Suzuki Jimny Service Manual page 536

• 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 (1) to make
two 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
"a" : 1.1 – 1.3 mm (0.0433 – 0.0512 in.)
2) INTAKE VALVE SEAT: Use valve seat cutters to make three
cuts as illustrated in figure. Three cutters must be used: the
1st for making 15° angle, the 2nd for making 60° angle, and
3rd for making 45° angle. The 3rd cut (45°) must be made to
produce desired seat width.
Seat width for intake valve seat
"b" : 1.1 – 1.3 mm (0.0433 – 0.0512 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 decarboning. The same applies to valves and valve
seats, too.
ENGINE MECHANICAL (M13 ENGINE) 6A1-55