OEM Chevrolet Avalanche 1500 Exhaust Manifold

Chevrolet Avalanche 1500 Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Driver Side
  12616285
  Q: How to replace the left exhaust manifold on Chevrolet Avalanche 1500?

  A:

  The first step to replace the left Exhaust Manifold requires removing Ignition Coils and Spark Plugs before elevating the vehicle with support. Start by removing Exhaust Manifold pipe nuts then lower the automobile. After removing Exhaust Manifold bolts and manifold along with the gasket the old gasket should be discarded. In some cases the Exhaust Manifold heat shield will need to be unbolted along with its shield before removal. An inspection and cleaning process should be performed on the Exhaust Manifold unless the replacement plan includes new manifold installation. When performing an installation the heat shield and bolts need to be attached to the Exhaust Manifold before tightening them to 9 nm (80 inch lbs.). To prepare the bolt holes for installation, inspect and clean the threads on Exhaust Manifold bolt holes before omitting threadlock material from the initial three bolt threads. The thread ends of Exhaust Manifold bolts require a 5 mm (0.2 inch) wide application of threadlock gm p/n 12345493 (Canadian P/N 10953488) or its equivalent product. Start by tightening the center bolts followed by progressive side-to-side movement of bolt tightness toward the outside bolts until reaching 15 nm (11 ft. Lbs.) and complete this process once again with a final tightening to 25 nm (18 ft. Lbs.). Establish a flat surface on the Exhaust Manifold gasket at the left cylinder head rear section by bending it with a flat punch. Position the vehicle for the second time before adding and torquing the Exhaust Manifold pipe nuts to 50 nm (37 ft. Lbs. Torque). You should install spark plugs and ignition coils after lowering the vehicle.
• Exhaust Manifold
  12677665
  Q: How to replace the right exhaust manifold on 4.8L, 5.3L, and 6.0L engines on Chevrolet Avalanche 1500?

  A:

  The replacement procedure for the right Exhaust Manifold on 4.8l, 5.3l, and 6.0l engines begins with Ignition Coil and Spark Plug removal followed by vehicle elevation and support. First remove Exhaust Manifold pipe nuts followed by lowering the vehicle to unlatch the Exhaust Manifold bolts and manifold with its gasket. Discard these items before moving ahead. Removing heat shield bolts along with shield components from the Exhaust Manifold becomes necessary for some repairs. Install new exhaust manifolds only if you plan to check them for cleanliness since a replacement is not needed. Use the heat shield together with its bolts to secure the Exhaust Manifold after proper bolt tightening to 9 nm (80 inch lbs.). The Exhaust Manifold bolts should receive their stated torque setting because improper installation degrades both emission performance and on-board diagnostics (OBD) ii system execution. The bolts which secure the Exhaust Manifold to the Cylinder Head must have thread-holes that are clear of dust and thread-lock compounds while excluding any sealant application from the first three threaded sections. A 5 mm (0.2 inch) wide coating of threadlock gm p/n 12345493 (Canadian P/N 10953488) or equivalent product needs to be applied to the Exhaust Manifold bolt threads. First tighten the center two bolts and then alternate between the sides when installing the Exhaust Manifold with its new gasket and bolts until they reach 15 nm (11 ft. Lbs.). Perform a final tightening phase to 25 nm (18 ft. Lbs.) by repeating the same side-to-side pattern. Use a flat punch to bend over the front part of the exposed Exhaust Manifold gasket at the right Cylinder Head. Finish by reinstalling spark plugs alongside ignition coils then raise the vehicle to put Exhaust Manifold pipe nuts in their place until they reach 50 nm (37 ft. Lbs.) torque before lowering it down.