Jaguar XJ (X350). Manual — part 310

3 . NORMAL FOR HIGH-LIFT CAMSHAFT WITH LARGE OVERLAP: The needle will register as low as 51

kPa (15 in-Hg) but will be relatively steady. Some oscillation is normal.

4 . WORN RINGS OR DILUTED OIL: When the engine is accelerated (dotted needle), the needle drops

to 0 kPa (0 in-Hg). Upon deceleration, the needle runs slightly above 74 kPa (22 in-Hg).

5 . STICKING VALVES: When the needle (dotted) remains steady at a normal vacuum but occasionally

flicks (sharp, fast movement) down and back about 13 kPa (4 in-Hg), one or more valves may be

sticking.

6 . BURNED OR BENT VALVES: A regular, evenly-spaced, downscale flicking of the needle indicates

one or more burned or damaged valves. Insufficient hydraulic valve tappet or hydraulic lash adjuster

clearance will also cause this reaction.

7 . POOR VALVE SEATING: A small but regular downscale flicking can mean one or more valves are

not seating correctly.

8 . WORN VALVE GUIDES: When the needle oscillates over about a 13 kPa (4 in-Hg) range at idle

speed, the valve guides could be worn. As engine speed increases, the needle will become steady if

guides are responsible.

9 . WEAK VALVE SPRINGS: When the needle oscillation becomes more violent as engine RPM is

increased, weak valve springs are indicated. The reading at idle could be relatively steady.

10 . LATE VALVE TIMING: A steady but low reading could be caused by late valve timing.

11 . IGNITION TIMING RETARDING: Retarded ignition timing will produce a steady but somewhat low

reading.

12 . INSUFFICIENT SPARK PLUG GAP: When spark plugs are gapped too close, a regular, small

pulsation of the needle can occur.

13 . INTAKE LEAK: A low, steady reading can be caused by an intake manifold or throttle body gasket

leak.

14 . BLOWN HEAD GASKET: A regular drop of fair magnitude can be caused by a blown head gasket

or warped cylinder head to cylinder block surface.

15 . RESTRICTED EXHAUST SYSTEM: When the engine is first started and is idled, the reading may be

normal, but as the engine RPM is increased, the back pressure caused by a clogged muffler, kinked

tail pipe or other concerns will cause the needle to slowly drop to 0 kPa (0 in-Hg). The needle then

may slowly rise. Excessive exhaust clogging will cause the needle to drop to a low point even if the

engine is only idling.

When vacuum leaks are indicated, search out and correct the cause. Excess air leaking into the

system will upset the fuel mixture and cause concerns such as rough idle, missing on acceleration or

burned valves. If the leak exists in an accessory such as the power brake booster, the unit will not

function correctly. Always repair vacuum leaks.

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Engine - 2.7L Diesel

No data

303-01A : Engine – 3.0L

Specifications

Specifications

Lubricants, Fluids, Sealers and Adhesives

Description

Specification

Engine oil (EUROPE), SAE 5W-30 WSS-M2C-913A or B

Engine oil (US), SAE 5W-30

ILSAC GF3, API SJ

Engine assembly lubricant

SQM-2C9003 AA EP90

Sealant

WSS M4G 320-A3

Hose assembly surfactant

ESE-M99 B144-B

Capacities

Description

Liters

Engine oil, initial fill

7.0

Engine oil, service fill with oil filter change 6.5

Torque Specifications

Description

Nm

lb-ft

lb-in

Accessory drive belt idler pulley retaining bolt

25

18

-

Accessory drive belt tensioner retaining bolt

48

35

Air conditioning (A/C) compressor retaining bolts

25

18

-

A/C compressor mounting bracket retaining bolts

25

18

-

A/C compressor lines retaining bolts

9

-

80

Camshaft bearing caps retaining bolts

A

-

-

Camshaft position sensor retaining bolt

7

-

62

Connecting rod cap retaining bolts

A

-

-

Coolant by-pass tube to cylinder head retaining bolts

10

7

-

Crankshaft position sensor retaining bolt

10

7

-

Crankshaft pulley retaining bolt

A

-

-

Cylinder head retaining bolts

A

-

-

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