Air Injection Systems - Jeep J-10 Series 1982 Technical & Service Manual

EXHAUST SYSTEMS 1K-7
AIR INJECTION SYSTEMS
Coolant Temperature Switch Replacement
Downstream Air Injection Tube Replacement
Dual Air Injection System
Dual Air Injection System Diagnosis
Page
1K-12
1K-13
1K-11
1K-12
GENERAL
The basic air injection system for both six- and eight-
cylinder Jeep engines incorporates a belt-driven air
pump, a vacuum controlled diverter (bypass) valve, air
injection manifold(s) with check valve(s) and connecting
hoses (figs. 1K-8 and 1K-9).
NOTE: Four-cylinder Jeep engines are not equipped
ivith an air injection system.
Air is discharged from the air pump to the diverter
valve, which either directs it to the air distribution
manifold(s) or vents it to the atmosphere through a
bypass vent, depending on engine operating conditions.
System air pressure is maintained at approximately 5
psi (35 kPa) by a relief valve located within the diverter
valve assembly.
Air is routed through the air injection manifold(s) into
the engine exhaust port areas. The air mixes with hot
exhaust and promotes additional burning of the mix
ture. This reduces hydrocarbon and carbon monoxide
emission to the atmosphere.
There are two Air Systems used with six-cylinder
Jeep engines, the basic (single) air injection system
(used for 49-State CJ vehicles) and a dual air injection
system (used for California CJ vehicles and all Chero
kee, Wagoneer and Truck vehicles).
AIR INJECTION
MANIFOLD
AIR PUMP-TO-
AIR PUMP DIVERTER VALVE VAICUUM HOSE
HOSE FITTING
43040
Fig. 1K-8 Basic Air Injection System—Six-Cylinder Engine
DIVERTER
VALVE-
TO-AIR
INJECTION
MANIFOLD
HOSE
General
Single Air Injection System
Specifications
Page
1K-7
1K-7
1K-13
AIR INJECTION
MANIFOLD
DIVERTER
VALVE
DIVERTER VALVE-
TO-AIR INJECTION
MANIFOLD HOSE
VACUUM HOSE
TO MANIFOLD
VACUUM SOURCE
' /
CHECK
VALVE
AIR INJECTION
MANIFOLD
AIRPUMP-TO-
DIVERTER
VALVE HOSE
DIVERTER
VALVE-TO-AIR
INJECTION MANIFOLD HOSE 42006
Fig. 1K-9 Air Injection System—Eight-Cylinder Engine
The dual air input is comprised of a belt driven air
pump, diverter valve, air control valve, divert and up
stream solenoids, reverse and two-way delay valves,
coolant temperature switch, air injection manifold,
"downstream" air injection tube and connecting hoses
(fig. 1K-10). The two air inputs into the exhaust system
are:
• upstream air injection via the air injection manifold
attached to the exhaust manifold;
• downstream air injection to the dual bed (COC and
TWC) converter.
SINGLE AIR INJECTION SYSTEM
Air Pump
The same air pump is used for both six- and eight-
cylinder engines. The major components of the air pump
are enclosed in a die-cast aluminum housing. A filter fan
assembly, rotor shaft and drive hub are visible on the
pump exterior (fig. 1K-11).