Engine Specs - S54 Rod Bolts

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Revision as of 13:52, 2 December 2016 by Rcollins (talk | contribs) (SPEC: OEM: Torque procedure)
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Rod Bolt Comparisons

The S54 has two different types of connecting rod bolts. The torque procedure for each is different.

  • Type-1: M11 x 1.25 mm thread pitch. 12 mm bi-hexagonal bolt head.
  • Type-2: M10 x 1.25 mm thread pitch. E12 Torx bolt head.

OEM Rod Bolts (M11 x 1.25, 12mm bi-hex bolt head)

SPEC: OEM: Torque procedure

Torque Angle
30 Nm 70 degrees
Remove bearing cap  
30 Nm 70 degrees


Make sure you are starting with new rod bolts.  Factory rod bolts must be replaced once used.

  1. Lubricate rod bolt threads and connecting rod cap bore holes with appropriate thread lubricant.
  2. Torque to 30-Nm, then using a torque-angle gauge tighten another 70-degrees.
  3. Remove bolts.
  4. Repeat steps 1, 2.

OEM Rod Bolts (M10 x 1.25, E12 Torx bolt head)

SPEC: OEM: Torque procedure

Torque Angle
30 Nm 105 degrees
Release bolts  
30 Nm 105 degrees
Release bolts  
30 Nm 105 degrees


Make sure you are starting with new rod bolts.  Factory rod bolts must be replaced once used.

  1. Lubricate rod bolt threads and connecting rod cap bore holes with appropriate thread lubricant.
  2. Torque to 30-Nm, then using a torque-angle gauge tighten another 105-degrees.
  3. Release bolts.
  4. Repeat steps 1-3
  5. Repeat steps 1, 2.