Ø
L
L*
Limit values
Service Data
Dimensions
145
Cylinder−head bolts
Length With each tightening, the bolts are
deliberately stressed beyond the stretch
limit and each tightening thus extends
their length permanently.
When the max. length has been reached,
the bolt may no longer be used.
Angle of rotation symbol
51.90490−0041 / 0070:
new: 259−259.5 mm, max. 261.5 mm
51.90490−0042 / 0071:
new: 197,5−198 mm, max. 200 mm
Valve recess
Intake valve: 8,963−8,977 mm
Exhaust valve: 8,950−8,964 mm
Valve recess: 0,70−1,00 mm
Valve springs
Inner spring:
Free length (L), approx. 64,8 mm
Spring force at L 46,38 mm: 142−158 N
Spring force at L = 26 mm: 213−239 N
Outer spring:
Free length (L), approx. 63,3 mm
Spring force at L 46,45 mm: 410−470 N
Spring force at L = 33 mm: 714−790 N
The lowest spring force is at the same
time the wear limit value.
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