OEM Chevrolet Silverado 3500 Exhaust Manifold

Chevrolet Silverado 3500 Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Driver Side
  12616285
  Q: How to remove and install the left exhaust manifold on Chevrolet Silverado 3500?

  A:

  Before removing the left Exhaust Manifold complete these steps: lift the vehicle and support it while removing the Exhaust Manifold pipe nuts and lowering the vehicle down. Start with Spark Plugs before Exhaust Manifold bolt extraction and proceed to remove the manifold along with its gasket before disposal. Before inspection of the Exhaust Manifold you must remove both shield bolts as well as shield from the Exhaust Manifold so you can clean and inspect the Exhaust Manifold properly. To assemble the left Exhaust Manifold users must first install the heat shield with its bolts to the Exhaust Manifold while tightening the bolts to 9 nm (80 inch lbs.). The installer should apply gm p/n 12345493 threadlocker (Canadian P/N 10953488) as a 5 mm (0.2 inch) wide band on each Exhaust Manifold bolt. Prior to application, the installer must ensure that the cylinder head Exhaust Manifold bolt hole threads are debris-free and without threadlocking material residues. Apply threadlocker only past thread position three away from the bolt end. Lock the Exhaust Manifold in place with the new gasket and bolts while starting from the middle then slowly shifting towards the outside until torque reaches 25 nm (18 ft. Lbs.) using the designed bolt sequence. When installing the spark plugs begin with bending over the exposed gasket edge at the back of the left cylinder head with a flat punch tool. After lifting the vehicle again install the Exhaust Manifold pipe nuts by torquing them to 50 nm (37 ft. Lbs.) before lowering to completion.
• Exhaust Manifold
  12677665
  Q: How to remove and replace the exhaust manifold on the right side for 4.8L, 5.3L, and 6.0L engines on Chevrolet Silverado 3500?

  A:

  The procedure for Exhaust Manifold replacement on the right side of 4.8l, 5.3l, and 6.0l engines demands that you begin by raising and supporting the vehicle before uninstalling the Exhaust Manifold pipe nuts. First lower the vehicle and then eliminate the Spark Plugs before disassembling the Exhaust Manifold bolts and manifold pieces while discarding the old gasket. The Exhaust Manifold heat shield needs to be separated from the manifold by removing its bolts and shield components along with it. Refurbish the Exhaust Manifold first before securing the heat shield to it along with the bolts then fasten the bolts to 9 nm (80 inch lbs.). The threads of the Exhaust Manifold bolts require a 5 mm (0.2 inch) wide strip of threadlock gm p/n 12345493 (Canadian P/N 10953488) or similar product whose application must occur after clearing the clean threads of debris from the cylinder head Exhaust Manifold bolt hole areas. Fasten the Exhaust Manifold along with its new gasket and bolts by first tightening their center points to 15 nm (11 ft. Lbs.) then moving to opposite bolts until reaching the outer bolts. After this initial phase complete an additional tightening to 25 nm (18 ft. Lbs.) following the same bolt pattern. Create a bend on the exposed gasket edges of the Exhaust Manifold at the front right cylinder head using a flat punch before installing spark plugs. The vehicle increases in height to install Exhaust Manifold pipe nuts while tightening them to 50 nm (37 ft. Lbs.) before proceeding with lowering the vehicle.