Oil Pressure Switch - Oil Leakage

No: 12/04/97/NAS

Ref: WSM section 12

Issue: 2

Date: 08/22/97

Changes are noted by asterisks.

PRIDE IV 4-15

Oil Pressure Switch Replacement

AFFECTED VEHICLE RANGE:
RANGE ROVER CLASSIC (LH) All
DISCOVERY (LJ) All
DEFENDER (LD) All

SITUATION:

OIL PRESSURE SWITCH LEAKING

Failure of the oil pressure switch leads to oil leakage.

RESOLUTION:

NEW DESIGN OIL PRESSURE SWITCH

To eliminate oil leakage, a new oil pressure switch with a new material O-ring has been developed. The new design switch is to be installed in vehicles that have oil leakage from the oil pressure switch. The new switch is supplied with a new O-ring installed. A copper crush washer is also included for use on older (V-belt equipped) engines.

PARTS INFORMATION:

CAUTION:
Do not Install old part (AMR2092) or O-ring (STC3372)

LRNA4641 Oil Pressure Switch Kit with seals ............ Qty 1
^ LRNA210181 Rubber O-ring (Serpentine belt) ............... Available separately
^ LRNA5716 Copper Washer (V-belt engines) .............. Available separately
LRNASGP2 Electrical connector grease

TOOL INFORMATION





*Kent Moore Tool
J-21757-03 Oil Pressure Switch Socket*

WARRANTY CLAIMS:

12.60.50 ............... Time 0.45 hrs.
Replace Oil Pressure Switch

COMP CODE: .......... 7V4N

Normal warranty policy and procedures apply

REPAIR PROCEDURE:

NOTE:
All V-8 engines from 1987-1994 MY with V-belt driven accessories use a copper crush washer to seal the oil pressure switch. All V-8 engines 1994-to current production using serpentine belt driven accessories, require a rubber O-ring to seal the oil pressure switch.

REPLACE OIL PRESSURE SWITCH, SERPENTINE BELT ENGINE

1. Place vehicle on lift and raise vehicle.

2. Remove electrical connector from oil pressure switch.

3. Remove old oil pressure switch and O-ring.

CAUTION:
Do not use thread sealant on threads of oil pressure switch.

4. Inspect the threads in the front cover, and clean if necessary

5. Lubricate new O-ring with engine oil.

6. Install new oil pressure switch and tighten until O-ring is compressed.





7. Using Kent-Moore tool tighten the oil pressure switch a further 25° yielding 15 Nm (11 lb. ft). See Figure 2.

8. Apply electrical connector grease into the female electrical connector and install on switch.

9. Lower vehicle and top off engine oil if necessary.

REPLACE OIL PRESSURE SWITCH, V-BELT ENGINE

1. Locate oil pressure switch on oil pump housing. remove electrical connector, remove and discard oil pressure switch and copper crush washer.

2. Inspect threads in oil pump housing, and clean if necessary.





*N0TE:
Use an oil pressure switch socket to install switch. (Kent Moore # J-21757-03 Figure 3).*

3. Install new oil pressure switch with new copper crush washer and torque to 20-25 Nm (15-19 lb. ft.).

4. Apply electrical connector grease into the female electrical connector and install on switch.

6. Top off engine oil if necessary.