Jaguar AJV8 engine / 5HP24 transmission. Manual - part 5

Engine

AJ-V8/5HP24

21

LUBRICATION SYSTEM

8

7

6

5

1.

Valve Lifter Supply

2.

Main Bearing Supply

3.

Connecting Rod Bearing Supply

4.

Bedplate/Cylinder Block Interface

5.

Oil Pick-up

6.

Pressure Relief Valve

7.

Oil Pressure Switch

8.

Oil Filter

9.

Structural Sump/Bedplate Interface

10. Bedplate/Cylinder Block Interface
11. Oil Pump
12. Primary Chain Tensioner Supply
13. Cylinder Block/Cylinder Head Interface
14. Variable Valve Timing Supply
15. Camshaft Bearing Supply
16. Secondary Chain Tensioner Supply

303-007

12

14

15

2

11

3

1

13

16

10

9

4

Engine

AJ-V8/5HP24

22

Oil Pump

The oil pump is installed on the crankshaft at the
front of the engine. The pump inlet and outlet
ports align with oil passages in the bedplate. A
rubber coated metal gasket seals the pump to
bedplate interface.
The pumping element is an eccentric rotor, which
is directly driven by flats on the crankshaft. An
integral pressure relief valve regulates pump
outlet pressure at 4.5 bar (65.25 psi).

Oil Filter

The oil filter is a replaceable cartridge installed on
an adapter. An internal bypass facility permits full
flow bypass if the filter is blocked.

Oil Pressure Switch

The oil pressure switch connects a ground input
to the instrument cluster when oil pressure is
present. The switch operates at a pressure of
0.15 to 0.41 bar (2.2 to 5.9 psi).

Oil Level Gauge

The oil level gauge locates midway along the left
side of the oil pan, supported in a tube installed in
the bedplate. Two holes in the end of the gauge
indicate the minimum and maximum oil levels.
There is a difference of approximately 1 liter
(1 US quart) between the two levels.

OIL LEVEL GAUGE

303-022

OIL PUMP

303-009

Oil Pick-up

The moulded composite oil pick-up is immersed
in the oil reservoir to provide a supply to the oil
pump during all normal vehicle attitudes. The
castellated inlet allows the supply to be
maintained even if the sump pan is deformed (eg.
by “grounding”). A mesh screen in the inlet
prevents debris from entering the oil system.

Engine

AJ-V8/5HP24

OIL SYSTEM COMPONENTS ON STRUCTURAL SUMP

Pressure Switch

Pick-up

Filter

303-185

Engine

AJ-V8/5HP24

24

Variable Valve Timing

The variable valve timing system improves low
and high speed engine performance, engine idle
quality and exhaust emission. It is a two position
system that operates on the intake camshafts
only. There are 30° of crankshaft movement
between the retarded and advanced positions.
Engine oil pressure operates the system under
the control of the ECM.
For each intake camshaft there is a valve timing
unit, a bush carrier assembly and a valve timing
solenoid.

Valve Timing Unit

The valve timing unit turns the intake camshaft in
relation to the primary chain to advance and
retard the timing.
The unit consists of a body and sprocket
assembly separated from an inner sleeve by a
ring piston and two ring gears. A bolt secures the
inner sleeve to the camshaft. The ring gears
engage in opposing helical splines on the body
and sprocket assembly and on the inner sleeve.
The ring gears transmit the drive from the body

and sprocket assembly to the inner sleeve and,
when moved axially, turn the inner sleeve in
relation to the body and sprocket assembly.
Engine oil pressure (controlled by the valve timing
solenoid) moves the ring gears and piston to turn
the inner sleeve in the advanced timing direction.
A return spring moves the ring gears and piston
to turn the inner sleeve in the retarded timing
direction.
Additional springs absorb backlash to reduce
noise and wear. The springs between the ring
gears absorb rotational backlash. The spring
between the inner sleeve and the end of the
body and sprocket assembly absorbs axial
backlash.

Retarded

Advanced

TDC

Intake

Exhaust

BDC

Exhaust

TDC

Intake

BDC

35°

5°

10°

10°

25°

5°

VALVE TIMING DIAGRAMS

65°

50°

35°

50°

303-068