OEM Chevrolet Silverado 3500 Classic Exhaust Manifold

Chevrolet Silverado 3500 Classic Exhaust Manifold Parts and Q&A

• Exhaust Manifold
  12677665
  Q: How to replace the right side exhaust manifold on 4.8L, 5.3L, and 6.0L engines on Chevrolet Silverado 3500 Classic?

  A:

  The right side Exhaust Manifold replacement for 4.8l, 5.3l, and 6.0l engines requires vehicle suspension and Exhaust Manifold pipe nut removal. Start by lowering the vehicle before removing Spark Plugs then Exhaust Manifold bolts underside the manifold alongside its gasket which should be disposed. You should remove heat shield bolts and shield from the Exhaust Manifold when required. Measure and clean the Exhaust Manifold before inspection. In order to install the heat shield along with its bolts onto the Exhaust Manifold you must tighten the bolts to 9 nm (80 inch lbs.). The threaded hole sections in cylinder head Exhaust Manifold must be clean from debris and threadlocking substance before applying any sealant to only first three bolt threads. The procedure requires applying threadlock gm p/n 12345493 (Canadian P/N 10953488) or equivalent along 5 mm (0.2 inch) wide areas on the Exhaust Manifold bolts threads. The installation process requires fitting the Exhaust Manifold combined with a new gasket and bolts that need initial torque to 15 nm (11 ft. Lbs.) while starting with the center two bolts and moving alternately side-to-side towards the outside bolts before completing with a repeated pass at 25 nm (18 ft. Lbs.) through the same pattern. Use a flat punch to bend the exposed edges of the Exhaust Manifold Gasket located at the front of the right cylinder head followed by the installation of spark plugs. Reposition the vehicle before installing the Exhaust Manifold pipe nuts at 50 nm torque values followed by the final step of vehicle lowering.
• Exhaust Manifold, Driver Side
  12616285
  Q: How to replace the left side exhaust manifold on 4.8L, 5.3L, and 6.0L engines on Chevrolet Silverado 3500 Classic?

  A:

  The procedure to replace the left side Exhaust Manifold requires vehicle elevation and support after which Exhaust Manifold pipe nuts need removal. Follow Spark Plug removal with the procedure of disassembling the Exhaust Manifold bolts together with manifold and gasket while discarding the old gasket. Managers should take out the bolts from the heat shield and shield attached to the Exhaust Manifold. A thorough cleaning followed by a detailed inspection should be performed on the Exhaust Manifold. Mount the heat shield and attach its bolts to the Exhaust Manifold and fasten these bolts at 9 nm torque. The technician should clean the threads inside the holes of the Exhaust Manifold without sealing the first three threads of each bolt. A 5 mm (0.2 inch) wide band of threadlock gm p/n 12345493 (Canadian P/N 10953488) or equivalent solution needs application to Exhaust Manifold bolt threads. To install the Exhaust Manifold and new gasket along with bolts begin by tightening the central pair to 15 nm (11 ft. Lbs.) before alternating to outside bolts which should be tightened to 15 nm (11 ft. Lbs.) and finishing with a final tightening to 25 nm (18 ft. Lbs.) following the same pattern. A flat-punch tool should be used to crimp the exposed portion of the Exhaust Manifold gasket located at the rear of the left cylinder head. Reinstall the spark plugs before regaining vehicle height to install Exhaust Manifold pipe nuts that should be tightened to 50 nm (37 ft. Lbs.) and then lower the vehicle.