Group 21 Reconditioning engine
Cylinder head, reconditioning
"N
E25
Assemble cylinder head
Use drift 5218 for valve guide seals.
Use new gaskets.
The locking fork should be loosely fitted and not
tou-
ching the camshaft.
Before fitting, check that the spark plugs are clean, re-
place if necessary. Electrode gap = 0.6 mm (0.024 in).
Tightening torque 12±2
Nm
(9±1.5ft.lbs.).
E26
Clean and check rocker arm shaft
Disassemble only if necessary. (Place parts in order, so
that they can be re-assembled in the same position.)
The clearance between the rocker arm and shaft is for
new parts
0.012-0.054
mm.
(0.0005-0.0021
in).
IMPORTANT! The rocker arm contact surface on the
camshaft is face-hardened and must not be ground.
s^
Oilway
in shaft points
downwards
The flat face must be
turned towards the
circlip snap-ring
groove. Applies to
all four rocker shaft
supports
A = thin spacer
B = thick spacer
51
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