Dodge RAM TRUCK 1500 1995 Service Manual page 1713

B R
EiiSSiON CONIiOl SYSTEMS 25-15
A I R
I N J E C T I O N
S Y S T E M — H O C - G A S
E N G I N E S
U D E X
page page
Air Injection Pump 16 One-Way Check Valve . 17
General Information . . 1 5
GEIERAL HFORMATlOl
The air injection system (Fig. 23, 24 and 25) is
used on the 5.9L V-8 and 8.0L V-10 heavy duty cycle
(HDC) gas powered engines only. The air injection
system consists of:
• A belt-driven air injection (AIR) pump
• An air pressure relief valve
• Rubber connecting air injection hoses with clamps
• Metal connecting air tubes
• Two one-way check valves
• An injection pump air filter (8.0L V-10 engine
only)
OPEilliON
The air injection system adds a controlled amount
of air to the exhaust gases aiding oxidation of hydro­
carbons and carbon monoxide in the exhaust stream.
The system does not interfere with the ability of the
EGR system to control nitrous oxide (NOx) emis­
sions.
§.pL HDC ENGINE: Air is drawn into the pump
through a rubber tube that is connected to a fitting
on the air cleaner housing (Fig. 24).
8.0L V-10 ENGINE: Air is drawn into the pump
through a rubber tube that is connected to a fitting
on the air injection pump filter housing (Fig. 25). Air
is drawn into the filter housing from the front of the
vehicle with rubber tube. This tube is used as a si­
lencer to help prevent air intake noise at the opening
to the pump filter housing. An air filter is located
within the air pump filter housing (Fig. 25).
Air is then compressed by the air injector pump. It
is expelled from the pump and routed into a rubber
tube where it reaches the air pressure relief valve
Fig. 23 Air Injection System Components—Typical
J9425-17