Acura NSX 1991 Manual page 121

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Cylinder Heads
Installation
Rear:
8 x 1.25 mm
22 N-m (2.2 kg-m,
16 Ib-ft)
EXHAUST
MANIFOLD
COVER
Install the cylinder heads on the engine block.
The cylinder head dowel pins and the head oil con-
trol orifice must be aligned.
• Always use a new cylinder head gasket.
• Clean the oil control orifice before installing.
CYLINDER HEAD OIL CONTROL
GASKET ORIFICES
Replace. Clean.
DOWEL PIN
O-RING
Replace.
Table of Contents
REAR PRIMARY
HO2S
45 N-m (4.5 kg-m,
33 Ib-ft)
Be careful not to damage.
GASKET
Replace.
REAR EXHAUST
MANIFOLD
SELF-LOCKING NUT
8 x 1.25 mm
34 N-m (3.4 kg-m,
25 Ib-ft)
Replace.
CYLINDER HEAD
GASKET
Replace.
DOWEL
PINS
4. Tighten the cylinder head bolts sequentially in two
or three steps.
• Apply clean engine oil to the bolt threads and
washer contact surfaces.
Specified Torque
11 x 1.5 mm
78 N-m (7.8 kg-m, 56 Ib-ft)
NOTE: We recommend using a beam-type torque
wrench. When using a preset-type torque wrench,
be sure to tighten slowly and not to over-tighten.
CYLINDER HEAD BOLTS TORQUE SEQUENCE
CYLINDER HEAD BOLT
11 x 1.5 mm
78 N-m (7.8 kg-m, 56 Ib-ft)
Apply clean engine oil to the
bolt threads and washer contact
surfaces.