Secondary Emission Compliant System; Secondary Air Induction System - Kohler KS530 Service Manual

Emission Compliant Systems

SECONDARY EMISSION COMPLIANT SYSTEM

Secondary Air Induction System

Secondary Air
A
Valve Assembly
For engine to be Tier III compliant, it may be fi tted 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
muffl er where it mixes with any unburned hydrocarbons,
which then burn in heat of muffl er. 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.
58
A
B
A
Hose To Exhaust
B
Manifold
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D
C
C 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.
D Inlet Screen
22 690 01 Rev. --