Jaguar AJV8 engine / 5HP24 transmission. Service manual - part 3

Engine

AJ-V8/5HP24

13

303-016 / 017

Primary Chain
Tensioner

Secondary Chain
Tensioner

Secondary
Chain

Variable Valve
Timing Unit

Primary Chain

TIMING GEAR

Engine

AJ-V8/5HP24

14

A key locates the two drive sprockets on the
crankshaft. The crankshaft's torsional vibration
damper retains the sprockets in position.
The variable valve timing units and the exhaust
camshaft sprockets are non-interference, non-
keyed fits on their respective camshafts; the
drive being transmitted by the face to face
friction load produced by the valve timing
unit/sprocket securing bolt.
Each chain has an hydraulic tensioner operated
by engine oil. A jet of oil from the end of each
tensioner lubricates the chains. The primary chain
tensioners act on pivoting flexible tensioner
blades. The secondary chain tensioners act
directly on the chains. Guide rails are installed on
the drive side of the primary chains.

Timing Cover

The aluminum alloy timing cover accommodates
the crankshaft front oil seal (a PTFE lip seal) and
the two variable valve timing solenoids. Silicon
rubber in-groove gaskets seal the joint between
the timing cover and the front face of the engine.

TIMING COVER

Crankshaft
Front Oil
Seal

303-015

Timing Gear (Continued)

Variable Valve
Timing Solenoid

Engine

AJ-V8/5HP24

15

Camshaft Covers

The camshaft covers are manufactured from vinyl
ester composite. The A bank camshaft cover
incorporates an outlet for the full load engine
breather. The B bank camshaft cover incorporates
the engine oil filler cap and an outlet for the part
load engine breather. Identical oil separators are
incorporated below the breather outlet in each
cover (see Crankcase Ventilation, page 35).
Silicon rubber in-groove gaskets seal the joints
between the camshaft covers and the cylinder
heads. Together with spacers and seals on the
camshaft cover fasteners, they also isolate the
covers from direct contact with the cylinder
heads, to reduce noise.

B BANK CAMSHAFT COVER

303-042

Engine

AJ-V8/5HP24

16

Exhaust Manifold

The thin-wall cast iron manifolds are unique for
each cylinder bank. On engines with EGR, the A
bank manifold has a connection for the transfer
pipe.
Spacers on the securing bolts allow the
manifolds to expand and retract with changes of
temperature while maintaining the clamping
loads.
Heat shields are integrated into the exhaust
manifold gaskets.

EXHAUST MANIFOLD

303-023