Group 21 Reconditioning engine
Cleaning, checking
c
f\
UJ
/T?
'
Taper
Out-of-round
C18
Clean and check crankshaft, main bearing caps
and main bearings
Clean oilways in crankshaft with a piece of wire and
blow clean.
Also check sealing surfaces on crankshaft.
IMPORTANT! Do not interchange bearing caps and
shells.
C19
Measure crankshaft
Measure out-of-roundness and taper of crank pins. Use
a micrometer and take measurements at several diffe-
rent positions.
Max. out-of-round 0.007 mm (0.0003")
Max. taper 0.01 mm (0.0004")
Crank pins can be ground to a smaller size, see speci-
fications on page 9.
If
crankshaft is thought to be out-of-true check with a
dial indicator.
Support crankshaft by two outer main bearings on a V-
block.
Rotate one turn and measure out-of-true for two centre
crank pins. Out-of-true = max. 0.02 mm
(0.0008
in).
IMPORTANT!
B
27
E 1975
models may be fitted with early
type crankshafts, see C20.
31
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