Service Instruction

NOTE: Be aware that oil leaks from above the transmission will cause oil to collect on the transmission oil pan for example engine leaks, oil cooler pipe leaks, even diesel fuel leak.

Remove the transmission undershield to gain access to the transmission area. REFER to : FRONT END BODY PANELS -- DEFENDER/L663
Using a suitable degreaser, thoroughly clean the transmission to make sure all oil contamination is removed. Refer to the Oil Leak Inspection. Make sure all relevant areas are free of oil, contamination before progressing. Make sure there is no residual oil left in bolt holes etc. If necessary, use an air blow applicator to clear and dry the bolt holes on the sump pan.
Oil Leak Inspection

If there is an oil to leak between the automatic transmission and the transfer case, this may be due to internal porosity of the automatic transmission case.

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

Due to capillary action, oil residue may be found in the joint between the transmission case and the oil pan. The potential leak path is shown in the illustration below.

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Other potential leak sources are the transmission oil cooler pipe unions. Visually inspect the areas shown in the illustration below.

NOTE: The bracket securing the transmission oil pipes has been removed to provide extra clarity.

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The potential leak path is shown in the illustration below.

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

NOTE: Leak detector spray is available to order on the JLR Electronics Parts Catalogue.
Thoroughly coat the potential leak locations using a suitable leak detector spray, refer to the illustrations above.
Run the vehicle up to operating temperature, raise the ramp and use a suitable inspection lamp to identify the source of the transmission oil leak.
Identify the source of the oil leak and take clear, in focus pictures. These may be required to support your warranty claim.
When the source of the leak has been identified, refer to the relevant technical bulletin or refer to the relevant service information and repair as necessary. If the source of the leak is not shown in the illustrations above, report using an Electronic Product Quality Report (EPQR). Make sure to attach clear, in focus pictures showing the use of leak detection spray and the exact position of the leak.