Engine Tune-Up; Spark Plug Removal - Chevrolet CHEVY VAN G10 SERIES Service Manual

Engine T u n e - U p ............................................................................ 6-1
Engine Mechanical (In L in e ) ...................................................... 6-13
General D e s c rip tio n ....................................................................... 6-1
Mechanical Checks and A djustm ents ....................................... 6-1
Spark Plug R e m o v a l.................................................................. 6-1
Test Com pression .....................................................................6-2
Service and Install Spark P lu g s ...............................................6-2
Service Ignition S y s te m ...........................................................6-3
Service B attery and B attery Cables .....................................
Service D elcotron and R e g u la to r ..........................................6-5
Service Belts ...............................................................................6-5
Service M anifold H eat Valve ................................................. 6-5
Tighten M a n ifo ld ....................................................................... 6-5
Service Fuel Lines and Fuel F i l t e r ....................................... 6-5
Service Cooling S y s t e m ...........................................................
Check and A djust A ccelerator Linkage .............................
Service Crankcase V e n tila tio n ...............................................
Service Air In jection R eactor System ................................ 6-7
The engine tune-up is im p ortan t to the m odern autom otive
engine w ith its vastly im proved pow er and perform ance.
Emission system requirem ents, interrelated system functions,
im proved electrical system s and oth er advances in design,
make tod ay 's engines m ore sensitive and have a decided effect
on pow er, perform ance and fuel consum ption.
It is seldom advisable to attem p t a tu ne up by correction o f
one or tw o item s only. Tim e will norm ally be saved and more
lasting results assured if the technician will follow a definite
and thorough procedure o f analysis and correction o f all item s
affecting pow er, perform ance and econom y.
The tune-up will be perform ed in tw o parts. The first p art
will consist o f m echanical checks and adjustm ents; th e second
p art will consist o f an instru m en t checkout th a t can be
perform ed w ith any one o f the u nits o f service equipm ent
MECHANICAL CHECKS AND ADJUSTMENTS

SPARK PLUG REMOVAL

Remove any foreign m atter from around spark plugs by
blow ing out w ith com pressed air, th en disconnect wires an d
SECTION 6
ENGINE
CONTENTS OF THIS SECTION
Page
Engine Mechanical (V
Special Tools .................................................................................. 6-40

ENGINE TUNE-UP

INDEX
Page
In strum ent Check-Out ................................................................6-7
6
-4
A dditional Checks and A d ju stm e n ts....................................... 6-9
6-6
6-6
6-6
GENERAL DESCRIPTION
available for this purpose. Always follow the instructions
provided by the m anufacturer o f th e particular equipm ent to
be used.
latter p art o f this section for use as required. Many o f these
operations can be used to isolate and correct trouble located
during the tune-up. Where conditions are uncovered requiring
m ajor corrective actio n , refer to the appropriate section o f this
m anual o f the Chassis Overhaul Manual for detailed service
inform ation.
specific illustrations or procedures are necessary to clarify the
operation. Illustrations showing bench operations are used for
clarifications, how ever, all operations can be perform ed on the
vehicle.
remove plugs. T o disconnect wire at spark plug, grasp the bo o t
p o rtion o f the wire and apply only enough force to remove the
b o o t. Do n o t pull on wire.
8
) ...............................................................6-26
Choke A d ju s tm e n t.................................................................. 6-7
Instrum ent H o o k -U p ............................................................. 6-7
Check and A djust Dwell ......................................................6-7
Check Dwell V a ria tio n ...........................................................
Check and A djust Timing ...................................................
Adjust Idle Speed .................................................................. 6-9
Cylinder Balance T est ........................................................... 6-9
B attery ......................................................................................6-10
I g n i t i o n ......................................................................................6-10
C a rb u r e to r .................................................................................6-11
Fuel P u m p .................................................................................6-11
Cooling S y s t e m ....................................................................... 6-11
Cylinder H ead T orque and Valve A d ju s tm e n t...............6-11
A dditional checks and adjustm ents are included in the
Typical illustrations and procedures are used except where
Page
Page
6-8
6-8
C H E V Y V A N SH O P M A N U A L