C3.3B Tier 4 Interim and EU Stage 3A Engines for Caterpillar Built Machines – Water Temperature Regulator – Remove and Install

Removal Procedure


Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Dispose of all fluids according to local regulations and mandates.

  1. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change" for the correct draining and filling procedures.

    Note: Coolant only needs drained to below the water temperature regulator.

    Illustration 1g03348707

  1. Disconnect hose (1) .

  1. Remove bolts (2) from the water temperature regulator housing. Remove water temperature regulator elbow (3) .

    Illustration 2g02794381

    Illustration 3g02794385

  1. Remove gasket (5) and remove water temperature regulator (4) from the water temperature regulator housing.

    Note: Note the orientation of the water temperature regulator elbow.

Installation Procedure

Note: Refer to Specification UENR3421 "Engine Design" for non-specified engine Torque Values.

  1. Install water temperature regulator (4) in the reverse order of removal.

    1. Check the water temperature regulator for correct operation. Refer to System Operation, Testing and Adjusting, "Water Temperature Regulator - Test" for the correct procedure to test the water temperature regulator. If any components of the water temperature regulator housing are worn or damaged, the complete assembly must be replaced.

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