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Home >> Jaguar >> 2013 >> XJ Base, RWD >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission/Transaxle - RWD -- XJ/X351 >> Automatic Transmission/Transaxle - Vehicles With: 8HP70 8-Speed Automatic Transmission RWD >> Description And Operation >> Transmission Description - System Operation And Component Description (G1772593) >> Component Description >> Notes
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Component Description: Notes

The transmission comprises the main casing which houses all of the transmission components. The main casing also incorporates an integral torque converter housing.

Two variants of the casing are available to provide for the RWD (Rear Wheel Drive) and the AWD (All Wheel Drive) versions of the vehicle. The transmission internals are identical with only the output shaft being different between the two main casing types.

For AWD, refer to DESCRIPTION AND OPERATION .

A fluid pan is attached to the lower face of the main casing and is secured with bolts. The fluid pan is sealed to the main casing with a gasket. Removal of the fluid pan allows access to the Mechatronic valve block. The fluid pan has magnets located at the rear which collect any ferrous metallic particles present in the ATF (Automatic Transmission Fluid).

A fluid filter is located inside the fluid pan. If the ATF becomes contaminated or after any service work, the fluid pan with integral filter must be replaced.

The transmission does not have a Bowden cable for park lock operation. This is initiated electronically when the TCS is moved to the 'P' park position. An emergency park interlock release mechanism is provided to release the park interlock if a failure occurs. Refer to External Controls - DESCRIPTION AND OPERATION .

A feature of the 8 speed transmission is decoupling of the transmission when the vehicle is at a standstill. Normally the transmission remains in gear with the torque converter slipping and the vehicle is prevented from moving by applying the brake. The new system disengages one of the transmission clutches and only a minimum rotating load remains. This has the effect of further reducing fuel consumption.

The internal fluid pump is driven by a simplex chain and 2 drive gears from the torque converter. The fluid pump is a double stroke vane cell pump which delivers 50 cm3 of ATF per revolution.

The integral torque converter housing provides protection for the torque converter assembly and also provides the attachment for the transmission to the engine. The torque converter is a non-serviceable assembly which also contains the lock-up clutch mechanism.

The main casing contains the following major components:

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