SECTION 10 – ENGINE – CHAPTER 1
10-19
CONNECTING RODS
Connecting rods ‘‘Teepee” (wedge) shaped at the
small end have been designed to reduce the
reciprocating weight at the piston end. The
connecting rods are of a heavy beam construction
and are assembled as a matched set to each engine.
They are retained in position by the connecting rod
big end cap and secured by two bolts per rod. The
small end of the connecting rod is fitted with a
replaceable bronze bushing, through which the free
floating piston pin is fitted. The steel pin being held
in place within the piston by two snap rings.
5
PISTONS
Pistons are constructed of an aluminium silicon alloy
with an iron insert for the top ring. The combustion
chamber being recessed into the piston crowns.
Each piston has two compression rings and one oil
control ring, to reduce friction and increase positive
sealing. All rings are located above the piston pin.
6
MANIFOLDS
The cross flow design aluminium intake, and cast
iron exhaust manifolds, are on opposite sides of the
cylinder head. This is designed to maintain balanced
heat distribution within the cylinder head. The
configuration of the manifolds also ensures minimum
heat transfer to the intake manifold.
7
TIMING GEARS
The crankshaft timing gear is heated and press fitted
on to the front of the crankshaft, to a high degree of
accuracy during manufacturing. This enables
precise timing being maintained during the life of the
engine. The crankshaft gear (2) drives the idler gear
(3) which is attached to the front of the cylinder block.
The idler gear then drives the camshaft gear (1) and
the injection pump gear (4).
The camshaft gear is bolted to the front of the
camshaft, and is keyed to maintain position
of the
gear on the camshaft.
P396–E–36
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