Suzuki GF60A, Service Manual

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1D-38 Power Unit Mechanical:
Valve guide inside diameter
Using a small bore gauge, measure valve guide inside
diameter.
Valve guide inside diameter
Standard (IN.): 5.500 – 5.512 mm (0.2165 – 0.2170 in.)
Standard (EX.): 5.500 – 5.512 mm (0.2165 – 0.2170
in.)
Valve guide to valve stem clearance
Standard (IN.): 0.020 – 0.047 mm (0.0008 – 0.0019 in.)
Standard (EX.): 0.045 – 0.072 mm (0.0018 – 0.0028
in.)
Service limit (IN.): 0.070 mm (0.0028 in.)
Service limit (EX.): 0.090 mm (0.0035 in.)
Valve stem deflection
If unable to measure valve guide inside diameter, check
“Valve stem deflection”.
If measurement exceeds service limit, replace valve.
If measurement still exceeds service limit with new
valve, replace valve guide.
Measure valve stem deflection as follows;
1) Install valve into valve guide.
2) Position valve head at approx. 5 mm away from
valve seat.
3) Move valve head in the direction “a” – “b”, and
measure deflection.
Special tool
(A): 09900–20606 (Dial gauge)
(B): 09900–20701 (Magnetic stand)
Valve stem deflection
Service limit (IN.): 0.14 mm (0.006 in.)
Service limit (EX.): 0.18 mm (0.007 in.)
Valve stem end
Inspect valve stem end face for pitting and wear.
If pitting or wear is found, valve stem end may be
resurfaced.
Use caution when resurfacing, do not grind away stem
end chamfer.
When chamfer has been worn away, replace valve.
Valve stem runout
Measure valve stem runout.
If measurement exceeds service limit, replace valve.
Special tool
(A): 09900–20606 (Dial gauge)
(B): 09900–20701 (Magnetic stand)
(C): 09900–21304 (Steel “V” block set)
Valve stem runout
Service limit: 0.05 mm (0.0020 in.)
I9J011140040-01
(A)
(B)
“a”
“b”
I9J011140218-01
I9J011140041-01
(A)
(B)
(C)
I9J011140042-02