Installation Instructions

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0321 F203
1 ENGINE
Valve Recessing
1. Clean the cylinder head, the valve face and seat.
2. Insert the valve into guide.
3. Measure the valve recessing with a depth gauge.
4. If the measurement exceeds the allowable limit, replace the
valve.
If it still exceeds the allowable limit after replacing the valve,
correct the valve seat face
of the cylinder head with a valve
seat cutter (Code
No: 07909-33102) or valve seat grinder.
Then, correct
the cylinder head surface with a surface
grinder.
Or, replace the cylinder head.
(Protrusion) 0.05 mm
Factory spec.
(0.0020 in.)
to
(recessing) 0.15 mm
Valve recessing (0.0059 in.)
Allowable limit
(recessing)
OAmm( .0157in.)
A109F025
(1) Cylinder Head Surface
(2)
Recessing
(3) Protrusion
0321F201
Clearance between Valve Stem and guide
1. Remove carbon from the valve guide section.
2. Measure the valve stem O.D. with an outside micrometer.
3. Measure the valve guide I.D. of the cylinder head at the most
wear part
as shown in the figure below with a small hole
gauge. And calculate the clearance.
4. If the clearance exceeds the allowable limit, replace the
valves. If it still exceeds the allowable limit, replace the valve
guide.
Factory spec.
0.035
to 0.065 mm
Clearance
between
0.0014 to 0.0025 in.
Valve Stem and valve
guide
Allowable limit
0.1 mm
0.0039 in.
Valve stem
0.0. Factory spec.
6.960
to 6.975 mm
0.2741 toO.2746 in.
Valve guide
1.0. Factory spec.
7.010to7.025mm
0.2760 to 0.2765 in.
II1II IMPORTANT
• After replacing the valve guide, be sure to ream to the
dimensions described in the table.
1-531