ENGINE MECHANICAL (J05E)
10–40
INSPECTING THE COMPONENTS
1.
INSPECTING THE VALVE AND VALVE SEAT
(1)
Use the straightedge and thickness gauge to measure the valve
sink. If a measurement reading exceeds the permissible limit,
replace the valve and valve seat.
(2)
Measure the angle of the valve seat and valve. If a measurement
value exceeds the permissible angle, adjust it.
2.
INSPECTING THE VALVE SPRING SEAT
(1)
Measure the wear of spring seats (upper and lower). If the per-
missible limit is exceeded, replace the seats.
3.
INSPECTING THE VALVE SPRING
(1)
Use the squareness gauge and thickness gauge to measure the
clearance A of the valve spring. If a measured clearance exceeds
the permissible limit, replace the valve spring.
VALVE SEAT
VALVE
INTAKE
EXHAUST
CYLINDER HEAD
AMOUNT OF
VALVE SINKING
SHTS021270900082
Measured item
Standard value
(mm {in.})
Permissible limit
(mm {in.})
Intake
0.55-0.85
{0.0217-0.0335}
1.1 {0.0433}
Exhaust
1.15-1.45
{0.0452-0.0571}
1.7 {0.0669}
INTAKE
VALVE
VALVE SEAT
30 °
45 °
EXHAUST
SHTS021270900083
Measured item
Stan-
dard
value
Permissible
angle
Valve
seat
Intake
30
30
-30
35’
Exhaust
45
45
-45
30’
Valve
face
Intake
30
29
30’-30
Exhaust
45
44
30’-45
C
A B
UPPER SEAT
LOWER SEAT
SHTS021270900084
Measure-
ment area
Standard value
(mm {in.})
Permissible limit
Thick-
ness A
3.2 {0.1260}
If the wear of A or B
added to the wear of C
exceeds 1 mm {0.0393
in.}
Thick-
ness B
5.5 {0.2165}
Thick-
ness C
1.0 {0.0393}
CLEARANCE A
SQUARENESS
GAUGE
SHTS021270900085
Measured item
Permissible limit
(clearance A)
Inner spring
2.0 mm {0.0787 in.}
Outer spring
2.0 mm {0.0787 in.}
