Drivetrain - Front Differential Breather Pipe Oil Leaks
No: 54/01/04/NASRef:
Issue: 1
Date: 20 August 2004
Oil Leak From Front Differential Breather Pipe
AFFECTED VEHICLE RANGE:
New Range Rover (LM)
ALL
SITUATION:
OIL LEAK FROM FRONT DIFFERENTIAL BREATHER PIPE
The customer may complain of an oil leak from under the engine bay area of the vehicle. There are a couple of potential reasons for a differential related oil leak:
^ The front differential breather pipe adaptor may be oriented in the wrong direction.
The differential may be slightly overfilled with oil.
NOTE:
The position of the filler plug in the front differential does not correspond with the fill level required to ensure component protection while avoiding oil expulsion from the breather pipe.
RESOLUTION:
ENSURE BREATHER PIPE ADAPTER IS CORRECTLY ORIENTED
Upon customer complaint of the above symptoms, follow the procedure below to confirm the correct orientation of the breather pipe adapter and ensure proper fill level in differential.
^ If the breather position is incorrect, replace the differential assembly.
^ If position is correct, drain the differential assembly and refill following the revised Workshop Manual procedure.
PARTS INFORMATION:
DDW WARRANTY CLAIMS:
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
Normal warranty policy and procedures apply. Material allowance is included in labor operation.
REPAIR PROCEDURE
INSPECT POSITION OF BREATHER PIPE
NOTE:
It is possible to confuse a camshaft cover leak with a differential breather leak. Always ensure a thorough inspection to verify the leak source.
1. Remove the acoustic cover and locate the differential breather pipe.
2. Inspect for evidence of a differential breather leak such as oil residue present around the breather pipe where it connects to the breather adaptor. (Figure 1)
3. If evidence of a differential oil leak is found, follow the check orientation - breather pipe adaptor procedure.
CHECK ORIENTATION - BREATHER PIPE ADAPTER
1. Raise the vehicle on a lift.
2. Remove the left hand front road wheel.
3. Clean area surrounding the breather pipe adapter.
NOTE:
The straight edge on the differential breather pipe adaptor must be facing towards the front of the vehicle.
4. Determine if the front differential breather pipe adapter is in the correct orientation. (Figure 1).
NOTE:
GTR lookup sequence is as follows:
GTR Home> NAS > Service Information/ LM Range Rover 2005 > Workshop Manuals > Service Procedures > Bookmark "Front Differential/Adjustments/ Drain and Refill"
CAUTION:
Lubricant must be refilled to a precisely measured volume of 750ml (25.4 oz) for refill of the front differential.
5. If the differential breather pipe adapter is in the correct orientation, drain and refill the front differential.
CAUTION:
The breather pipe adapter cannot be reoriented in the differential housing without damaging the housing.
6. If the differential breather pipe adaptor is NOT in the correct orientation, refer to GTR section 54.10.01 and perform the following:
^ Replace the front differential assembly with a new assembly.
Align differential following procedures in referenced section 54.10.03.01.
CAUTION:
Lubricant must be filled to a precisely measured volume of 800m1 (27oz) when replacing the front differential with a new assembly.
^ Fill the new front differential assembly with lubricant (LRN7591) following the revised procedure in GTR section 54.15.02.
7. If a refill was performed, disconnect the breather pipe from the front differential.
8. Blow compressed air through the disconnected breather pipe to clear any residual oil.
9. Connect the breather pipe to properly filled new or refilled differential.
10. Ensure the area is free from oil residue.
11. Install the acoustic cover.
12. Install the left hand road wheel and tighten nuts to 140 Nm (103 lbf.ft).