Jaguar Technical Guide: AJ-V8 Engine & 5HP24 Transmission

Jaguar Technical Guide: AJ-V8 Engine & 5HP24 Transmission PDF. This Technical Guide introduces the new AJ V8 engine and 5HP24 transmission installed in the XK8 Sports car. It is intended to give Jaguar Dealer workshop personnel an overview of their construction and operation, and is for information purposes only. The contents of this Technical Guide must not be used as a reference source for servicing procedures; all servicing procedures must be in accordance with the appropriate Service Manual.

This Technical Guide will not be updated. While every effort is made to ensure accuracy, changes may occur between going to press and the equipment being introduced to the market. Once the equipment is in service, details of changes can be obtained from Service Bulletins and revisions to the Service Manuals.

The AJ-V8 4.0 litre, engine is the first of a new family of Jaguar engines. Designed to give excellent performance, refinement, economy and low vibration levels it also conforms to the strictest emission legislation. Weighing only 200 kilograms (441 lb), the engine is shorter by 12 inches (300 mm) than the current AJ16 4.0 litre engine. Compression ratio is 10.75:1, with four valves per cylinder.

The cylinder heads, block and bedplate are all cast aluminum. Cylinders have electro-plated bores which reduce piston friction, improve warm-up and oil retention. A variable valve timing system has been introduced to give improved low and high-speed engine performance and excellent idle quality.

The valve gear is chain driven for durability. Low valve overlap improves engine idle speed and low residual fuel levels which improves combustion and reduces hydrocarbon emissions. The inlet manifold is a one-piece, composite moulding with integral fuel rails connecting to the eight side feed fuel injectors. Air flow into the engine is via an electronic throttle assembly. Movement of the throttle is controlled by sensors in the throttle assembly through the ECM.

The engine has a low volume, high velocity, cooling system which achieves a very fast warm-up with reduced and even metal temperatures in the combustion chamber and increased bore temperatures.

The generator, A/C pump, and PAS pump are mounted to the cylinder block on rigid cradle supports. Accessory drive is from a single, 7-ribbed vee belt. Hydraulic engine mounts minimise noise and vibration.

A new engine management system adjusts fuel and ignition settings, monitors and controls exhaust emissions and provides an on-board diagnostic capability.

The transmission is a new ZF 5-speed, automatic, electronically controlled unit. The unit is oil filled for life so does not have an oil gauge (dipstick). Two driver selected modes are available, sport or normal. The TCM is programmed with cruise, traction, gradient, warm-up and hot mode features. It also provides an on-board diagnostic capability.

The engine and transmission meet OBDII USA environmental regulations. Default limp home modes for both engine and transmission are provided.


  • Glossary
    • Abbreviations
  • Introduction
  • Engine
    • Basic Engine
    • Engine Cooling
    • Engine Lubrication
    • Variable Valve Timing
    • Air Intake System
    • Fuel System
    • Ignition System
    • Crankcase Ventilation
    • EGR System
    • Engine Accessories
    • Accessory Drive
    • Engine Harness
    • Engine Covers
    • Engine Specifications
  • Engine Management
    • ECM
    • Electronic Throttle
    • Fuel Pump
    • Fuel Injection
    • Ignition
    • EVAP System
    • Variable Valve Timing
    • EGR System
    • Engine Starting
    • HO2S Heaters
    • Instrument Cluster
    • A/C Compressor Clutch
    • Windshield and Backlight Heaters
    • Radiator Cooling Fans
    • Diagnostics
  • Transmission
    • Introduction
    • Technical Data
    • Gearshifting
    • Mechanical Description
    • Electrical Description
  • Transmission Management
    • Transmission Management
  • Service Tools
    • New Tools

Language: English
Format: PDF
Pages: 77

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