Question 1

How to replace the left side exhaust manifold on 4.8L, 5.3L, 6.0L, and 6.2L engines on GMC Sierra 1500?

Accepted Answer

The first step to replace exhaust manifolds on 4.8l, 5.3l, 6.0l and 6.2l engines necessitates installing the j 42640 (Steering Column Anti-Rotation Pin) into the Steering Column lower access hole. The first task requires removing the left wheelhouse liner followed by complete vehicle lifting and proper support. Lower the vehicle partially using the jacking points before accessing the wheel opening for work. To disconnect the engine wires you need to twist boot sections one half-turn before extracting the boot from the Spark Plug and Ignition Coil connections. Write down how the upper intermediate Steering Shaft links to the Steering Column before proceeding to detach it by removing the Steering Shaft coupling bolt and nut. The technician must remove the Exhaust Manifold bolts before extracting the Exhaust Manifold body while throwing away the Exhaust Manifold Gasket along with the Catalytic Converter seal. To switch out the Exhaust Manifold remove first all the heat shield bolts before taking away the shield itself. Fitting the heat shield to the Exhaust Manifold requires securing it with bolts that should be tightened to 9 nm (80 lb in). Threads of Exhaust Manifold bolts require cleaning followed by application of threadlock gm p/n 12345493 (Canadian P/N 10953488) as a 5 mm (0.2 in) wide band. Screw in a new Catalytic Converter seal before putting in position the new Exhaust Manifold Gasket and Exhaust Manifold onto the Cylinder Head with attention to correct fitting to the Catalytic Converter. Begin with the middle bolts when installing the Exhaust Manifold bolts before following a pattern of side-to-side tightening starting at 15 nm (11 lb ft) and finishing with a final 20 nm (15 lb ft). Place the gasket tab bend at the Cylinder Head edge while lining the upper intermediate Steering Shaft correctly in front of the Steering Column. Install the Steering Shaft coupling bolt along with the nut on the upper intermediate Steering Shaft before torquing it to 50 nm (37 lb ft). For correct connection of the Spark Plug Wires to spark plugs and ignition coils ensure each boot receives proper positioning by pushing it to the sides. Fully raise and support the vehicle and proceed to install the Catalytic Converter by securing its Exhaust Manifold nuts to 50 nm (37 lb ft) torque. Recover the vehicle height and reinstall the left wheelhouse liner before taking out the j 42640 tool from the Steering Column lower access opening.

Question 2

How to replace the right side exhaust manifold for 4.8L, 5.3L, 6.0L, and 6.2L engines on GMC Sierra 1500?

Accepted Answer

The fundamental requirement for right side Exhaust Manifold replacement applies to all 4.8l, 5.3l, 6.0l, and 6.2l engines where the technician must remove the heated Oxygen Sensor (HO2S). Fully support the elevated vehicle before removing the nuts which secure the Catalytic Converter to the Exhaust Manifold while recognizing that the 1500 series esv model serves as an example since the 2500 series shares similar characteristics. Put the wheelhouse liner and Spark Plug Wires into a position where the boot should twist by half a turn before pulling the boot by itself. The engine block requires you to remove its oil level indicator tube bolt (419) along with the tube (420). Evacuate the Exhaust Manifold bolts before extracting the Exhaust Manifold while throwing out the Exhaust Manifold Gasket and seal. Lead removal requires operators to unfasten both the Exhaust Manifold heat shield bolts and to take away the heat shield. During installation position the Exhaust Manifold heat shield before mounting it with bolts which should be tightened to 9 nm (80 lb in). All Exhaust Manifold bolts require cleaning followed by the application of thread-lock gm p/n 12345493 (Canadian P/N 10953488) that covers the threads by 5 mm (0.2 in). Place the new Exhaust Manifold Gasket together with the Exhaust Manifold onto the cylinder head. Additionally place the Catalytic Converter seal before seating it properly. Start by tightening the Exhaust Manifold bolts to 15 nm (11 lb ft) following a pattern of center bolts first and then alternating side-to-side before reaching the final torque of 20 nm (15 lb ft) while also maintaining the same pattern. Using a flat punch bend the gasket tab which extends from its rear section around the cylinder head edge. The o-ring seal (421) should receive an inspection for damage before getting lubricated with engine oil. After that put in the oil level indicator tube (420) to the engine block while tightening the bolt (419) to 25 nm (18 lb ft). The Spark Plug Wires should be replaced on the spark plugs and ignition coils after installation through each boot by pushing in a sideways motion. After installing the correct wheelhouse liner, securely raise the vehicle once again before installing the Catalytic Converter to Exhaust Manifold nuts which you will tighten to 50 nm (37 lb ft). The installation process ends with partially lowering the vehicle towards the wheel opening for inserting the ho2s.

OEM GMC Sierra 1500 Exhaust Manifold

21 Exhaust Manifolds found

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12574320

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12631812

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12616285

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12629338

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12668118

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12668117

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12629337

GMC Sierra 1500 Exhaust Manifold Part Number: 12677665

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12631813

GMC Sierra 1500 Exhaust Manifold Part Number: 55513001

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12592082

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12592083

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12701710

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12701711

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12575342

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12574406

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12562408

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12563198

GMC Sierra 1500 Exhaust Manifold, Passenger Side Part Number: 12564161

GMC Sierra 1500 Exhaust Manifold, Driver Side Part Number: 12571679

GMC Sierra 1500 Exhaust Manifold

GMC Sierra 1500 Exhaust Manifold Parts and Q&A

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