Table of Contents
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SECTION 6
ENGINE
CONTENTS OF THIS SECTION
Page
Engine Tune Up
6-1
Torque Sequence
Engine Mechanical (In Line)
6-12
Special Tools . .
Engine Mechanical (V8)
6-24
Page
6-39
6-40
ENGINE TUNE UP
INDEX
Page
General Description .
6-1
Mechanical Checks and Adjustments
6-1
Spark Plug Removal
6-1
Test Compression
6-1
Service and Install Spark Plugs
6-2
Service Ignition System
6-3
Service Battery and Battery Cables
6-5
Service Delcotron and Regulator
6-5
Service Fan Belt
6-5
Service Manifold Heat Valve
6-5
Tighten Manifold
6-5
Service Fuel Lines and Fuel Filter . . . . . . . . . .
6-6
Service Cooling System
6-6
Check and Adjust Accelerator Linkage
6-6
Service Crankcase Ventilation
6-6
Service Air Injection Reactor System
6-6
Choke Adjustment
6-7
Page
Instrument Cheek-Out
6-7
Instrument Hook-Up. .
6*7
Check and Adjust Dwell
6-7
Check Dwell Variation
6-7
Check and Adjust Timing
6-8
Adjust Idle Speed and Mixture
6-8
Additional Checks and Adjustments .
6-8
Testing Crankcase Ventilation Valve .
6-8
Testing Cranking Voltage
6-8
Cylinder Balance Test
.
6-8
Battery
6-8
Ignition
;
6-8
Carburetor
6-11
Fuel Pump
6-11
Cooling System .
6-11
Cylinder Head Torque and Valve Adjustment
. . . . .
6-11
GENERAL DESCRIPTION
The engine tune up is important to the modern automo-
tive engine with its vastly improved power and perform-
ance. The higher compression ratios, improved electri-
cal systems and other advances in design, make today
1
s
engines more sensitive and have a decided effect on
power, performance and fuel consumption.
It is seldom advisable to attempt a tune up by correc-
tion of one or two items only. Time will normally be
saved and more lasting results assured if the technician
will follow a definite and thorough procedure of analysis
and correction of all items affecting power, performance
and economy.
The tune up will be performed in two parts. The first
part will consist of visual and mechanical checks and ad-
justments; the second part will consist of an instrument
checkout that can be performed with any one of the units
of service equipment available for this purpose. Always
follow the instructions provided by the manufacturer of
the particular equipment to be used.
Additional checks and adjustments are included in the
latter part of this section for use as required. Many of
these operations can be used to isolate and correct trou-
ble located during the tune up. Where conditions are UB-
covered requiring major corrective action, refer to the
appropriate section of this manual or the Passenger
Chassis Overhaul Manual for detailed service informa-
tion.
Typical illustrations and procedures are used except
where specific illustrations or procedures are necessary
to clarify the operation. Illustrations showing bench op-
erations are used for clarification however all operations
can be performed on the vehicle.
MECHANICAL CHECKS AND ADJUSTMENTS
Spark Plug Removal
Remove any foreign matter from around spark plugs by
blowing out with compressed air, then disconnect wires
and remove plugs.
Test Compression (Fig. 1)
The compression check is important because an engine
with low or uneven compression cannot be tuned success-
fully. It is essential that improper compression be cor-
rected before proceeding with the engine tune up.
1. Remove air cleaner and block throttle and choke in
wide open position.
2. Hook up starter remote control cable and insert
compression gauge firmly in spark plug port.
CAUTION:
Whenever the engine is cranked
CHEVROLET C*
IS SERVICE MANUAL
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