3406E and 3456 Industrial Engines – Connecting Rod

Refer to Special Instruction, SMHS7366, “Using the 5P-2050 Connecting Rod Checking Fixture ” for information on checking and on reconditioning connecting rods. Also refer to Guideline For Reusable Parts, SEBF8064, “Salvage Of Non-Serrated Connecting Rods”.

Illustration 1 g01431986

(A) Bore in connecting rod for the piston pin bearing … 59.640 ± 0.013 mm (2.3480 ± 0.0005 inch)

Note: The connecting rod must be heated for the installation of the piston pin bearing. Do not use a torch.

(B) The connecting rod must be heated from 175 to 260 °C (347 to 468 °F) for the installation of the piston pin bearing. Maximum distance for heating the connecting rod … 85.0 mm (3.35 inch)

(C) Diameter for the bearing of the piston pin … 55.035 ± 0.008 mm (2.1667 ± 0.0003 inch)

Thoroughly lubricate the piston pin with clean engine oil prior to assembly of the piston and the connecting rod.

(1) The bearing joint must be within ± 5 degrees at either location.

(D) Distance between the centers of bearings … 261.62 ± 0.05 mm (10.300 ± 0.002 inch)

(2) Etch the cylinder number on the connecting rod and the cap in this location. Mark the connecting rod and the cap with a number 1 through 6. Mark the numbers on the same side of the connecting rod as the bearing tab slots.

(3) Connecting rod bolts

Use the following procedure in order to tighten the connecting rod bolts.

    Illustration 2 g01431988

    Torque-turn tightening method for connecting rod cap bolts

  1. Lubricate the bolt threads and the seating faces of the caps with 4C-5593 Anti-Seize Compound .
  1. Tighten the connecting rod bolts.

    Torque for bolts … 90 ± 9 N·m (66 ± 7 lb ft)

  1. Put a mark on each bolt and each cap.
  1. Tighten each bolt from the mark to angle (F) .

    Angle (F) … 90 ± 5 degrees (1/4 turn)

(E) Bore in the connecting rod for the bearing for the crankshaft connecting rod journal … 96.200 ± 0.013 mm (3.7874 ± 0.0005 inch)