Valve, Valve Guide Inspection - Mazda 2006-2008 RX7 Engine Workshop Manual

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VALVE, VALVE GUIDE INSPECTION

1. Measure the valve head margin thickness of each
valve.
• If it is less than the specification, replace the
valve.
Valve head margin thickness (Minimum)
IN: 1.62 mm {0.0637 in}
EX: 1.82 mm {0.0716 in}
2. Measure the length of each valve. Replace the
valve if necessary.
• If it is less than the specification, replace the
valve.
Valve length (Standard)
IN: 102.99—103.79 mm {4.055—4.086 in}
EX: 104.25—105.05 mm {4.105—4.135 in}
Valve length (Minimum)
IN: 102.99 mm {4.055 in}
EX: 104.25 mm {4.104 in}
3. Measure the stem diameter of each valve in X
and Y directions at the three points (A, B, and C)
as indicated in the figure.
• If it exceeds the specification, replace the
valve.
Valve stem diameter (Standard)
IN: 5.470—5.485 mm {0.2154—0.2159 in}
EX: 5.465—5.480 mm {0.2152—0.2157 in}
Valve stem diameter (Minimum)
IN: 5.440 mm {0.2142 in}
EX: 5.435 mm {0.2140 in}
4. Measure the inner diameter of each valve guide in
X and Y directions at the three points (A, B, and
C) as indicated in the figure.
• If not as specified, replace the valve guide.
Valve guide inner diameter (Standard)
5.509—5.539 mm {0.2169—0.2180 in}
01–10–12
MECHANICAL
MARGIN THICKNESS
IN : 33.5 mm {1.31 in}
EX : 28.3 mm {1.14 in}
L
A
B
C
X
A
B
C
E5U011012111E01
C3U0110E051
B3E0110E068
X
Y
ADJ2224E024
Y
ADJ2224E026