SECTION C18
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REMOVING CONNECTING RODS
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Remove the connecting rods by releasing the two
self locking nuts when it should be possible to
pull the connecting rod away from the cap by hand
pressure. The bearing shells remain in position at
this stage but if they are to be re-used, they must
be protected from dirt and possible damage. It is
vitally important that at no stage are the
connecting rod end caps interchanged between rods
and it is equally important that the end caps
should not be reversed on their own connecting
rods.
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A scribe marking is used on the connecting rod
and end cap to show the correct direction of
fitting. The locating tabs on both of the bearing
shells fit to the same side of each connecting rod.
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SECTION C19
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DISMANTLING THE CRANKSHAFT
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It is to be expected that the crankshaft
assembly which is now to be stripped will contain
approximately one teacup full of oil and provision
should be made for collecting this oil in a
suitable receptacle. Before parting the crank
cheeks from the flywheel it is recommended that the
flywheel be marked e.g. "T.S." for timing side so
that it is not reversed during reassembly. Proceed
as follows:
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1
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Slacken the fixed nuts on the timing side
securing the crank cheek to the flywheel, noting
that the nuts have been centre punched during
assembly and may be expected to be extremely tight.
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2
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Jar the crank cheeks free from the flywheel
using a hammer and soft drift. The drive side
crankshaft will come away complete with the two
studs, tab washer and nuts which can now be removed
if desired.
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Dependent upon mileage there is likely to be a
considerable build up of sludge and foreign matter
in both the crank cheeks and the recess in the
flywheel. This foreign matter must be cleaned out
most thoroughly.
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Tool No. 063970 is available to remove roller
bearing races from the crankshaft.
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SECTION C20
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CRANKSHAFT INSPECTION AND REGRINDING
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Wash each crank cheek in clean petrol and blow
dry with an air line. Examine the big end journals
for scoring and remove light score marks by the use
of smooth emery tape. If there is excessive scoring
or ovality and it exceeds 0.0015 in. ( .0381 mm) on
the big end journals regrinding is necessary.
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The regrind sizes are shown in Fig. C28. The
revised big end journal sizes necessitate the use
of connecting rod shell bearings of the correct
undersize. The steel backed big end shells are
finished to provide the correct diametrical
clearance and must not, under any circumstances, be
scraped. Shell bearings are available in undersizes
of minus 0.010 in., minus 0.020 in., minus 0.030
in. and minus 0.040 in.
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