Connectine Rod
insert the nev:. Ensure that the oilw-j.; are aligned. When reamering the bush.
care must be taken to ensure that the bore is parallel with the big-end.
The final examination
is
the
fit
of the main bearings on the crank timing and driving
shafts. The bearings should be a tight push
fit
;
a loose fitting bearing would tend
to cause crankcase "rumble".
Assembly. Place the bottom end of the flywheel in the vice and position the timing
and driving side cranks to their respecrive sides. Fit six
NEW
bolts and nuts (the
old parts should never be re-used), and fully tighten. Lock the nuts by centre
punching the periphery of the thread.
Oil
the journal bearings and tit the respective
connecting rods. Before doing this, measure the overall length of the connecting
rod bolt with a micrometer; during the tightening process the bolt
will be stretched.
Again the micrometer should be employed and when the bolt has stretched ,007"
(0.178 mm.)-.008" (0.203 mm.)
it
is then under correct tension and must not be
furrher tightened. Apply the nozzle of an
oil
gun to the timing shalt oilway and
pump oil through the crankshaft until
it
passes the connecting rod bearings.
T
BOLT
LENGTH
PLUS
.008"
(.2032
m/rn
)
I
Fig.
17.
CHECKING CONNECTING ROD BOLT STRETCH
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