6-16 POWER UNIT
Valve guide inside diameter
Standard: IN & EX 5.500 – 5.512 mm (0.2165 – 0.2170 in)
If unable to measure valve guide inside diameter, measure the
“Valve stem deflection”.
Valve stem deflection
Measure valve stem deflection as follows:
1. Install the valve into valve guide.
2. Position the valve head at approx. 10 mm away from valve
seat.
3. Move valve head in the direction “X – Y”, and measure
deflection.
09900-20602: Dial gauge
09900-20701: Magnetic stand
Service limit: IN & EX 0.16 mm (0.006 in)
If measurement exceeds service limit, replace valve.
If measurement still exceeds service limit with new valve,
replace valve guide.
NOTE:
For valve guide replacement, see “VALVE GUIDE REPLACE-
MENT” section on page 6-18.
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 guide
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