If the
cylinder head is painted, the contact surfaces
for the cylinder head screws must be free of
paint. The clamping force in the threaded fast-
eners could otherwise be very poor.
Install the seal rings and put the cylinder head gas-
kets in place. Put the two rear cylinder head screws in
the cylinder blocks and install the cylinder blocks.
4
Check the valve spring lengths, unloaded and when
loaded by a spring tester.
The springs must maintain the values noted in “Tech-
nical Data” in the workshop manual.
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