Acura 2002 RSX Service Manual page 157

Cylinder Head
2.
1 .
Valve Seat Reconditioning
Inspect valve stem-to-guide clearance {see page 6-
37). lf the valve guides are worn, replace them (see
page 6-38) before cutting the valve seats.
Renew the valve seats in the cylinder head using a
valve seat cutter.
Carefully cut a 45'seat, removing only enough
material to ensure a smooth and concentric seat.
Bevel the upper and lower edges at the angles
shown in the illustration.
Check the width of the seat and adjust accordingly.
K20A3 engine:
|NTAKEr35'
EXHAUST:30"
15"
, \ - . 6 7 . 5 '
,-.-'8o'
l'xhausrl
i
E6' (Exhaust)
K20A2 engine:
INTAKE: 35'
EXHAUSTT 30"
: '15'
6-40
i
86' {€xhaust)
5. Make one more very light pass with the 45" cutter
to remove any possible burrs caused bythe other
cutters.
Valve Seat Width;
Standard {Newl: 1.25 1.55 mm (0.049 0.061 in.l
Service Limit:
2.00 mm (0.079 in.)
6. After resurfacing the seat, inspect for even valve
seating: Apply Prussian Blue compound (A) to the
valve face. lnsert the valve in its original location in
the head, then lift it and snap it closed against the
seat several times,
1 . The actual valve seating surface (B), 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 67.5" cutter to
move it down. then one more cut with the 45'
cutter to restore seat width.
. lf it is too low (close to the valve edge), you must
make a second cut with the 35" cutter lintake
side) or the 30'cutter (exhaust side) to move jt up,
then make one more cut with the 45" cutter to
restore seat width.
NOTE: The final cut should always be made with
the 45" cutter.