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Caterpillar 3126B - page 21 / 26





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The plunger return spring pushes upward on the plunger and intensifier forcing oil around the poppet, through the holes in the poppet sleeve and out the adapter drain hole. As the plunger rises, pressure in the plunger cavity also drops to near zero. The fuel rail pressure unseats the plunger fill check, allowing the plunger cavity to fill with fuel. The fill cycle ends when the intensifier is pushed to the top of its bore. The plunger cavity is full and the fill check returns to its seat. Pressure in the intensifier and poppet chambers is zero. The injection cycle is complete and is ready to begin again.

Engine Replacement

No attempt is made herein to cover subjects related to maintenance and repairs to the Caterpillar Engine. These services are covered in the engine manual furnished by the Caterpillar. These instructions should be followed at all times. Your local Caterpillar facility is dedicated and capable of performing warranty repairs and other engine maintenance repairs. Contact your local Caterpillar distributor on any questions or problems related to engine performance.

Some basic suggestions should be considered when preparing to remove the engine.

  • 1.

    Place the bus on a clean, level, smooth floor to facilitate easy movement of the floor crane (fork lift) and transmission jack. Leave adequate room behind the bus to allow for safe removal of the engine package.

  • 2.

    Set parking brakes, chock rear wheels.

  • 3.

    Disconnect battery cables. If the bus is to be idle for an extended period, remove the batteries and place them on a trickle charge, or use them elsewhere.

  • 4.

    Close the heater shut-off valves to prevent draining the entire system.

  • 5.

    Drain coolant in a clean receptacle and store in a clean container.

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