Valve Seat Inspection/Repair - Mazda 2006-2008 RX7 Engine Workshop Manual

2. Tap the valve guide in from the top of the cylinder
head until the SSTs contacts the cylinder head.
3. Verify that the valve guide protrusion height
(dimension A) is within the specification.
Valve guide protrusion height (standard)
12.2—12.8 mm {0.481—0.503 in}
End Of Sie

VALVE SEAT INSPECTION/REPAIR

1. Measure the seat contact width.
• If not within the specification, resurface the
valve seat using a 45° valve seat cutter and/or
resurface the valve face.
Valve seat contact width (Standard)
1.2—1.6 mm {0.048—0.062 in}
2. Verify that the valve seating position is at the
center of the valve face.
(1) If the seating position is too out side, correct
the valve seat using a 70° (IN) or 65° (EX)
cutter, and a 45° cutter.
(2) If the seating position is too inner side, correct
the valve seat using a 35° (IN) cutter, and a
30° (EX) cutter, and a 45° cutter.
3. Inspect the sinking of the valve seat. Measure the
protruding length (dimension L) of the valve stem.
• If not specified, replace the cylinder head.
Valve protrusion height (Standard)
IN: 40.64—42.24 mm {1.600—1.662 in}
EX: 40.50—42.10 mm {1.595—1.657 in}
01–10–14
MECHANICAL
49 L012 003A
49 L012 002A
L
49 L012 004A
VALVE GUIDE
VALVE GUIDE
A
CYLINDER HEAD
SEAT CONTACT
WIDTH
IN
70°
45°
35°
B3E0110E072
C3U0110E004
E5U011010102E01
ADA2224E019
EX
65°
45°
30°
B3E0110E133
C3U0110E006