Hummer H1 Service Manual page 54

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Turbocharger Removal
1. Remove front console, rear console, engine cover, and dis-
connect related wiring and A/C ducting.
2. Remove turbocharger heat shielding.
3. Loosen clamps attaching turbocharger inlet tubes to
exhaust manifolds and turbocharger. Then work tubes
loose and remove them.
4. Remove air duct and hoses connecting turbocharger to air
cleaner.
5. Disconnect vacuum hose at wastegate vacuum actuator.
6. Loosen bolts that attach manifold crossover to left and
right manifold halves.
7. Prop manifold crossover up with blocks.
8. Lift, turn and tilt turbocharger to remove it (Figure 2-10).
Do not pry or force it off the engine.
05745159
Turbocharger Installation
1. Install new O-ring seal on turbocharger manifold outlet.
Do not reuse old O-ring as leakage may occur.
2. Clean gasket surfaces of intake manifold and crossover
housing.
3. Mount turbocharger on engine and install bolts that secure
it to engine block.
4. Tighten crossover housing bolts.
5. Install air inlet duct and hose and connect vacuum pump to
actuator.
6. Install turbocharger inlet tubes. Tighten flange clamps that
secure tubes to manifolds and turbocharger to 71 lb. in.
(8 N¥m) torque.
7. Install turbocharger and exhaust pipe heat shielding.
8. Install engine cover, console, and ducting
.
OIL
SEAL
PIPE
CLAMP
INLET
PIPE
PIPE
CLAMP
Figure 2-10: Turbocharger Mounting
Engine 2-17
VACUUM
ACTUATOR
TURBOCHARGER
INLET
PIPE
PIPE
CLAMP