Suzuki 2000 Grand Vitara SQ625 Service Manual page 289

D 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 cutters to make two
1. Valve seat cutter
2) INTAKE VALVE SEAT: Cutting sequence is the same as for ex-
3) VALVE LAPPING: Lap valve on seat in two steps, first with
1. Valve seat
Cylinder Head
D Remove all carbon from combustion chambers.
NOTE:
Do not use any sharp-edged tool to scrape off carbon. Be
careful not to scuff or nick metal surfaces when
decarboning. The same applies to valves and valve seats,
too.
D Check cylinder head for cracks in intake and exhaust ports, com-
bustion chambers, and head surface.
cuts as illustrated in figure. Two cutters must be used: the first
for making 15_ angle, and the second for making 45_ angle.
The second cut must be made to produce desired seat width.
Seat width for exhaust valve seat:
1.1 – 1.3 mm (0.0433 – 0.0512 in.)
haust valve seats.
Seat width for intake valve seat:
1.1 – 1.3 mm (0.0433 – 0.0512 in.)
coarse size lapping compound applied to face and the second
with fine-size compound, each time using valve lapper accord-
ing to usual lapping method.
ENGINE MECHANICAL (G16 ENGINE) 6A1-47