1999 JAGUAR S TYPE light

V6 EngineAJ-V6/AJ28
39
D.303.1351D.303.1352
PAS PUMPA/C COMPRESSOR
D.303.1352
D.303.1369
Idler Pulleys
Two idler pulleys are used, one fixed by a single
bolt to the front cover and a second (see
illustration) fixed via a mounting bracket to the
upper RH side of the cylinder head and front
cover.
PAS Pump
The PAS pump is fixed by a single bolt to the LH
cylinder head and by two bolts to the front cover.
The pulley is constructed of lightweight phenolic
material.
Air Conditioning Compressor
The A/C compressor is mounted on the lower LH
side of the engine and is secured by two bolts to a
bracket fixed to the bedplate and by two lower
bolts directly to the oil sump.IDLER PULLEY
D.303.1351
D.303.1369

V6 Engine AJ-V6/AJ28
40
Engine Management Sensors
Key to illustration on page 41:
1. Throttle motor
2. TP sensor
3. IAT sensor
4. MAF sensor
5. Top IMT valve
6. Bottom IMT valve
7. EFT sensor
8. IP sensor
9. Fuel injectors
10. Coil-on-plug units
11. VVT shuttle valve
12. CMP sensor
13. CHT sensor
14. KS sensors
15. EOT sensor
16. CKP sensor
17. HO2 sensors
18. HO2 sensors (catalyst monitors)
Cylinder Head Temperature (CHT) Sensor
The single CHT sensor is located between the two
rear coil-on-plug units in the bank 2 cylinder
head. The sensor directly monitors the metal
temperature of the cylinder head. This method of
engine heat sensing is used in place of a
conventional coolant temperature sensor to
enable the fail safe cooling strategy to operate.
The use of a metal temperature sensor allows
cylinder head temperature to be measured even if
coolant has been lost unlike an ECT sensor which
would produce inaccurate temperature
indications, eg measuring steam temperature.
Crankshaft Position (CKP) Sensor
Crankshaft position and rotational speed are
sensed from a steel timing ring keyed to the front
end of the crankshaft immediately behind the
front cover. The timing ring has 36-1 teeth, ie one
missing tooth, which are angled slightly forward
and bent at rightangles to provide a sensing area
for the inductive sensor. The sensor is positioned
in the front cover, to the side of the crankshaft
damper, at approximately 20û to the plane of the
timing ring.
D.303.1342
J.303.1343
CHT SENSOR
CKP SENSOR
D.303-1342
J.303-1343
Engine management sensors and actuators (but
not off engine sensors) are summarised in the
illustration on page 41 and are also described
below or in the relevant section (VVT, fuel system,
throttle, tuned manifold).
The engine management system is described in a
separate section.

J.303.1318
V8 Engine AJ-V6/AJ28
48
Exhaust Manifold
The exhaust manifolds have a double wall
construction and are manufactured from
austenitic stainless steel. The double wall
construction has a number of advantages:
¥ it provides a significant reduction in the
external heat generated and therefore
improves underhood thermal management
¥ a heat shield is not required
¥ the durability of the manifold is increased (eg
less likely to crack)
¥ by retaining heat, the insulation effect
provides a slight improvement in the time to
catalyst light-off.
The manifold couples to the catalytic converter
via a spherical joint which requires no gasket or
sealant. EXHAUST MANIFOLD
J.303.1318

Introduction
Manual Transmission AJ-V6/AJ28
64In Europeon markets only, manual transmission is fitted as standard on the V6 entry S-TYPE model and
as an option on the V6 high specification model. Manual transmission is not available for the V8 variant.
The manual transmission is a 5 speed Getrag 221 unit with the following features:
¥ direct gearing (1:1) on 5th gear (it is normally on 4th) reduces losses
¥ twin synchronising cones on 1st and 2nd gears provide a smoother change
¥ four plane shift gate (R-1-3-5) with Ôknock-overÕ protection on the Reverse position.
A reverse light switch and speed sensor are fitted on the LH side of the gearbox. The speed sensor
monitors output shaft speed to provide an input to the PCM in addition to the signals received from the
road wheel speed sensors.
Specification:
Gear ratios: 1st 2nd 3rd 4th 5th Reverse
4.23 : 1 2.52 : 1 1.67 : 1 1.22 : 1 1 : 1 4.14 : 1
Weight: 33 kg (72 lbs)
Oil specification: ESSOD21065
Oil change interval: 60,000 miles (96,000 km)
D.307.312
MANUAL TRANSMISSION, CLUTCH ASSEMBLY AND DUAL MASS FLYWHEEL
D.307.312
Reverse Light Switch
Speed Sensor