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Caterpillar 3126B - page 25 / 26





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Caution: When moving the assembly into the chassis, be careful to prevent damage to hoses, harnesses, cables, etc.

Caution: Take extreme care to see that no loose bolts, nuts, washers, debris are inside any of the pipes, hoses used in the engine intake air system; otherwise, severe damage can be caused to the turbocharger and inside the combustion chambers.


  • 1.

    Inspect the motor mount isolators for reuse, replace if in doubt.

  • 2.

    With the assistance of one or two aids, carefully move the engine back in place in the chassis.

  • 3.

    Install the front motor support crossmember. Torque mounting bolts to 170 ft/lbs.

  • 4.

    Lower engine onto the mounts, torque the mounting bolts to 226 ft/lbs.

  • 5.

    At this point, the most critical area lies in the proper routing, connecting, and securing the various harnesses and hoses to safeguard against interference or chafing with other objects. Make sure all support clips are back on the objects they were protecting.

  • 6.

    Reconnect driveshaft to transmission.

  • 7.

    Reinstall radiator module assembly, if it was removed.

  • 8.

    Install all plumbing to engine and transmission.

  • 9.

    Mount chassis rear bumper and upper support bar.

  • 10.

    Attach rear body bumper.

  • 11.

    Fill hydraulic reservoir, cooling system, and transmission.

  • 12.

    After all the fluids have been installed, remove the fuel solenoid wire from the solenoid. Rotate the engine with the starter until pressure is registered on the oil pressure gauge. Reconnect the solenoid wire, start the engine and check for leaks.

  • 13.

    Monitor the fluid levels immediately: Check hydraulic reservoir. Do not allow it to empty, otherwise, damage can be caused to the hydraulic pump. Monitor the coolant level. Bleeding the system is outlined in the Cooling section.

  • 14.

    Attach engine compartment door.

  • 15.

    Road test the bus for several miles; recheck for performance and leaks.

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