Honda HS828 Manual page 55

b. INSPECTION
• VALVE FACE/STEM O.D.
Inspect each valve face for pitting or wear irregulaties.
Inspect each valve for face irregularities, bending or abnormal stem
wear. Replace the valve if necessary. Measure and record each
valve stem O.D
I
~
STANDARD
IN 6.59 mm 10.259 in)
EX
i
6.55 mm 10.258 1n)
• VALVE GUIDE I. D.
NOTE
SERVICE LIMIT
6.44 mm 10.254 in)
640 mm 10.;152_1'1) _
• Ream the valve guides to remove any carbon deposits
before measuring
Measure and record each valve guide 1.0.
~
STANDARD SERVICE LIMIT
IN
6.60
mm
10.260
1n)
6.66 mm 10.262 in)
EX
6.60 mm 10.260 in)
6.66
mm
10.262
in)
Replace the guides if they are over the service limit.
• STEAM-TO-GUIDE CLEARANCE
Subtract each valve stem
0.0.
from the corresponding guide
1.0.
to obtain the stem-to-guide clearance
~
STANDARD
SERVICE LIMIT
IN
0.01 0.037
mm
10.0004 - 0.0015
in)
0.1 0
mm
(0.004
in)
EX
0.05 0077 mm
10 0020- 0.0030
in)
0.12
mm
(0.005
in)
lf the stem-to-guide clearance exceeds the service limit.
determine if the new guide with standard dimensionS would bring
the clearance within tolerance. If so, replace any guide as
necessary and ream to fit. If the stem-to-guide clearance exceeds
the service limit with new guides, replace the valves as well.
NOTE:
• Recondition the valve seats whenever the valve guides are
replaced.
• VALVE SPRING FREE PLAY
Measure the free length of the valve springs.
~
STANDARD
SERVICE LIMIT
IN 39.0
mm
11.54
in) 37.5 mm 11.48 in)
EX 39.0 mm 11.54 in) 37 5 mm 11.48 in)
Replace the springs if they are shorter 1han the service limit.
• VALVE SEAT WIDTH
Measure the valve seat width
~
STANDARD
IN
0.8
mm
10.03
in)
EX
0.8
mm
(0.03
in)
SERVICE LIMIT
2.0
mm
10.08
in)
2.0
mm
(0.08
in)
· -
If the valve seat width is under the standard. or over the service
11mit, recondition the valve seat (P. 8-6).
HS928
VALVE FACE
HONDA
HSB2S
«:
0.8 mm
(0.03
in)