The 2008 Jeep Cherokee gets a New 2.8 CRD Diesel Engine

The Jeep Cherokee is only available with a new 2.8-litre DOHC 16-valve common-rail turbo diesel engine. With its Variable Geometry Turbocharger (VGT) and rapid throttle response, this engine enables the Cherokee to claim best-in-class torque of 460 Nm (339 lb.-ft.) at 2,000 rpm with the five-speed automatic transmission, and best-in-class towing capacity of up to 2,800 kilograms and a driving range of 450 miles. Maximum power is 130 kW (174 bhp DIN) at 3,800 rpm.

The new 2.8-litre CRD engine also provides a weight saving of approximately six per cent, achieves increased cam belt life (durability now of 140,000 kilometres) and features Piezo fuel injectors and a 2000-bar fuel system to improve fuel-system speed and control.

A forged steel crankshaft now features eight counterweights compared to the prior crankshaft which had four. A structural oil pan assists in reducing noise, vibration and harshness on the new engine.

The VGT now has an electronically controlled actuator as opposed to a pneumatic actuator on the previous engine. This provides improved cold launch performance, and it also allows the turbocharger to spool up faster from idle, minimising turbo lag and providing good low-end and high-end torque.

Manual and Automatic Transmissions

There are two transmissions offered on the Jeep Cherokee – a six-speed manual or a five-speed automatic.

The six-speed manual transmission provides optimal shift quality, quiet operation and high quality. All ratios are synchronised, including Reverse. Short throws are accompanied by low shift efforts through the use of multiple-cone synchronisers on First through Fourth gears, triple cones on First and Second gear, and double cones on Third and Fourth. The 3-4 synchroniser mounts with the cluster gear on the countershaft to minimise shift effort by lowering inertia. State-of-the-art synchroniser materials ensure a constant coefficient of friction throughout the service life with high-wear resistance. For precise shifting, a multi-rail shift system is used. Hard-finished gears allow for quiet operation. The two-piece aluminium case with integrated clutch housing contributes to powertrain stiffness and light weight.

The Jeep Cherokee is also available with the W5A580 five-speed automatic transmission. It is shared with the Jeep Grand Cherokee and improvements include quieter operation.

Published 5 August 2008 Melanie Carter

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