Acura 1994 Integra Service Manual page 88

Valve Seats
ACTUAL
SEATING
SUBFACE
VALVE
SEAT
PRUSSIAN
Reconditioning
1. Renew the valve seats in the cylinder head using a
valve seat cutter.
NOTE: lf guides are worn (see page 6-24), replace
them (see page 6-251 before cutting the valve seats,
2 . C a r e f u l l y c u t a 4 5 ' s e a t , r e m o v i n g o n l y e n o u g h
material to ensure a smooth and concentric seat.
3.
Bevel the upper edge of the seat with the 30o cutter
and the lower edge of the seat with the 60' cutter.
Check width of seat and adjust accordingly.
4.
Make one more very light pass with the 45" cutter to
remove any possible burrs caused by the other cut-
ters.
Valvo Seat Width llntake and Exhaustl:
Standard:
1.25 - 1.55 mm {0.049 - 0.061 inl
Servics Limit:2.0 mm 10.08 inl
SEAT
WIDTH
After resurfacing the seat, inspect for even valve
seating: Apply Prussian Blue compound to the valve
f a c e , a n d i n s e r t v a l v e i n o r i g i n a l l o c a t i o n i n t h e
head, then lift it and snap it closed against the seat
severaltimes.
6-27
7 .
The actual valve seating surface, as shown by the
blue compound, should be centered on the seat.
.
lf it is too high (closer to the valve stem), you
must make a second cut with the 60" cutter to
move it down, then one more cut with the 45'
cutter to restore seat width.
.
l f i t i s t o o l o w ( c l o s e r t o t h e v a l v e e d g e l , y o u
must make a second cut with the 30' cutter to
move it up, then one more cut with the 45" cutter
to restore seat width.
NOTE: The final cut should always be made with
the 45' cutter.
Insert intake and exhaust valves in the head and
measure valve stem installed height
Intako Valve Stem Install€d Height:
Standard (New): /$.765 - '11.235 mm
{1.604It - 1.6234 in}
Service Limit:
ill.il85 mm (1.6:133 inl
Exhaust Valvo Stem lnstalled Height:
Standard {Newl: ,12.765 - i|:|.235 mm
11.6a37 - 1.1022 in1
Service Limit
/B.il85 mm (1.7120 inl
lf valve stem installed height is over the service
limit, reDlace valve and recheck. lf still over the ser-
vice limit, replace cylinder head; the valve seat in
the head is too deeo.
8.