GMC 1982 Light Duty Truck, Руководство по обслуживанию

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ENGINE 6-1
SECTION 6
ENGINE
CONTENTS
ENGINE DIAGNOSIS 5.7 L (350) VIN (L) V-
8
-R P O LS9........... ..........6A4-1
Engine Performance Diagnosis............................ .....
6-1
5.7 L (350) VIN (M) V-
8
-R P O L T 9......... ..........6A4-1
Engine Mechanical Diagnosis - Gasoline.......... .....
6 - 1 0
7.4 L (454) VIN (W) V-
8
-R P O LE
8
......... ..........6A5-1
Engine Mechanical Diagnosis - Diesel.............. .....6-14
ENGINE - DIESEL
Engine Diagnosis - Electronic Spark Control... .....6D-1
6.2 L VIN (J) V-
8
-R P O LL4......................... .........
6
A
6-1
ENGINE - GASOLINE
6.2 L VIN (C) V-
8
-R P O LH
6
....................... .........
6
A
6-1
4.1 L (250) VIN (D) L-L-RPO LE3............... ....6A1-1 ENGINE CO O LIN G ........................................ .......... 6B-1
4.8 L (292) VIN (T) L-
6
-R P O L 25................. ....6A1-1
ENGINE F U E L ................................................. .......... 6C-1
5.0 L (305) VIN (F) V-
8
-R P O LF3................. .... 6A4-1
ENGINE ELECTRICAL................................ .......... 6D-1
5.0 L (305) VIN (H) V-
8
-R P O LE9............... .... 6A4-1
ENGINE EMISSION C O N T R O L S............ .......... 6E-1
ENGINE EX H A U ST........................................ .......... 6F-1
ALL NEW GENERAL MOTORS VEHICLES ARE CERTIFIED BY THE UNITED STATES ENVIRO NM EN­
TAL PROTECTION AGENCY AS CONFORMING TO THE REQUIREMENTS OF THE REGULATIONS FOR
THE CONTROL OF AIR POLLUTION FROM NEW MOTOR VEHICLES. THIS CERTIFICATION IS C O NTIN­
GENT ON CERTAIN ADJUSTM ENTS BEING SET TO FACTORY STANDARDS. IN MOST CASES, THESE
ADJUSTM ENT POINTS EITHER HAVE BEEN PERMANENTLY SEALED AN D /O R MADE INACCESSIBLE
TO PREVENT INDISCRIM INATE OR ROUTINE ADJUSTMENT IN THE FIELD. FOR THIS REASON, THE
FACTORY PROCEDURE FOR TEM PORARILY REMOVING PLUGS, CAPS, ETC., FOR PURPOSES OF
SERVICING THE PRODUCT MUST BE STRICTLY FOLLOWED A N D , WHEREVER PRACTICABLE,
RETURNED TO THE ORIGINAL INTENT OF THE DESIGN.
GENERAL IN FO R M A TIO N
STATEMENT ON CLEANLINESS
AND CARE
A vehicle’s engine is a combination of many ma­
chined, honed, polished and lapped surfaces with toler­
ances 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 pro­
tect and lubricate the surfaces on initial operation.
Throughout this section, it should be understood that pro­
per cleaning and protection of machined surfaces and fric­
tion areas is part of the repair procedure. This is consid­
ered 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 INFORM ATION ON E N ­
GINE 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.