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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1648 (ENGINE MECHANICAL - 4.8L, 5.3L, 6.0L, 6.2L - SPECIFICATIONS)SPECIFICATIONSTHREAD REPAIR SPECIFICATIONSENGINE BLOCK - TOP/BOTTOM VIEWS
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A

Engine Block - Top/Bottom Views

2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Engine Block - Top/Bottom Views
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Block - Top/Bottom Views
GM1402164Courtesy of GENERAL MOTORS CORP.
Hole Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth - Maximum mm (in) Tap Depth - Maximum mm (in)
J 42385-
1 M8 x 1.25 210 206 207 208 209 22.5 (0.885) 17.5 (0.688)
2 M10 x 1.5 215 211 212 213 214 42.5 (1.67) 37.0 (1.45)
3 M10 x 2.0 104 101 N/A 102 103 31.0 (1.22) 25.5 (1.0)
4 M10 x 2.0 104 101 N/A 102 103 53.5 (2.10) 44.0 (1.73)
5 M8 x 1.25 210 206 207 208 209 26.5 (1.043) 19.0 (0.748)
  • Bolt hole 2 has an 11.5 mm (0.452 in) counterbore included in the 42.5 mm (1.67 in) drill depth. Use sleeve J 42385-311 with the drill and tap.
  • Bolt hole 3 has a 1.5 mm (0.059 in) counterbore included in the 31.0 mm (1.22 in) drill depth. Use sleeve J 42385-316 with the drill and tap.
  • Bolt hole 4 has a 20.5 mm (0.807 in) counterbore included in the 53.5 mm (2.10 in) drill depth.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.