FixVault

Connecting Rod

WARNING: This page is about a different variant/trim than selected.
  1. Replace the connecting rod, if the large or small end thrust surface is damaged.
  2. Check for bend or twist using a connecting rod aligner. Replace the connecting rod if the bend or twist exceeds the limit.

    Limit of bend or twist per 100 mm (3.9370 in) in length: 

    0.10 mm (0.0039 in)

    G13640726Courtesy of SUBARU OF AMERICA, INC.
  3. Install the connecting rod with bearings attached to the crankshaft, and using a thickness gauge, measure the thrust clearance. If the thrust clearance exceeds the standard or uneven wear is found, replace the connecting rod.

    Connecting rod thrust clearance: 

    Standard 

    0.070 - 0.330 mm (0.0028 - 0.0130 in)

    G04997781Courtesy of SUBARU OF AMERICA, INC.
  4. Inspect the connecting rod bearing for scar, peeling, seizure, melting, wear, etc.
  5. Measure the oil clearance on each connecting rod bearing using plastigauge. If any oil clearance is not within the standard, replace the defective bearing with a new part of standard size or undersize as necessary.

    Connecting rod oil clearance: 

    Standard 

    0.017 - 0.045 mm (0.0007 - 0.0018 in)

    Unit: mm (in)
    Bearing Bearing size (Thickness at center) Outer diameter of crank pin
    Standard 1.490 - 1.506 (0.0587 - 0.0593) 51.976 - 52.000 (2.0463 - 2.0472)
    0.03 (0.0012) Undersize 1.504 - 1.512 (0.0592 - 0.0595) 51.954 - 51.970 (2.0454 - 2.0461)
    0.05 (0.0020) Undersize 1.514 - 1.522 (0.0596 - 0.0599) 51.934 - 51.950 (2.0447 - 2.0453)
    0.25 (0.0098) Undersize 1.614 - 1.622 (0.0635 - 0.0639) 51.734 - 51.750 (2.0368 - 2.0374)
  6. Inspect the bushing at connecting rod small end, and replace the connecting rod if it is worn or damaged.
  7. Measure the piston pin clearance at connecting rod small end. If the measured value is not within the standard, replace the connecting rod and piston pin as a set.

    Clearance between piston pin and bushing: 

    Standard 

    0 - 0.022 mm (0 - 0.0009 in)

    G04997782Courtesy of SUBARU OF AMERICA, INC.
    G04997775Courtesy of SUBARU OF AMERICA, INC.