How to remove and install the left exhaust manifold on an 8.1L engine on GMC Sierra 3500?

The first step when removing the left Exhaust Manifold on an 8.1l engine involves taking out the wheelhouse panel while untwisting Spark Plug boot half a turn to release it before selectively pulling the boot without touching the wire. The first step involves removing both the Spark Plug Wires from the spark plugs and ignition coils before extracting the spark plugs. Begin by lifting and supporting the vehicle before you uninstall the bolts and nuts on the left Exhaust Manifold heat shield and remove it from position. Initiate the operation by lowering the Exhaust Manifold to detach all nuts and bolts of the Exhaust Manifold before completely removing it. Remove the old Exhaust Manifold Gasket before cleaning the Exhaust Manifold to inspect its condition. When installing the Exhaust Manifold it requires a new gasket and proper bolting down where the bolt reaches 35 nm (26 ft. Lbs.) and the nuts secure at 16 nm (12 ft. Lbs.). From this position the car should be raised so workers can apply the Exhaust Manifold heat shield and bolt it into place with a torque of 25 nm (18 ft. Lbs.). Put the vehicle back into position before you attach the spark plugs and connect Spark Plug Wires to their respective ignition coils and spark plugs. Install the boot of the Spark Plug Wires completely by pushing against the exposed terminal area but without touching it with the metal heat shield. Finally, reinstall the wheelhouse panel.

OEM GMC Sierra 3500 Exhaust Manifold

Engine Exhaust Manifold

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9 Exhaust Manifolds found

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GMC Sierra 3500 Exhaust Manifold, Driver Side
Part Number: 12616285
$117.36 MSRP: $171.88
You Save: $54.52 (32%)
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Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Replaces: 12602037, 12562235, 12571678, 12564155
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
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GMC Sierra 3500 Exhaust Manifold, Passenger Side
Part Number: 12624683
$300.16 MSRP: $472.28
You Save: $172.12 (37%)
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Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold
- Position: Passenger Side
- Replaces: 97224586
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
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GMC Sierra 3500 Exhaust Manifold
Part Number: 12677665
$199.07 MSRP: $338.92
You Save: $139.85 (42%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Replaces: 12648339
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.0 L CNG, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 3500 Exhaust Manifold
Part Number: 97224587
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 6.6 L DIESEL
View related parts
GMC Sierra 3500 Exhaust Manifold, Passenger Side
Part Number: 12605246
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Replaces: 12562236, 12564157
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2003 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 3500 Exhaust Manifold, Passenger Side
Part Number: 12601751
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Exhaust Manifold, Driver Side
Part Number: 12557287
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2006 GMC Sierra 3500 | Base, SL, SLE, SLT, WT | 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Exhaust Manifold, Passenger Side
Part Number: 12557286
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2003 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 8.1 L GAS
View related parts
GMC Sierra 3500 Exhaust Manifold, Driver Side
Part Number: 12555621
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 3500 | Base, SL, SLE, SLT | 8 Cyl 8.1 L GAS

GMC Sierra 3500 Exhaust Manifold

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GMC Sierra 3500 Exhaust Manifold Parts Questions & Experts Answers

Exhaust Manifold
12677665
Q: How to remove and install the left exhaust manifold on an 8.1L engine on GMC Sierra 3500?
A: The first step when removing the left Exhaust Manifold on an 8.1l engine involves taking out the wheelhouse panel while untwisting Spark Plug boot half a turn to release it before selectively pulling the boot without touching the wire. The first step involves removing both the Spark Plug Wires from the spark plugs and Ignition Coils before extracting the spark plugs. Begin by lifting and supporting the vehicle before you uninstall the bolts and nuts on the left Exhaust Manifold heat shield and remove it from position. Initiate the operation by lowering the Exhaust Manifold to detach all nuts and bolts of the Exhaust Manifold before completely removing it. Remove the old Exhaust Manifold Gasket before cleaning the Exhaust Manifold to inspect its condition. When installing the Exhaust Manifold it requires a new gasket and proper bolting down where the bolt reaches 35 nm (26 ft. Lbs.) and the nuts secure at 16 nm (12 ft. Lbs.). From this position the car should be raised so workers can apply the Exhaust Manifold heat shield and bolt it into place with a torque of 25 nm (18 ft. Lbs.). Put the vehicle back into position before you attach the spark plugs and connect Spark Plug Wires to their respective ignition coils and spark plugs. Install the boot of the Spark Plug Wires completely by pushing against the exposed terminal area but without touching it with the metal heat shield. Finally, reinstall the wheelhouse panel.

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