Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 75
The connecting rod and big-end cap consist of a single casting
which is split during the machining operation.
To prevent the big-end cap from being displaced in relation to the
connecting rod, the contact surfaces are provided with grooves
and guide pins. The surfaces are machined together to ensure a
precise and accurate fit. The parts are also marked so that they
can always be fitted in the same position.
The connecting rod and big-end cap are split obliquely, partly so
that the con rod bolts will not be subjected to excessive loads and
partly to enable the piston and con rod to be withdrawn through
the cylinder.
Connecting rods
The upper part of the connecting rod is wedge shaped. This al-
lows a larger journal surface on the underside of the gudgeon pin
where load is greatest during combustion.
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