Acura 1994 Integra Service Manual page 133

Valve Seats
Reconditioning
Renew the valve seats in the cylinder head using
valve seat cutters.
NOTE: lf guides are worn, replace them before cut-
ting the valve seats.
C a r e f u l l y c u t a 4 5 o s e a t , r e m o v i n g o n l y e n o u g h
materialto ensure a smooth and concentric seat.
Bevel the upper edge of the seat with the 30' cutter
and the lower edge of the seat with the 60'cutter'
Check width of seat and adjust accordingly.
Make one more very light pass with the 45o cutter to
remove anv possible burrs caused by the other cut-
ters.
Valve Seat Width:
Stlndard:
1.25 - 1.55 mm {0.0,19 - 0.061 in)
Ssrvico Limit 2.0 mm 10.08 in)
SEAI wlDTH
After resurfacing the seat, inspect for even valve
s e a t i n g : A p p l y P r u s s i a n B l u e C o m p o u n d t o t h e
valve face, and insen valve in original location in
thc hea.l. then lift it and snap it closed against the
seat several times.
ACTUAL SEATING
SURFACE
VALVE
SEAT
PRUSSIAN BLUE
1 .
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 steml, 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.
. lf it is too low (closer to the valve edge), you
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 alwavs be made with
the 45'cuttef.
lnsert intake and exhaust valves in the head and
measure valve stem installed height.
Intake Vllve St€m ln3tslled Hsighl:
Stsndard (Now): 37.'155 - 37.935 mm
(1.4750 - f .il935 in)
Sorvico Limit:
38.185 mm 11.5033 in)
Exhaust Valvo Stom In3talled Hoight:
Standard (Now): 37.165 - 37.6:15 mm
11.4{X}2 - 1.,1817 inr
Sewico Limit:
37.885 (1.i1915 in)
VALVE STEM
INSTALLED HEIGHT
8.
lJ valve stem installed height is over the service
limit, replace valve and recheck. lf still over the ser-
vice limit. replace cylinder head; the valve seat in
the head is too deeD.
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