Checking and setting
51
Re-using old cylinder head bolts
Checking
Before re-using old cylinder head bolts
check them as follows:
Length
During tightening the bolts are intention-
ally stressed beyond the yield point and
therefore subjected to some permanent
elongation each time they are tightened.
The shank lengths “L” of new bolts are
109, 144 and 168 mm.
Permissible maximum lengths are 111,
146 and 170 mm respectively
.
90
+3
L
L = Shank length
Surface
The surface of the bolts must be in satis-
factory condition, i.e. the phosphate coat-
ing must be intact and there must be no
rust.
Rusted or damaged bolts or bolts elon-
gated beyond the maximum permissible
length must immediately be made unus-
able – e.g. by destroying the threads with
a hammer – and scrapped.
V-belts
The tension of the V-belts should be
checked after every 200 hours of oper-
ation.
Change the V-belts if necessary
If, in the case of a multiple belt drive, wear
or differing tensions are found, always re-
place the complete set of belts.
Checking condition
Check V-belts for cracks, oil, overheating
and wear.
Change demaged V-belts.
Testing by hand
A more precise check of the V-belt tension
is possible only by using a V-belt tension
tester.
Check with V-belt tension tester
1
Measuring tension
D Lower indicator arm À into the scale
D Apply tester to belt at a point midway
between two pulleys so that edge of
contact surface Á is flush with the
V-belt
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