Limiting values
Service Data
Dimensions
140
Cylinder-head bolts
Length: With each tightening, the bolts
are deliberately stressed beyond the
stretch limit and each tightening thus ex-
tends their length permanently.
When the max. length has been reached,
the bolt may no longer be used.
Angle of rotation symbol
51.90490-0022:
new: 167,5-168 mm, max. 170 mm
51.90490-0023:
new: 143,5-144 mm, max. 146 mm
51.90490-0024:
new: 108,5-109 mm, max. 111 mm
Valve recess
Intake valve: 11,968-11,982 mm
Exhaust valve: 11,943-11,957 mm
Max. wear limit:
0.1 mm below base dimension
Do not reuse valves with damaged chro-
mium layer!
Valve recess for intake and exhaust
valve:
0,7-1,3 mm
Valve springs
Inner spring:
Free length (L), approx. 65,5 mm
Spring force at L = 46,3 mm: 128-152 N
Spring force at L = 32,3 mm: 255-294 N
Outer spring:
Free length (L), approx. 59 mm
Spring force at L* = 46,8 mm: 324-353 N
Spring force at L* = 32,8 mm: 696-755 N
The lowest spring force is at the same
time the wear limit value.
XXX
90
+3
Ø
L
L*
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