Main Bearing Cap Bolt Diameter

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Check for bolts (M9 and M12) installed from lower side using the following procedure.
NOTE:
- Side bolt (M10) is outside the target.
- Figure shows M12 bolt.
Measure bolt diameter "d1" from tip of the bolt to dimension "a".
Measure bolt diameter "d" 2 from the dimension between tip of the bolt and dimension "b" as base station to dimension "c".
NOTE: If a narrower part in the threads is determined by visual check, measure "d2" at that point.
Calculate the difference between "d1" and "d2".

Fig 1: Measuring Diameter Of Main Bearing Cap Bolts
Courtesy of NISSAN MOTOR CO., U.S.A.
1. M9 bolt
  1. Dimension "a": 9 mm (0.35 in)
  2. Dimension "b": 15 mm (0.59 in)
  3. Dimension "c": 20 mm (0.79 in)
  4. Limit: 0.10 mm (0.0039 in)
2. M12 bolt
  1. Dimension "a": 12 mm (0.47 in)
  2. Dimension "b": 55 mm (2.17 in)
  3. Dimension "c": 20 mm (0.79 in)
  4. Limit: 0.15 mm (0.0059 in)
Replace applicable bolts if outside the limit.