Removal - Acura NSX 1997 Service Manual

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Cylinder Heads

Removal

Engine removal is not required for this procedure.
Make sure jacks and safety stands are
placed properly and hoist brackets are attached to cor-
rect positions on the engine.
CAUTION:
• Use a fender cover (special tool) to avoid damaging
painted surfaces.
• Unplug the wiring connectors carefully while holding
the connector portion to avoid damage.
• To avoid damaging the cylinder heads, wait until the
engine coolant temperature drops below 100°F
(38°C) before loosening the retaining bolts.
• Do not open the engine cover when the roof panel is
stored (NSX-T open top).
NOTE:
• Unspecified items are common.
• Mark all wiring and hoses to avoid misconnection.
Also, be sure that they do not contact other wiring or
hoses or interfere with other parts.
• Inspect the timing belt before removing the cylinder
head.
• Turn the crankshaft pulley so that the No. 1 piston is
at top dead center (see page 6-19).
1. Disconnect the negative terminal from the battery.
2. Remove the expansion tank cap.
Use care when removing the expan-
sion tank cap to avoid scalding by engine coolant
or steam.
3. Raise the car, then remove the right rear wheel/tire.
4. Drain the engine coolant (see page 10-5).
Table of Contents
5. Remove the front exhaust manifold (M/T).
-1. Remove the center rod assembly and under
guard (see page 5-7).
-2. Remove the rear beam rod assembly (see page
5-8).
-3. Remove the front engine mount, then remove
the front beam (see page 5-8).
-4. Remove the front mount.
-5. Disconnect the front primary heated oxygen
sensor (front primary HO2S) connector and
front secondary heated oxygen sensor (front
secondary HO2S) connector, then remove the
front exhaust manifold and front three way cat-
alytic converter (TWC) assembly.
COVER
FRONT EXHAUST
MANIFOLD AND
Replace.
FRONT TWC
ASSEMBLY
FRONT ENGINE
MOUNT
GASKET
FRONT SECONDARY
Replace.
HO2S CONNECTOR
FRONT PRIMARY
HO2S CONNECTOR