Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE MECHANICAL (J20 ENGINE) 6A4-55
• Inspect valve stem end face for pitting and wear. If pitting or
wear is found there, valve stem end may be resurfaced, but
not too much to grind off its chamber. When it is worn out too
much that its chamber is gone, replace valve.
• Check each valve for radial runout with a dial gauge and “V”
block. To check runout, rotate valve slowly. If runout exceeds
its limit, replace valve.
Limit on valve head radial runout
0.08 mm (0.003 in.)
• Seating contact width :
Create contact pattern on each valve in the usual manner,
i.e. by giving uniform coat of marking compound to valve
seat and by rotatingly tapping seat with valve head. Valve
lapper (tool used in valve lapping) must be used.
Pattern produced on seating face of valve must be a continu-
ous ring without any break, and the width of pattern must be
within specified range.
Standard seating width revealed by contact pattern on
valve face
Intake and exhaust : 1.1 – 1.3 mm (0.0433 – 0.0511 in.)