Emission control systems

EMISSION CONTROL SYSTEMS

The vehicle is fitted with various emission and evaporative control components to comply with emission regulation requirements.

The following control systems are used to reduce harmful emissions released into the atmosphere from the vehicle at all times, and under all conditions:

1. Crankcase emission control
2. Exhaust emission control
3. Fuel vapour evaporative loss control (’K’ series models)

In many countries it is against the law for a vehicle owner or an unauthorised repair shop to modify or tamper with emission control equipment. In this event the vehicle owner and/or the repairer may be liable for prosecution.

The emission control system fitted to the vehicle is designed to keep the emissions within the legal limits provided that the engine is correctly maintained and is in good mechanical condition.

Crankcase emission control system - ’K’ series

Gases from the crankcase are drawn into throttle housing to be burnt in the combustion chambers with the fuel mixture. The system provides effective emission control under all circumstances while the engine is running.

Clean air is drawn into the crankcase through a pipe connected to the air cleaner side of the throttle housing. Crankcase gases and clean air are then drawn via a pipe, through a filter in the camshaft cover, into the manifold side of the throttle housing and consumed in the combustion chambers. This pipe incorporates a restrictor to prevent engine oil being drawn into the inlet manifold by the substantially greater manifold depression.

Crankcase emission control system - ’L’ series

Gases from the crankcase are drawn into the inlet manifold to be burnt in the combustion chambers with the fuel mixture. The system provides effective emission control under all circumstances while the engine is running.

Crankcase gases are drawn from the camshaft cover into the turbocharger intake via a depression limiting valve (crankcase pressure limiter valve). The valve closes progressively as engine speed increases, so limiting the maximum depression in the crankcase.