Valve Seat Inspection/Refacing - Honda Activa SCV110 Service Manual Digest

CYLINDER HEAD/VALVES
NOTE:
Install the valve guide while measuring the valve guide
height from the cylinder head.
SPECIFIED HEIGHT:
IN/EX: 9.7 – 9.9 mm (0.382 – 0.389 in)
Let the cylinder head cool to room temperature.
Ream the new valve guides.
Insert the reamer from the combustion chamber side of
the head and always rotate the reamer clockwise.
TOOL:
Valve guide reamer
• Take care not to tilt or lean the reamer in the guide
while reaming.
• Use cutting oil on the reamer during this operation.
Clean the cylinder head thoroughly to remove any metal
particles after reaming and reface the valve seat (page
7-14).

VALVE SEAT INSPECTION/REFACING

INSPECTION
Clean all intake and exhaust valves thoroughly to remove
carbon deposits.
Apply a light coating of Prussian Blue to each valve face.
Tap the valve against the valve seat several times using a
hand-lapping tool, without rotating the valve, to make a
clear pattern.
Remove the valve and inspect the valve seat face.
The valve cannot be ground. If the valve face is burned or
badly worn or if it contacts the seat unevenly, replace the
valve.
Inspect the valve seat face for:
• Uneven seat width:
— Bent or collapsed valve stem:
Replace the valve and reface the valve seat
• Damaged face:
— Replace the valve and reface the valve seat
7-10
070MH – 001I160
VALVE GUIDE
VALVE GUIDE CLIP
VALVE GUIDE REAMER
DAMAGED FACE
CYLINDER HEAD
UNEVEN SEAT
WIDTH