RETROFIT 88/89/90 ENGINE OIL PRESSURE/FUEL PUMP SWITCH
Subject: RETROFIT 1988-90 ENGINE OIL PRESSURE/FUEL PUMP SWITCH WITH 1991 MODEL YEAR SWITCH
Models Affected: 1988-90 LEMANS
It is now possible to install the 1991 model year engine oil pressure/fuel pump switch P/N 25036941 on all past model LeMans vehicles replacing switch P/N 90240259. The 1991 model year switch will provide increased durability in the event of a failure of the existing switch.
PARTS REQUIRED:
Quantity Part Number Description -------- ----------- ------------------------- 1 25036941 Switch, Oil Pressure/ Fuel Pump
1 11023582 Sealing Ring
1 96136302 Kit, Jumper Wire Assembly
1 NPN Strap
Parts are expected to be available on April 8, 1991. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be cancelled as incorrectly ordered while the 400 control is in place.
Procedures:
1. Disconnect the positive battery cable.
2. Disconnect the engine oil pressure/fuel pump switch harness connector from the switch (Refer to 1990 LeMans Service Manual Page 8A-201-3 Figure A). It will be necessary to raise the vehicle on a hoist and remove the right hand lower plastic engine compartment splash shield to gain access to the oil pressure switch and harness.
3. Detach the existing connector from the switch wiring harness by cutting the three wires even with the base of the connector.
4. Slip one of the three shrink tube seals from the jumper wire kit over each of the jumper wire leads prior to connecting the three wires from the switch harness to the wire leads on the new jumper wire assembly, P/N 96136302. Make sure that the wire colors on the jumper wire assembly match the corresponding wire colors on the wire harness before crimping and soldering the splice clips. Then place the "shrink tube" seals over the splices and heat the shrink tube seals with a heat gun to provide a water tight seal for the wire splices.
5. Remove the existing oil pressure switch, P/N 90240259 from the cylinder block and replace it with the new part P/N 25036941. A sealing ring, P/N 11023582 must be installed on the new oil pressure switch to prevent oil leakage. Torque the switch unit to 20-34 N.m. (15 - 25 lbs. ft.) of torque.
6. Connect the switch harness connector to the switch.
7. Using a tie-strap, strap the oil pressure/fuel pump switch wire harness to the generator wire harness removing any slack and preventing contact of the harness with the right hand drive axle.
8. Reinstall the positive battery cable. With the ignition in the "On" position and the engine not running, the instrument panel oil pressure light should be "Illuminated" with the engine running, the light should go "Off".
9. After running the engine, check for any oil leakage from the engine oil pressure/fuel pump switch.
10. Reinstall the right hand engine compartment lower splash shield.
The jumper wire assembly, oil pressure/fuel pump switch, and sealing washer are available from GMSPO.
Labor Operation Number: T 1700
Labor Time : 0.5 Hours
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
