The small end of the connecting rod is fitted with a bush made of

  1. Stainless steel
  2. Lead-based Babbitt
  3. Cr-Mo-Ni alloy steel
  4. Phosphor Bronze

Answer (Detailed Solution Below)

Option 4 : Phosphor Bronze
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The small end of connecting rod is fitted with a phosphor bronze bush and the small end is joined to the piston by a means of a piston pin passing through this bush.

On the other hand, precision bearings are used for camshaft fitted by press fit. These bushings are designed for radial load only.
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