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ase_master327
ase_master327, Shop Owner
Category: Ford
Satisfied Customers: 5288
Experience:  +15 years experience with Fords. Bumper to bumper diagnosis & repair.
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Where is the oil sending unit located

Customer Question

where is the oil sending unit located on a V6 ford ranger truck 1991
Submitted: 9 years ago.
Category: Ford
Expert:  ase_master327 replied 9 years ago.
  • 3.0L engine-Behind the right cylinder head, in the engine block. Picture at bottom.

  • 2.9L and 4.0L engines-Left side front of the engine, below the cylinder head in the engine block

  • 5.0L engines-Left-hand front of the engine, below the rocker arm cover


  • TESTING

    See Figures 1 and 2

    Click image to see an enlarged view
    Fig. 1: Oil pressure sender and gauge wiring schematic




    Oil Pressure Sender

    Use the accompanying diagnostic chart to help pinpoint oil pressure sender and oil pressure gauge malfunctioning.


    Oil Pressure Switch

    1. To test the oil pressure switch, open the hood and locate the switch.

    2. Disconnect the wire from the switch. Attach one end of a jumper wire to the terminal on the end of the wire, then touch the other end of the jumper wire to a good engine ground (any bare metal engine surface). Have an assistant observe the instrument gauge cluster while you do this and tell you if the low oil warning lamp illuminates or not; the low oil warning lamp should illuminate.

      1. If the lamp does not illuminate, skip to Step 3.

      2. If the lamp does illuminate, replace the switch with a new one.

    3. Before jumping to any bad conclusions, try a different area for grounding the jumper wire on the engine. If the lamp still does not illuminate, touch the jumper wire end to the negative (-) battery post.

      1. If the lamp illuminates, the problem lies with the engine not being properly grounded.

      2. If the lamp does not illuminate, skip to Step 4.

    4. Connect the original wire to the oil pressure switch. While sitting in the vehicle, turn the ignition switch to the ON position without actually starting the engine. Observe the other lights on the instrument cluster.

      1. If all of the other lights illuminate when turning the ignition switch ON, the oil pressure switch is defective and must be replaced.

      2. If none of the other lights illuminate, there is a problem with power supply to the instrument cluster and gauges.


    REMOVAL & INSTALLATION

     

    Click image to see an enlarged view
    Fig. 3: Oil pressure and level switches used on the 2.9L and 4.0L engines


    Click image to see an enlarged view
    Fig. 4: Oil pressure and level switches used on the 3.0L engine

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