Group
21
Reconditioning engine
Cleaning, checking
C4
Measure cylinder diameter
Use a dial indicator
(50-100
mm =
1.97-3.94
in).
Measure max. wear 30 mm (1.18 in) from block surfa-
ce.
Measure
min.
wear at lower turning point of piston.
See specifications on page 3 for diameter of new
parts.
Calculate piston clearance
Example:
Cylinder bore, measured diameter min. 91.010
Piston diameter, measured 90.085
max. 91.035
90.985
Piston clearance min. 0.025
Piston clearance for new parts:
max. 0.050
B27 Demolin
piston 0.090-0.110 mm
(0.0035-0.0043 in)
Mahle
piston
0.020-0.040
mm
(0.0008-0.0016 in)
B 28 Mahle piston 0.020-0.040 mm
(0.0008-0.0016 in)
If clearance is too large replace liners, piston and
gud-
geon pin. These parts are matched and can only be pur-
chased in kits of six.
Remove liner if piston/liner is to be replaced.
Proceed
to
C5
Clean mating surface on cylinder block and
liner
Use a plastic putty knife to avoid damage.
C6
Mark position of cylinder liner before removing
liner
Mark position and number of each liner. Do not scratch
surface.
27
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