Turbocharger And Center Manifold Removal - Hummer H1 Service Manual

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2-52 Engine
Intake Manifold Removal
1. Remove bolts and studs attaching each manifold half to
cylinder head.
2. Tap each manifold half with rawhide mallet to loosen it.
3. Lift and remove manifold halves and gaskets (Figures 2-70
and 2-71). Discard gaskets.
GASKET
Figure 2-70: Left Side Intake Manifolds Removal/
Installation
INTAKE MANIFOLD HALF
GASKET
Figure 2-71: Right Side Intake Manifold
Removal/Installation
Turbocharger and Center Manifold
Removal
1. Remove turbocharger inlet and outlet pipes.
2. Remove bolts attaching turbocharger to engine.
3. Remove bolts attaching vacuum actuator to turbocharger
and engine block.
4. Remove turbocharger and actuator.
5. Remove center manifold and gaskets (Figure 2-72).
INTAKE MANIFOLD
HALF
O-RING
GASKET
Figure 2-72: Center Manifold
Water Crossover Removal
1. Loosen clamp and disconnect bypass hose at water cross-
over (Figures 2-73 and 2-74).
DUAL THERMOSTAT
COVER
Figure 2-73: Water Crossover Location
2. Remove crossover attaching bolts/studs and remove
crossover. Discard crossover gaskets (Figure 2-74).
3. Remove thermostat housing and thermostats if required.
Note that turbo diesel has two thermostats (Figure 2-74).
.
WATER
GASKETS
CROSSOVER
Figure 2-74: Water Crossover Mounting
CENTER
MANIFOLD
GASKET
TURBOCHARGER
WATER CROSSOVER
CROSSING
THERMOSTAT
HOUSING
TWIN
THERMOSTATS
®