Kohler Courage SV710 Service Manual page 50

Emission Compliant Systems
SECONDARY EMISSION COMPLIANT SYSTEM
Twin Secondary Air Induction System
Hose To Exhaust
A
Manifold
Hose To Exhaust
E
Manifold
Single Secondary Air Induction System
Secondary Air
F
Valve Assembly
For engine to be Tier III compliant, it may be fitted with a secondary air induction system (SAI).
Operation
Intake pulse of engine activates secondary air valve.
Air is drawn through an inlet screen of secondary air
valve. Air is then drawn into exhaust manifold and
muffler where it mixes with any unburned hydrocarbons,
which then burn in heat of muffler. A hose is connected
between a carburetor port and a diaphragm chamber
in secondary air valve. Carburetor vacuum moves
diaphragm to close valve when air induction is not
required, primary idle.
50
A
B
C
B Inlet Screen
F
G
Hose To Exhaust
G
Manifold
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E
D
Secondary Air
C
Valve Assembly
I
F
H Hose To Carburetor
Maintenance
Air inlet screen in secondary air valve can be removed,
cleaned, and reinstalled. If inspection of system reveals
any damage or decomposition of hoses, secondary air
valve, or exhaust system, parts should be replaced.
C
D Hose To Carburetor
H
I Inlet Screen
32 690 01 Rev. D