Cylinder Head Assembly Inspection - Honda BF135A Manual

7. CYLINDER HEAD ASSEMBLY
INSPECTION
• VALVE SPRING FREE LENGTH
Measure the free length of the valve springs.
IN/EX
• VALVE FACE/VALVE STEM O.D.
<Valve face>
Inspect each valve face for pitting or wear irregularities. Inspect
each valve face for even seat. Replace the valve if necessary.
<Valve stem>
1) Check each valve for bend, seizure or damage.
2) Insert each valve into the corresponding valve guide to
check the operation.
3) Measure the valve stem O.D. at the sliding surface of the
valve guide.
5.475 – 5.485 mm
IN
(0.2156 – 0.2159 in)
5.450 – 5.460 mm
EX
(0.2146 – 0.2150 in)
• VALVE LENGTH/VALVE O.D.
108.7 – 109.5 mm
IN
(4.28 – 4.31 in)
OVERALL
LENGTH
108.3 – 109.1 mm
EX
(4.26 – 4.30 in)
34.85 – 35.15 mm
IN
(1.372 – 1.384 in)
VALVE
O.D.
29.85 – 30.15 mm
EX
(1.175 – 1.187 in)
• VALVE GUIDE I.D.
Using the valve guide reamer, 5.525 mm (special tool), ream
the valve guides to remove any carbon deposits before
measuring. Measure and record each valve guide I.D.
NOTICE
Turn the valve guide reamer, 5.525 mm (special tool) clockwise
and never turn it counterclockwise. Continue to turn the
reamer as you lift it from the valve guide.
5.51 – 5.53 mm
IN/EX
(0.217 – 0.218 in)
10-23
STANDARD SERVICE LIMIT
49.64 mm
(1.954 in)
STANDARD SERVICE LIMIT
5.445 mm
(0.2144 in)
5.420 mm
(0.2134 in)
STANDARD SERVICE LIMIT
STANDARD SERVICE LIMIT
5.55 mm
(0.219 in)
[1]
VALVE FACE
[1]
OVERALL LENGTH
[2]
VALVE
O.D.
[1]
VALVE GUIDE
REAMER, 5.525 mm
07HAH-PJ70100