Intake Manifold - Hummer H1 Service Manual

Section 2 Engine
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BEARING TANG
CRANKSHAFT
MAIN
BEARING
JOURNAL
TOOL J–8080
INSERTED IN
OIL HOLE
Figure 2-48: Removing/Installing Main Bearing
Upper Half with Cotter Pin or Equivalent
GASKET
05745159
MAIN BEARING UPPER
HALF (IN BLOCK)
CENTER MANIFOLD
O-RING
GASKET
LEFT/RIGHT
MANIFOLDS
Figure 2-49: Intake Manifold Attachment

INTAKE MANIFOLD

Service
A three-piece intake manifold is used on turbocharged diesel
engines (Figure 2-49). It consists of left and right manifold
halves and a center manifold. The center manifold joins the
other manifold halves to the turbocharger.
Gaskets and an O-ring seal are required at the manifold-to-cyl-
inder head and manifold joints. A single O-ring is used to seal
the center manifold-to-turbocharger flange joint.
Removal
1. Remove turbocharger. Refer to procedure in this section
under Turbocharger Service and Diagnosis.
2. Remove center manifold bolts. Remove manifold from
intake manifold halves and turbocharger. Discard
manifold gaskets and O-ring seal.
3. Remove brackets/clamps securing wire harnesses to
rocker covers and intake manifold halves.
4. Remove bolts/nuts/studs attaching intake manifold halves
to cylinder heads. Tap manifolds with rawhide mallet to
loosen and remove. Discard gaskets after removal.
Installation
1. Clean manifold and cylinder head gasket surfaces. Apply
light coat of Permatex High Tack, or #2 sealer to gaskets
and position gaskets on heads.
2. Install left and right manifold halves. Tighten attaching
bolts and studs to 25-37 lb-ft (34-50 N•m) torque.
3. Install turbocharger and center manifold as described in
this section.
RIGHT SIDE MANIFOLD
(LEFT SIDE SIMILAR)
GASKET
Engine 2-43