3.10
ENGINE
Emissions Secondary Air System
The secondary air system is located on the upper rear cab support and engine. This system introduces air into the exhaust system
for more complete burning of the exhaust emissions. The air control valve (A) is operated by intake manifold pulses from the intake
manifold, which releases the air to the one-way valve (B) to combine with the pull of the exhaust gas stream from the cylinder head.
Check the air control valve (A), one-way valve (B), filter housing (C) and related components according to the maintenance schedule
in Chapter 2 for proper operation and emissions compliance.
A
B
C
Air To Cylinder Head Exhaust Passage
To Intake (impulse)
Air In
7-8 ft. lbs. (9-11 Nm)
16 ft. lbs. (22 Nm)
7-8 ft. lbs. (9-11 Nm)
7-8 ft. lbs. (9-11 Nm)
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