Jaguar XJ (X350). Manual — part 769

303-08A : Engine Emission Control – 4.2L NA V8 –

AJV8/4.2L SC V8 – AJV8/3.0L NA V6 – AJ27/3.5L NA V8

– AJV8

Specifications

Specifications

Torque Specifications

Description

Nm lb-ft lb-in

Exhaust gas recirculation (EGR) valve to intake manifold retaining bolts 10 7

-

EGR valve tube to EGR valve retaining bolts

21 15 -

Exhaust manifold to EGR valve tube retaining nuts

21 15 -

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Specifications

Torque Specifications

Description

Nm

lb-
ft

lb-
in

Exhaust gas recirculation (EGR) valve to intake manifold retaining bolts -
Vehicles with 3.5L or 4.2L engine

10 7

-

EGR valve tube to EGR valve retaining bolts - Vehicles with 3.5L or 4.2L
engine

21 15 -

Exhaust manifold to EGR valve tube retaining nuts - Vehicles with 3.5L or
4.2L engine

21 15 -

Secondary air injection (AIR) control valve to exhaust manifold tube retaining
nuts

35 26 -

AIR control valve to exhaust manifold tube to exhaust manifold adaptor

35 26 -

Exhaust manifold blanking plug - Vehicles without AIR

35 26 -

AIR control valve bracket retaining bolt - Vehicles with 3.0L engine

8

-

71

AIR control valve bracket retaining nut - Vehicles with 3.0L engine

8

-

71

AIR control valve retaining bolts - Vehicles with 3.5L or 4.2L engine

25 18 -

AIR pump retaining nuts

20 15 -

AIR vacuum reservoir retaining nut

5

-

44

AIR vacuum reservoir retaining bolt

5

-

44

Description and operation

Engine Emission Control - VIN Range:
G00442->G45703

Positive Crankcase Ventilation System

Vehicles fitted with 3.5L or 4.2L engine

On vehicles fitted with a 3.5L or 4.2L engine the positive crankcase ventilation (PCV) system consists

of a PCV valve, and two PCV hoses. The PCV valve is mounted on the right-hand valve cover and a

hose is connected between PCV valve and the throttle body elbow. The PCV valve regulates the

amount of ventilation air and crankcase gas supplied to the intake manifold and also prevents

backfiring into the crankcase. The left-hand valve cover PCV hose is connected to the air cleaner

outlet pipe.

Vehicles fitted with 3.0L engine

On vehicles fitted with 3.0L engine the PCV system consists of two hoses, connected between the

left-hand valve cover and the intake manifold and the right-hand valve cover and the air cleaner

outlet pipe.

The PCV system recycles crankcase gases back through the engine where they mix with incoming

air/fuel charge.

The positive crankcase ventilation system helps to reduce hydrocarbon emissions from the engine.

Exhaust Gas Recirculation System

Exhaust Gas Recirculation (EGR) Valve

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