V6 Engine
8
Cylinder Head
The aluminium alloy cylinder heads have square
squish combustion chambers with four valve
ports and a central spark plug. Each head is
aligned to the cylinder block via two split hollow
dowels and sealed with a composite stainless steel
gasket. Steel balls (10.11mm diameter) are used
to plug the external bores of the oilway drillings
and cup plugs are fitted to the water jacket
openings. Two half round aluminium cap inserts
are fitted via a sealant at the rear of the head.
Cam Cover
The cylinder heads are fitted with lightweight
polyester cam covers, (bank 2 is silver colored)
with silicone seals, to save weight and reduce
airborne noise. A central aperture allows access to
the coil on plug units and a second hole has a
grommet through which the VVT oil control valve
protrudes. The oil filler hole is in the LH cover.
D.303.1368
CYLINDER HEAD
D.303.1207
CAM COVER
D.303.1207
Cylinder Head Assembly
D.303.1368
AJ-V6/AJ28
Ignition System
V6 Engine AJ-V6/AJ28
30cylinder heads and the upper intake manifold
assembly.
The injectors are of the top fed, split spray type
and are supplied from a common fuel rail
assembly which bolts to the lower manifold. The
integral fuel rail consists of an upper delivery pipe
and a lower pipe with six takeoff feeds for the
injectors. The IP sensor is bolted to a flange at the
junction of the two pipes and has an electrical
connection to the fuel rail harness and a vacuum
feed from the intake manifold. A steel cross-over
pipe provides the coupling to the vehicle
mounted fuel line and also carries the EFT sensor,
on a bracket, and the de-pressurisation valve. The
cross-over pipe is connected to the fuel rail via a
semi-rigid length of pipe.
All fuel injectors and sensors use a common
electrical harness with a single multi-way
connection to the main engine harness.
Six coil-on-plug ignition units fit directly on to the
spark plugs. The ignition units are driven by the
PCM and do not contain integral amplifiers.
D.303.1206D.303.1206
COIL-ON-PLUG UNITS
