Mazda LF - Valve Seat Inspection;Repair; Valve Spring Inspection

ENGINE
B–15
B
VALVE SEAT INSPECTION/REPAIR
A6E242410102E01
1. Measure the seat contact width.
• If necessary, resurface the valve seat using a
45° valve seat cutter and/or resurface the
valve face.
Standard width:
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 30°
°°
° (IN) cutter, and a
0°
°°
° (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.
Standard dimension L:
IN: 40.64—42.24 mm {1.600—1.662 in}
EX: 40.50—42.10 mm {1.595—1.657 in}
End Of Sie
VALVE SPRING INSPECTION
A6E242412125E01
1. Apply pressing force to the pressure spring and
inspect the spring height.
• If not as specified, replace the valve spring.
Pressing force:
494.9 N {50.47 kgf, 111.2 lbf}
Standard height:
27.80 mm {1.094 in}
AME2224E316
AME2224E020
AME2224E079
AME2224E308
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