Emission control - Td4 (Description): Description and operation

Description

General

The vehicle is fitted with the following control systems to reduce emissions released into the atmosphere: l Crankcase emission control. l Exhaust gas recirculation. l Exhaust emission control.

CAUTION: In many countries it is against the law for a vehicle owner or an unauthorised dealer to modify or tamper with emission control equipment. In some cases, the vehicle owner and/or the dealer may even be liable for prosecution.

The emission control systems fitted to the vehicle are designed to keep the emissions within the legal limits, at the time of manufacture, provided that the engine is correctly maintained and is in good mechanical condition.

Crankcase Emission Control

Crankcase emissions are vented into the turbocharger inlet duct via a depression limiter valve installed on the camshaft cover. A dedicated bore in the cylinder block and cylinder head connect the crankcase to the inlet of the depression limiter valve. The outlet of the depression limiter valve is connected to the turbocharger inlet duct by a passageway integrated into the camshaft cover and a tube between the camshaft cover and the inlet duct.

Depression Limiter Valve

1 Ambient pressure vent 2 Cap 3 Diaphragm valve 4 Integral passageway 5 Housing

6 Locating arm 7 Oil separator 8 'O' ring 9 Spring