Hummer H1 (2006+). Manual — part 179
3-58 Fuel, Emissions, and Exhaust
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EXHAUST SYSTEM
The 6.6L turbo diesel exhaust system consists of two cast iron manifolds a turbocharger, turbo down pipe, intermediate pipe,
catalytic converter and tailpipe. All exhaust components are made from stainless steel and assembled using grade 8 hardware.
Service to the exhaust system is replacement only (Figures 3-43 and 3-44).
Figure 3-43: Turbo Diesel
Turbo Down Pipe Replacement
Removal
1.
Remove the engine cover.
2.
Remove the intermediate pipe heat shield.
3.
Remove the exhaust clamps from the turbo to the down pipe, and from the down pipe to the intermediate pipe (Figure 3-44).
4.
Loosen the transfer case to exhaust pipe bracket bolt.
5.
Remove the down pipe and gasket.
6.
Remove all of the gasket material from the intermediate pipe.
Installation
7.
With new gaskets, position the new down pipe on the turbo and intermediate pipe. Tighten the clamps to 11 lb-ft. (15 N·m).
8.
Tighten the exhaust bracket bolt at the transfer case to 26 lb-ft. (35 N·m).
9.
Install the heat shield.
10. Install the engine cover and the console.
11. Start and run the engine. Verify that the exhaust components are clear of the body, frame and driveline components.
Catalytic Converter Replacement
Removal
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Fuel, Emissions, and Exhaust 3-59
1.
Loosen or remove the necessary frame brackets and clamps that retain the converter and the pipe (Figure 3-44).
2.
Remove the clamp attaching the converter to the intermediate pipe.
3.
Remove the flange bolts attaching the converter to the tail pipe.
4.
Remove the bolt at the transfer case bracket.
5.
Remove the converter and gaskets.
Installation
6.
With new gaskets position, the new converter assembly in the vehicle and loosely install the flange bolts and clamp.
7.
Connect the necessary exhaust brackets and clamps to the frame as required.
8.
Torque the exhaust flange bolts to 26 lb-ft. (35 N•m).
9.
Torque the clamp to 11 lb-ft. (15 N·m).
10. Tighten the frame bracket bolts.
11. Tighten the transfer case exhaust bracket bolt to 26 lb-ft. (35 N•m).
3-60 Fuel, Emissions, and Exhaust
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Figure 3-44: Exhaust System For VIN 6E226860 And Numerically Lower
HEATSHIELD
CATALYTIC
CONVERTER
GASKET
INSULATOR
TRANSFER CASE TO
EXHAUST PIPE
BRACKET
FRONT
TAILPIPE
HEATSHIELD
CUSHIONED
LOOP ASSEMBLY
TAILPIPE
BRACKET
CUSHIONED
LOOP ASSEMBLY
CUSHIONED
LOOP ASSEMBLY
GASKET
GASKET
CLAMP
CLAMP
TURBO DOWN
PIPE
INTERMEDIATE
PIPE
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Fuel, Emissions, and Exhaust 3-61
Figure 3-45: Exhaust System For VIN 6E226861 and Numerically Higher
TAILPIPE
CUSHIONED
LOOP ASSEMBLY
CUSHIONED
GASKET
TURBO DOWN
PIPE
HEATSHIELD
INTERMEDIATE
PIPE
CATALYTIC
CONVERTER
LOOP ASSEMBLY
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