
General Description
Engine Cleanliness And Care
An automobile engine is a combination of many
machined, honed, polished and lapped surfaces with
tolerances that are measured in the thousandths of a
millimeter (ten thousandths of an inch). Accordingly,
when any internal engine parts are serviced, care and
cleanliness are important. Throughout this section, it
should be understood that proper cleaning and
protection of machined surfaces and friction areas is
part of the repair procedure. This is considered standard
shop practice even if not specifically stated.
• A liberal coating of engine oil should be applied to all
friction areas during assembly to protect and lubricate
the surfaces on initial operation.
• Whenever valve train components, pistons, piston
rings, connecting rods, rod bearings, and crankshaft
journal bearings are removed for service, they should
be retained in order.
• At the time of installation, they should be installed in
the same locations and with the same mating
surfaces as when removed.
• Battery cables should be disconnected before any
major work is performed on the engine. Failure to
disconnect cables may result in damage to wire
harness or other electrical parts.
• The six cylinders of this engine are identified by
numbers; Right side cylinders 1, 3 and 5, Left side
cylinders 2, 4 and 6, as counted from crankshaft
pulley side to flywheel side.
General Information on Engine Service
The following information on engine service should be
noted carefully, as it is important in preventing damage
and contributing to reliable engine performance:
• When raising or supporting the engine for any
reason, do not use a jack under the oil pan. Due to
the small clearance between the oil pan and the oil
pump strainer, jacking against the oil pan may cause
damage to the oil pick–up unit.
• The 12–volt electrical system is capable of damaging
circuits. When performing any work where electrical
terminals could possibly be grounded, the ground
cable of the battery should be disconnected at the
battery.
• Any time the intake air duct or air cleaner is removed,
the intake opening should be covered. This will
protect against accidental entrance of foreign
material into the cylinder which could cause
extensive damage when the engine is started.
Cylinder Block
The cylinder block is made of aluminum die–cast
casting for 75°V–type six cylinders. It has a rear plate
integrated structure and employs a deep skint. The
cylinder liner is cast and the liner inner diameter and
crankshaft journal diameter are classified into grades.
The crankshaft is supported by four bearings of which
width of No.3 bearing on the body side is different in
order to support the thrust bearing. The bearing cap is
made of nodular cast iron and each bearing cap uses
four bolts and two side bolts.
Cylinder Head
The cylinder head, made of aluminum alloy casting
employs a pent–roof type combustion chamber with a
spark plug in the center. The intake and exhaust valves
are placed in V–type design. The ports are cross–flow
type.
Valve Train
Intake and exhaust camshaft on the both side of banks
are driven through an camshaft drive gear by timing
belt. The valves are operated by the camshaft and the
valve clearance is adjusted to select suitable thickness
shim.
Intake Manifold
The intake manifold system is composed of the
aluminum cast common chamber and intake manifold
attached with six fuel injectors.
Exhaust Manifold
The exhaust manifold is made of nodular cast iron.
Pistons and Connecting Rods
Aluminum pistons are used after selecting the grade
that meets the cylinder bore diameter. Each piston has
two compression rings and one oil ring. The piston pin is
made of chromium steel is offset 1mm toward the thrust
side, and the thrust pressure of piston to the cylinder
wall varies gradually as the piston travels. The
connecting rods are made of forged steel. The
connecting rod bearings are graded for correct seze
selection.
Crankshaft and Bearings
The crankshaft is made of Ductile cast–iron. Pins and
journals are graded for correct size selection for their
bearing.
Engine Lubrication
The oil discharged by a trochoid–type oil pump driven
by the crankshaft is fed through full–flow oil filter and to
the oil gallery provided under the crankshaft bearing
cap. The oil is then led to the crankshaft journals and
cylinder head. The crank pins are lubricated with oil
from crankshaft journals through oil holes. Also, an oil
jet is fed to each cylinder from crankshaft juornals on
the connecting rod for piston cleaning. The oil pan
flange is dealed with liquid packing only; do not deform
or damage the flange surface during removal or
installation.