LEMON Manuals: Even more car manuals for everyone
Home >> Jaguar >> 2017 >> XJR L >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Automatic Transmission/Transaxle - AWD -- XJ/X351) >> Description And Operation >> System Operation And Component Description (G1772596) >> Component Description >> Transmission Main Casing

Transmission Main Casing

WARNING: This page is about a different car, the 2017 Jaguar XJ, 2016 Jaguar XJ, 2015 Jaguar XJ, 2014 Jaguar XJ, and 2013 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.

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. Refer to: AUTOMATIC TRANSMISSION/TRANSAXLE - VEHICLES WITH: 8HP70 8-SPEED AUTOMATIC TRANSMISSION RWD -- XJ/X351 (307-01B) (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 - COMPONENT LOCATION (G1772597) (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:

scientia non olet · About LEMON Manuals