Jaguar AJV8 engine / 5HP24 transmission. Manual - part 1

Engine

AJ-V8/5HP24

5

Basic Engine

The AJ-V8 is an all new 90° V8 liquid cooled engine that gives refined and effortless performance.
Constructed in aluminum alloy, the AJ-V8 introduces several innovative design features new to Jaguar
engines, the most notable of these being:
•  a bedplate
•  nikasil coated cylinder bores
•  fracture split connecting rods
•  variable valve timing
•  aluminum alloy valve lifters
•  electronic throttle control.

303-056

Engine

AJ-V8/5HP24

6

ENGINE STRUCTURE

ENGINE DATA LOCATIONS

303-052

303-001

Cylinder Block

The cylinder block is an "enclosed V" design,
which provides an inherently rigid structure with
good vibration levels. Nikasil (a composition of
nickel and silicon) coated cylinder bores provide
good friction, heat transfer and piston noise
levels. A low volume coolant jacket improves
warm-up times and piston noise levels; the
longitudinal flow design of the jacket, with a
single cylinder head coolant transfer port in each
bank, improves rigidity and head gasket sealing.
The right hand cylinder bank is designated as "A"
bank, and the left hand as "B" bank. The cylinder
bores of each bank are numbered from 1 to 4,
starting from the front.
Engine data is marked at three locations on the
cylinder block. Component diameters are
represented by alphabetical and numerical codes;
keys to the codes are in the Service Manual.

1

2

3

4

1.

Cylinder Head

2.

Cylinder Block

3.

Bed Plate

4.

Structural Sump

Emissions Code

Serial Number

* Main Bearing Crankshaft
Diameters  * Connecting
Rod Bearing Crankshaft
Diameters  * Cylinder Bore
Diameters  * Main Bearing
Bore Diameters  *

Engine

AJ-V8/5HP24

7

CYLINDER BLOCK, CRANKSHAFT AND BEDPLATE

303-011

Engine

AJ-V8/5HP24

8

Bedplate

The bedplate is a structural casting bolted to the
bottom of the cylinder block to retain the
crankshaft. The use of a bedplate further
improves rigidity. Iron inserts, cast into the main
bearing supports of the bedplate, minimise main
bearing clearance changes due to heat
expansion.
Two hollow dowels align the bedplate with the
cylinder block.
Beads of sealant seal the joint between the
bedplate and the cylinder block.

Crankshaft

Six counter-balance weights ensure good
vibration levels from the four throw, five bearing
crankshaft. Manufactured in cast iron, the
crankshaft also has undercut and rolled fillets for
improved strength.
The main bearings are aluminum/tin split plain
bearings. An oil groove in the top half of each
bearing transfers oil into the crankshaft for
lubrication of the connecting rod bearings. A
lead/bronze thrust washer is installed each side of
the top half of the center main bearing.
The crankshaft rear oil seal (a lip seal similar to
that used on the AJ16 engine) is a press fit in the
bedplate to cylinder block interface.

SEALANT TRACK ON BEDPLATE

303-012

CRANKSHAFT REAR OIL SEAL

303-013