PISTONS
AND
CONNECTING
RODS
Installing
the
Connecting
Rod
Bearing
Caps
Since the connecting
rod
cap bolts and nuts are torqued
using the plastic area tightening method, the bolts should be
examined before reuse.
If
the bolt threads are "necked
down",
the bolt should be replaced.
Necking can be checked by running a nut with fingers to the
full length
of
the bolt threads.
If
the nut does not run
smoothly, the bolt should be replaced.
Before installation
of
each nut, apply clean engine oil to the
thread portion and bearing surface
of
the
nut
Install each nut to the bolt and tighten
it
with your fingers.
Then tighten the nuts alternately to install the cap properly.
Tighten the nuts to the proper torque.
CAP
NUT
TIGHTENING
TORQUE
11+90'
turn
(15Nm
+90'
tum)
A
CAUTION:
If
the
cylinder
head
has
been
installed
before
installing
the
connecting
rod
cap
nut,
remove
the
spatk
plugs.
Make a paint mark
on
the head
of
each nut. Make a paint
mark on the bolt
end
at the position 90° to 100° from the
paint mark made on the nut in the direction
of
the tightening
nut.
Give a
90° to 100°
turn
to the nut and make sure that the
paint mark on the nut and that on the bolt are in alignment.
If
the nut is turned less than 90°, proper fastening
performance may not be expected. When tightening the nut,
rum it sufficiently.
If
the nut is overtightend (exceeding 100°), loosen-the nut
completely and then retighten it by repeating the tightening
procedure.
Engines & Generators
25
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