Paccar MX-13 – Installing pump unit lifters

  • Always install new pump unit lifters if the camshaft is replaced.
  • Never use pump unit lifters that have been dropped, are corroded, or are in any other way damaged.
  • New pump unit lifters require a more extensive pre-lubrication. This pre-lubrication is best started during the beginning of the repair activities

Installing NEW pump unit lifters
1. Before installation, the new pump unit lifters must be pre-oiled in clean engine oil, observing the following:

1. Allow the roller to fill with oil by submerging it slowly and keeping it in the oil for the rest of the procedure.
2. Once submerged, keep them in the oil untouched for 10 minutes.
3. Move the pump unit lifter back and forth in the engine oil for 30 seconds. Move in the direction of the axle.

4. Again, keep them in the oil untouched for 10 minutes.
5. Afterward, check that the roller runs smoothly by manually rotating the roller several times.
6. The time between dipping and installation must be no longer than 2 hours.

2. Fit the pump unit lifters into the engine block.
Do not drop the pump unit lifter onto the camshaft.

3. Apply the specified mounting product to the locking pins and tighten them to the specified torque.

4. Pour approximately 100 ml [3.38 fl oz] of clean engine oil on top of the pump unit tappets.

Re-installing pump unit lifters
1. Before re-installation, the pump unit lifters must be pre-oiled in clean engine oil, observing the following:

1. Allow the roller to fill with oil by submerging it slowly and keeping it in the oil for the rest of the procedure.
2. Once submerged, move the pump unit tappet back and forth in the engine oil for at least 20 seconds.
3. Afterward, check that the roller runs smoothly by manually rotating the roller several times.
4. The time between dipping and installation must be no longer than 2 hours.

2. Fit the pump unit lifters into the engine block.
Do not drop the pump unit lifter onto the camshaft.

3. Apply the specified mounting product to the locking pins and tighten them to the specified torque.

4. Pour approximately 100 ml [3.38 fl oz] of clean engine oil on top of the pump unit tappets.

 

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