OEM Chevrolet Silverado 1500 Classic Exhaust Manifold

Chevrolet Silverado 1500 Classic Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Driver Side
  12616285
  Q: How to replace the left side exhaust manifold on a 4.3L engine on Chevrolet Silverado 1500 Classic?

  A:

  The replacement of the left side Exhaust Manifold on a 4.3l engine starts by lifting then supporting the vehicle while removing Exhaust Manifold pipe nuts. Start by lowering the vehicle and next disconnect the Spark Plug Wires from Spark Plugs before you remove the Spark Plug wire retainer bolts to place wire harness on engine top. The replacement process requires both Spark Plug extraction and unplugging of the engine coolant temperature (ECT) sensor electrical connector. After removing Exhaust Manifold bolts/stud and Spark Plug wire shield bolts you can take off both components and dispose of the worn-out Exhaust Manifold Gasket. The procedure requires the displacement of heat shield bolts and shield from the Exhaust Manifold while cleaning all required gasket mating surfaces. The Exhaust Manifold heat shield needs to be installed along with its bolts to a torque specification of 9 nm (80 inch lbs.). New Exhaust Manifold gaskets should receive tabs to secure both the gaskets and bolts before placing the Exhaust Manifold with plug wire shields. The threads of used Exhaust Manifold bolts/stud should receive gm threadlock gm p/n 12345493 (Canada's P/N 10953488) before torquing them to 30 nm (22 ft. Lbs.). Follow ect sensor electrical connector installation by adding spark plugs which should be tightened to 15 nm (11 ft. Lbs.) while placing the wire harness and bolt its retainer bolts to 12 nm (106 inch lbs.). Position spark wires to spark plugs next build the vehicle then install Exhaust Manifold pipe nuts and torque them to 50 nm (37 ft. Lbs.) before lowering down the vehicle.
• Exhaust Manifold
  12677665
  Q: How to replace the right exhaust manifold on a 4.3L engine on Chevrolet Silverado 1500 Classic?

  A:

  First support the vehicle at a raised position before removing the right Exhaust Manifold pipe nuts from a 4.3l engine. The first step involves lowering the vehicle while you detach the air cleaner outlet duct clamp that connects to the maf/iat sensor. Start the procedure by taking off the positive crankcase ventilation (PCV) hose then the air cleaner adapter nut. Climb the air cleaner outlet duct above the Throttle Body so you can detach it from its position before taking out the oil level indicator tube. The first step is to unfasten Spark Plug Wires while removing the retainer bolt for Spark Plugs followed by relocating the wire retainer above the engine before taking out the spark plugs. Before installing the Exhaust Manifold and Spark Plug heat shield bolts you need to remove the Exhaust Manifold and Spark Plug heat shield components before discarding Exhaust Manifold gaskets. The procedure requires removal of the Exhaust Manifold heat shield for cleaning of all gasket mating surfaces. The procedure for installation includes fitting the Exhaust Manifold heat shield together with its bolts that need to be tightened to 9 nm (80 inch lbs.). Place new Exhaust Manifold gaskets under the tabs which will guide the bolts before installing the Exhaust Manifold along with its plug wire shields. The threads of Exhaust Manifold bolts require gm p/n 12345493 threadlock gm p/n 12345493 (Canadian P/N 10953488) for the reused fasteners before installation at a torque of 30 nm (22 ft. Lbs.). Following Spark Plug installation, position the retainer to the engine while installing the bolt in a loose condition before attaching each wire. The oil level indicator tube installation requires tightening the Spark Plug wire retainer bolt to 12 nm (106 inch lbs.). The air cleaner outlet duct needs to be positioned downward while aligning its hinge clip with the Throttle Body lip to insert the mounting stud through the hole. After this, fasten both the air cleaner adapter nut and the pcv hose. Screw the air cleaner outlet duct clamp at the maf/iat sensor then lift the vehicle while installing and tightening the right Exhaust Manifold pipe nuts to 50 nm (37 ft. Lbs.).