INSTALLATION
(1) Clean cylinder head cover and both sealing sur-
faces. Inspect and replace gaskets as necessary (Fig.
27).
(2) Install cylinder head covers and hand start all
fasteners. Verify that all double-ended studs are in
the correct locations as shown in (Fig. 26).
(3) Tighten cylinder head cover attaching bolts and
double-ended studs to 12 N·m (105 in. lbs.).
(4) Connect all electrical connectors and harness
clips.
(5) Install ignition coil capacitors and fasteners.
(6) Install upper intake manifold. (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
INSTALLATION)
INTAKE/EXHAUST VALVES &
SEATS
DESCRIPTION
The valves are made of heat resistant steel, and
have chrome plated stems to prevent scuffing (Fig.
11). The four valves per cylinder (two intake and two
exhaust) are actuated by roller rocker arms, which
pivot on stationary lash adjusters. All valves use
three bead lock keepers to retain springs and to pro-
mote valve rotation.
OPERATION
The intake valve allows the air/fuel mixture to
enter the combustion chamber. The exhaust valve
allows the burned air/fuel mixture to exit the com-
bustion chamber. Also, the intake and exhaust valves
seal the combustion chamber during the compression
and power strokes.
STANDARD PROCEDURE - VALVE AND VALVE
SEAT REFACING
The intake and exhaust valves have a 44.5 to 45
degree face angle. The valve seats have a 45 to 45.5
degree face angle. The valve face and valve seat
angles are shown in (Fig. 28).
Fig. 25 Camshaft Chain Timing
1 - PLATED CHAIN LINKS
2 - CAMSHAFT TIMING MARKS
Fig. 26 Cylinder Head Covers
Fig. 27 Cylinder Head Cover Gasket and Spark Plug
Seals
1 - ONE PIECE GASKET
2 - SPARK PLUG WELL SEALS
LH ENGINE 2.7L 9 - 31
CYLINDER HEAD COVER(S) (Continued)
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