Torque guide values
176
Reuse of used cylinder−head bolts
Check
Before used cylinder−head bolts are reused, they
must be checked as follows:
Length
With each tightening, the bolts are deliberately
stressed beyond the stretch limit and each
tightening thus extends their length permanently.
Surface
The bolts must have a perfect surface, i.e. closed
phosphatisation and no rust stains.
Rusted or damaged bolts or bolts stretched be-
yond the maximum length are to be made unus-
able immediately − e.g. by hammering the thread
− and to be scrapped.
90
+3
L
L = shaft length
Shaft lengths “L”
in the case of new
bolts
Largest permitted
dimension
109 mm 111 mm
144 mm 146 mm
168 mm 170 mm
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