Hino S5-LJ05E04A Workshop Manual page 316

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