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Oil Pressure Switch Replacement (12/04/97/NAS)

Publication date: 1997-08-22
Reference number: 12/04/97/NAS

OIL PRESSURE SWITCH REPLACEMENT

OIL PRESSURE SWITCH REPLACEMENT

TECHNICAL SERVICE BULLETIN

Reference Number(s): 12/04/97/NAS, Date of Issue:  August 22, 1997
LAND ROVER: Range Rover Classic, Discovery, Defender
REFERENCE: WSM section 12
ISSUE: 2
SECTION: Engine
AFFECTED VEHICLES: Range Rover Classic (LH) All; Discovery (LJ) All; Defender (LD) All
Superceded Bulletin(s): 12/04/97/NAS
NOTE: The information in this TIB supersedes the previous version of 12/04/97/NAS.

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)
PARTS INFORMATION

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

TOOL INFORMATION

TOOL INFORMATION

Name P/N Description
Kent Moore Tool J-21757-03 Oil Pressure Switch Socket

WARRANTY CLAIMS

WARRANTY CLAIMS

SRO Description Time
12.60.50 Replace Oil Pressure Switch 0.45 hrs.

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 lbf.ft). See Fig 1 .
    Fig 1: Tightening Oil Pressure Switch
    G00304786
  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.
    NOTE: Use an oil pressure switch socket to install switch. (Kent Moore # J-21757-03 Fig 2 ).
    Fig 2: Oil Pressure Switch Socket
    G00304787
  3. Install new oil pressure switch with new copper crush washer and torque to 20-25 Nm (15-19 lbf.ft.).
  4. Apply electrical connector grease into the female electrical connector and install on switch.
  5. Top off engine oil if necessary.
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