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ENGINE MECHANICAL
6A-1
SECTION 6A
ENGINE MECHANICAL
L-4, V6 AND V8 ENGINES
CONTENTS OF THIS SECTION
2
.......................................................
23 1 ~ a ~ o d e
C
6A3- 1
...................................
General Information
...............................................
6A- 1
350-403 V8 Codes R and K
6A4-1
................................
Mechanical Diagnosis.
............................................
6A- 1
301-350-400 V8 Codes Y-P-Z
6A5-1
...................................
140 L-4 Code B
......................................................
6A1-1
305-350 V8 Codes U and L
6A6-1
15 1 L-4 Code V
...................................................
6A2-1
GENERAL INFORMATION
An automobile engine is a combination of many
machined, honed, polished and lapped surfaces with
tolerances that are measured in the ten thousands of an inch.
When any internal engine parts are serviced, care and
cleanliness are important. A liberal coating of engine oil
should be applied to friction areas during assembly to protect
and lubricate the surfaces on initial operation. 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.
Whenever valve train components 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.
GENERAL INFORMATION ON
ENGINE SERVICE
THE FOLLOWING INFORMATION ON ENGINE
SERVICE SHOULD BE NOTED CAREFULLY, AS IT
IS IMPORTANT IN PREVENTING DAMAGE AND
IN
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 screen, jacking against
the oil pan may cause it to be bent against the pump screen
resulting in a damaged oil pick-up unit.
It should be kept in mind, while working on the engine,
that the 12-volt electrical system is capable of violent and
damaging short 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 carburetor or air cleaner is removed, the
intake opening should be covered. This will protect against
accidental entrance of foreign material which could follow
the intake passage into the cylinder and cause extensive
damage when the engine is started.
IN
THE
MECHANICAL
PROCEDURES
DESCRIBED IN THIS SECTION, GENERALLY NO
REFERENCES WILL BE MADE TO THE REMOVAL
OF OPTIONAL EQUIPMENT SUCH AS POWER
STEERING
PUMP,
AIR
CONDITIONING
COMPRESSOR, ETC.
SHOULD IT BECOME NECESSARY TO REMOVE
ANY SUCH ITEM TO PERFORM OTHER SERVICE,
REFER TO THE APPROPRIATE SECTION OF THIS
SERVICE MANUAL FOR SPECIFIC INFORMATION.
TROUBLE DIAGNOSIS
The following diagnostic information covers
common problems and possible causes. When the
proper diagnosi~ is made, the problem should be
corrected
by
adjustment,
repair
or
part
replacement as required. Refer to the appropriate
section of the manual for these procedures.
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