Suzuki Wagon R Manual page 3883

6A4-56 ENGINE MECHANICAL (Z10XEP AND Z12XEP ENGINES)
Valves
Visual inspection
• Remove all carbon from valves.
• Inspect each valve for wear, burn or distortion at its face and
stem end, as necessary, replace it.
• 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.
Valve seat repair
A valve seat not producing a uniform contact with its valve or
showing width of seating contact that is out of specified range
must be repaired by regrinding or by cutting and regrinding and
finished by lapping.
1) EXHAUST VALVE SEAT: Use valve seat cutter (1) to make
cut as illustrated in figure. The cut must be made to produce
desired seat width.
Seat width for exhaust valve seat
"a": 1.4 – 1.8 mm (0.0551 – 0.0708 in.)
2) INTAKE VALVE SEAT: Use valve seat cutter (1) to make cut
as illustrated in figure. The cut must be made to produce
desired seat width.
Seat width for intake valve seat
"a": 1.0 – 1.4 mm (0.0389 – 0.0551 in.)
3) VALVE LAPPING: Lap valve on seat in two steps, first with
coarse size lapping compound applied to face and the sec-
ond with fine-size compound, each time using valve lapper
according to usual lapping method.
Cylinder head
• Remove all carbon deposits from combustion chambers.
NOTE:
Do not use any sharp-edged tool to scrape off carbon
deposits. Be careful not to scuff or nick metal surfaces
when decarbonizing. The same applies to valves and
valve seats, too.