Jaguar XJ (X350). Manual — part 788

5 . Remove the secondary air pump.

Installation

1 . To install, reverse the removal procedure.

Tighten to 20 Nm.

2

.

NOTE:

For NAS vehicles only.

If required, carry out a short drive cycle.

For additional information, refer to Powertrain Control Module (PCM) Short Drive Cycle Self-

Test

303-08B : Engine Emission Control – 2.7L V6 – TdV6

Specifications

Specifications

Torque Specifications

Description

Nm lb-ft lb-in

Exhaust gas recirculation (EGR) valve to cylinder head retaining bolts 10 –

89

EGR valve to EGR cooler retaining bolts

10 –

89

EGR valve tube to exhaust manifold retaining bolts

10 –

89

EGR valve cooler mounting bracket retaining bolt

10 –

89

EGR valve outlet tube to EGR valve retaining bolts

10 –

89

EGR valve outlet tube to timing cover retaining bolt

5

–

44

Fuel filter mounting bracket retaining 10 mm bolt

25 18 –

Fuel filter mounting bracket retaining 6 mm bolt

10 –

89

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Description and operation

Engine Emission Control

Crankcase Ventilation

The crankcase ventilation system on the 2.7L Diesel ensures that all gases emitted from the

crankcase during engine running are separated from any oil particles.

Item

Part Number

Description

1

Left-hand breather tube

2

Crankcase vent oil seperator

3

Right-hand breather tube

4

Crankcase oil return tube

5

Crankcase oil return valve

6

Oil return tube

Crankcase ventilation is by a cyclone seperator. The oil seperator is constructed from a plastic

composite material. The oil seperator is located between the ‘V’ at the back of the engine block by

means of three seals. The oil seperator contains a diaphragm and spring which opens under intake

vacuum.

The ventilation systems first chamber is a horizontal void cavity fed by eight points. Once primary

separation is complete, the partially cleaned vapor is sucked through a cyclone where the process

further reduces the oil content. Prior to the vapor entering the air supply at the compressor, a

diaphragm pressure balance valve operates to minimize the crankcase pressure variations caused by

engine air demand and service condition.

Due to the shape and design of the cyclone unit, the oil and vapor are seperated more effectively.

Vapor is directed into the inlet system and the heavier oil drains back into the engine.

Exhaust Emission Control

The exhaust of a diesel engine contains the following pollutants:

Carbon Monoxide (CO)

Hydrocarbons (HC)

Particulates

Oxides of Nitrogen (NOx)

These pollutants are primarily produced as a result of incomplete combustion of the fuel.

The particulates in the exhaust gases consist of pure carbon and various compounds such as metal

oxide and sulphur.

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