Beitrag
von Schraubaer » 16. Apr 2024, 05:41
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This is from autozone's site.
Most 1976-86 models are equipped with a Thermactor emission control system. The Thermactor emission control system makes use of a belt driven air pump to inject fresh air into the hot exhaust stream through the engine exhaust ports. The result is the extended burning of those fumes which were not completely ignited in the combustion chamber, and the subsequent reduction of the hydrocarbon and carbon monoxide content of the exhaust emissions into harmless carbon dioxide and water.
The Thermactor system is composed of the following components:
Air supply pump (belt driven)
Air control valves
Check valves
Air manifolds (internal or external)
Air supply tubes (on external manifolds only)
Air for the Thermactor system is cleaned by means of a centrifugal filter fan mounted on the air pump driveshaft. The air filter does not require a replaceable element.
To prevent excessive pressure, the air pump is equipped with a pressure relief valve which uses a replaceable plastic plug to control the pressure setting.
The pump supplies air under pressure, into the exhaust system thus lowering the exhaust emissions due to combustion. The belt driven air pump takes air in through an impeller-type centrifugal air filter fan, thus eliminating the need for a separate air filter. Dust and dirt particles cannot enter the pump because these heavier than air contaminants are thrown from the air intake by centrifugal force. The Thermactor air pump has sealed bearings which are lubricated for the life of the unit, and preset rotor vane and bearing clearances, which do not require any periodic adjustments.
The air supply from the pump is controlled by the air by-pass valve, sometimes called a dump valve. During deceleration, the air bypass valve opens, momentarily diverting the air supply through a silencer and into the atmosphere, thus preventing backfires within the exhaust system.
A check valve is incorporated in the air inlet side of the air manifolds. Its purpose is to prevent exhaust gases from backing up into the Thermactor system. This valve is especially important in the event of drive belt failure, and during deceleration, when the air by-pass valve is dumping the air supply.
The air manifolds and air supply tubes channel the air from the Thermactor air pump into the exhaust ports of each cylinder, thus completing the cycle of the Thermactor system.
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