Engine Mechanical; Service Precaution; General Description 6A-2 - Isuzu 1999 RODEO Workshop Manual

6A–2 ENGINE MECHANICAL (X22SE 2.2L)

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
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.
f A liberal coating of engine oil should be applied to all
friction areas during assembly to protect and lubricate
the surfaces on initial operation.
f 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.
f At the time of installation, they should be installed in
the same locations and with the same mating
surfaces as when removed.
f 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.
f The four cylinders of this engine are identified by
numbers; cylinders 1, 2, 3 and 4, as counted from
crankshaft pulley.
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:
f 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.
f 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.
f 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 cast iron. The crankshaft is
supported by five bearings. The bearing cap is made of
nodular cast iron.
Cylinder Head
The cylinder head is made of aluminum alloy casting with
a spark plug in the center.
Valve Train
Valve system is direct–acting invertered bucket tappet.
The valves clearance adjustment are hydraulic.
Hydraulic valve lash adjustment, no adjustment
necessary.
Intake Manifold
The intake manifold is made of aluminum alloy.
Exhaust Manifold
The exhaust manifold is made of high Si–Mo nodular 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 case–harded steel. The connecting rods are made of
cast iron. The connecting rod bearings are made of steel
backed with babbitt metal.
Crankshaft and Bearings
The crankshaft is made of nodular cast iron. Pins and
journals are graded for correct size selection for their
bearing.
Balance Shaft
Type is lanchester (twin counter–rotating shafts). The
balance shafts are made of cast iron and gears are hard
faced. The housing is made of cast iron. Backlash
adjustment method is shim–balancer housing to block
(selective fit).