PISTONS: Are aluminum alloy with a steel strut,
short height, and thin wall so as to be autothermic and
light weight. The piston head with valve recesses, in
combination with the cylinder head, forms a compact
spherical head with clearance for total valve lift with
pistons at top dead center. The piston skirt, top and
second ring lands are finished with curvilinear tapered
roughness for oil retention and high resistance to
scuffing. Piston pins, press-fitted into place, join the
pistons to the connecting rods.
CYLINDER HEAD: The alloy cylinder heads fea-
ture cross-flow type intake and exhaust ports. Valve
guides and inserts are hardened cast iron. Valves of
heat resistance steel are arranged in a V with each
camshaft on center. To improve combustion speed the
chambers are a compact spherical design with a squish
area of approximately 30 percent of the piston top area.
The cylinder heads are common to either cylinder bank
by reversing the direction of installation.
CAMSHAFTS: Two overhead camshafts provide
valve actuation, one front (radiator side of cylinder
bank) and one rear. The front camshaft is provided
with a distributor drive and is longer. Both camshafts
are supported by four bearing journals, thrust for the
front camshaft is taken at journal two and the rear at
journal three. Front and rear camshaft driving sprock-
ets are interchangeable. The sprockets and the engine
water pump are driven by a single notched timing belt.
ROCKER ARM SHAFTS: The shafts are retained
by the camshaft bearing journal caps. Four shafts are
used, one for each intake and exhaust rocker arm
assembly on each cylinder head. The hollow shafts
provide a duct for lubricating oil flow from the cylinder
head to the valve mechanisms.
ROCKER ARMS: Are of light weight die-cast with
roller type follower operating against the cam shaft.
The valve actuating end of the rocker arms are ma-
chined to retain hydraulic lash adjusters, eliminating
valve lash adjustment.
VALVES: Are made of heat resistant steel and are
further treated to resist heat.
VALVE SPRINGS: Are especially designed to be
short. The valve spring wire cross-section is oval
SPECIFICATIONS
Fig. 1 Engine Identification
.
3.0L ENGINE
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