Engine - Oil Leaks From Rear
No: 12/02/02/NASRef: 12/01/02/NAS
Issue: 1
Date: 10/11/02
New Style "Crucifix" Seals
AFFECTED VEHICLE RANGE:
Land Rover V-8
Range Rover Classic (LH) All
Range Rover (LP) All
Discovery (LJ) All
Defender (LD) All
Discovery Series II (LT) All
SITUATION:
OIL LEAKAGE FROM REAR MAIN BEARING AREA
The customer may complain of oil leakage at the rear of the engine. Several seal areas can contribute to oil seepage in this location.
^ Leak from the rear main bearing cap side seals.
^ Leak from the rear main bearing cap sealant area.
^ Leak from the crankshaft rear oil seal.
In addition the rear camshaft oil galley and bore plugs can contribute to oil seepage. Refer to TIB 12/01/02/NAS for additional information.
RESOLUTION:
NEW STYLE BEARING SIDE CAP (CRUCIFIX) SEALS INTRODUCED
Where a complaint of an oil leak from the above listed area is confirmed, replace the rear main bearing cap side seals with the new rear main bearing cap side seals now used in production. As part of the replacement of the side seals the crankshaft rear oil seal should also be replaced and the rear cam galley and bore plugs inspected for seepage.
PARTS INFORMATION
WARRANTY CLAIMS
Normal warranty policy and procedures apply. Material allowance is included in labor operation.
REPAIR PROCEDURE
INSTALL NEW SIDE SEALS
1. Refer to the Workshop Manual section 12.53.13 and remove the torque converter drive plate or flywheel.
2. Refer to Workshop Manual section 12.60.38 and remove the sump.
3. Refer to Workshop Manual, section 86.60.01 and remove the starter motor.
4. Remove Allen side bolts from the rear main bearing cap.
5. Remove the rear main bearing cap bolts, main bearing cap and crankshaft oil seal.
6. Remove the side seals from the main bearing cap.
7. Carefully remove any residue sealant from the main bearing cap to cylinder block mating surfaces.
8. Ensure seal locations and mating surfaces in the main bearing cap and cylinder block are clean.
CAUTION:
The main bearing cap bolt holes in the cylinder block must be clean and dry.
9. Clean cap bolt holes and verify they are dry.
10. Fit new side seals (LUN000010) to the main bearing cap. (Arrowed in Figure 1)
CAUTION:
Ensure sealant does not enter the cylinder block bolt holes.
11. Apply a 3 mm (1/8 in) wide bead of STC50550 sealant to the main bearing cap rear mating surfaces on the cylinder block. (Arrowed in Figure 2)
12. Carefully locate main bearing cap into position.
13. Start but do not tighten side bolts.
14. Apply initial torque of 13.5 Nm (10 lbf.ft.) to the main bearing cap bolts and side bolts.
15. Apply final torque of 92 Nm (68 lbf.ft.) to the main bearing cap bolts.
16. Apply final torque of 45 Nm (33 lbf.ft.) to the main bearing cap side bolts.
17. Refer to Workshop Manual section 12.21.20 and install new crankshaft rear oil seal to crankshaft.
18. Inspect camshaft oil gallery plugs and the camshaft bore cup plug for leakage.
19. If leakage is determined, refer to Technical Information Bulletin 12/01/02/NAS and seal.
20. Install starter motor and sump.
21. Install torque converter drive plate.