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Caterpillar — Illustration 1

A Caterpillar service procedure — check it applies to your exact model before use.

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Procedure

  1. Remove bolts (4).
  2. Remove bolt (3).
  3. Remove bolts (2) and remove engine oil pump (1).
  4. Remove the O-ring seal that is located between the cylinder block and the outlet elbow.

Source: manual:Caterpillar-Cat-C9-Industrial-Engine-REH00001.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.