Honda Acura NSX 1991, Service Manual

Page: 102 / 1420

Cylinder Heads
Removal
NOTE: Engine removal is not required in this procedure.
CAUTION:
To avoid damaging the cylinder heads, wait
until the coolant temperature drops below
before loosening the retaining bolts.
NOTE:
l Inspect the timing belt before removing the
cylinder heads.
l
Turn the crankshaft so that the No. 1 piston is at
top-dead-center (page 6-25, 261.
Mark ail emission hoses before disconnecting
them.
1.
2 .
Disconnect the negative terminal from the battery.
Remove the expansion tank cap.
Use care when removing the expansion
tank cap to avoid scalding by coolant or steam.
3 .
4 .
5.
Raise the car.
Remove the right rear wheel/tire.
Remove the engine under guard, then remove the
front exhaust pipe A.
6 . Remove the exhaust pipe A.
CAUTION: Do not use air wrench or hammer for
removing the exhaust pipe A and the catalytic con-
verter if the oxygen sensors are not to be removed.
GASKETS
Replace.
SELF-LOCKING NUTS
10 1.25
mm
kg-m, 25 lb-ft)
Replace.
REAR EXHAUST
P I P E A
REAR EXHAUST
PIPE A
.
SELF-LOCKING NUTS
10 1.25 mm
(3.4 kg-m, 25 lb-ft)
Replace.
Replace.
7. Remove the under cover, then remove the water
pipe drain bolts and drain the coolant.
8. Attach the hoses to front and rear engine drain
bolts, then loosen the bolts and drain the
coolant.
Bleed air from the cooling system when install-
ing the cylinder heads (page
CAUTION: Failure to comply with the bleeding
procedure could cause imperfect bleeding, which
may result in severe engine damage.
9. Remove the engine oil cooler base assembly (page
6-23).
IO. Lower the car.
11. Remove the strut bar (Page
12. Remove the intake manifold plate and top cover
(page
13. Remove the throttle cable by loosening the locknut,
then slip the cable and nut off the throttle bracket
and throttle link (page
NOTE:
Take care not to bend the cable when removing
it. Always replace a kinked cable with new one.
l
Adjust throttle cable when installing Section
11).
6-28