Jaguar XJ (X350). Manual — part 518

The right hand exhaust camshaft drives the vacuum pump which is sealed by an O-ring seal and

secured by three bolts. Both inlet camshafts are sealed at each end by the inlet manifold/cam cover.

The vacuum pump supplies vacuum for the inlet port deactuation system and brake servo assistance.

The pump is located at the rear of the engine and driven by the right hand side exhaust camshaft.

High Pressure Pump

The left hand exhaust camshaft drives the high pressure pump by means of a belt drive sprocket,

which is supported by a boss and a single bolt fixing.

The high pressure pump is not timed to the engine.

Timing Gear

The camshafts are driven from the crankshaft pulley via a timing belt to the front the of exhaust

camshafts. The camshaft gears are bolted to a drive flange via three elongated adjustment holes and

in turn bolted to the camshafts by a single bolt.

Each pair of camshafts are chain driven and must be timed before assembly.

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Sump Pan

The sump pan is made from pressed steel and is secured to the bedplate by 21 M6 x 16 bolts.

Item

Part Number

Description

1

—

Gasket

2

—

Draining bolt seal

3

—

Draining bolt

4

—

Sump pan

5

—

Retaining bolts

Engine Lubrication System

Oil is drawn from the oil pan and pressurised by the oil pump. The output from the oil pump is then

filtered and distributed through the internal passage ways. Oil is cooled before entering the filter.

All moving parts are lubricated by pressure or splash oil. Pressurised oil is also provided for operation

of the hydraulic adjusters, turbochargers and timing gear chain tensioners.

The engine is lubricated by a forced-feed circulation system with full flow oil filter. The oil cooler

forms a unit with the oil filter and fuel cooler which is mounted centrally in the cylinder block

between the two banks of cylinders. The engine oil is cooled using the engine cooling system. This

eliminates the need for an additional engine oil cooler remotely mounted.

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