Suzuki Liana RH418, Supplementary Service Manual

Page: 169 / 371

Engine Mechanical: 1D-43
• 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
continuous ring without any break, and the width of
pattern must be within specified range.
Standard seating width “a” revealed by contact
pattern on valve face
Intake and Exhaust: 1.0 – 1.4 mm (0.0389 – 0.0551
in.)
• 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.
a.
Exhaust valve seat:
Use valve seat cutters (1) to make two cuts as
illustrated in the figure. Two cutters must be used:
the first for making 22
°
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”: 1.0 – 1.4 mm (0.0389 – 0.0551 in.)
b. Intake valve seat:
Use valve seat cutters (1) to make four cuts as
illustrated in figure. Four cutters must be used: the
1st for making 75
°
angle, the 2nd for making 22
°
angle, the 3rd for making 60
°
angle, and the 4th
for making 45
°
angle. The 4th cut (45
°
) must be
made to produce desired seat width.
Seat width for intake valve seat
“b”: 1.0 – 1.4 mm (0.0389 – 0.0551 in.)
c. Valve lapping:
Lap valve on seat in two steps, first with coarse
size lapping compound applied to face and the
second with fine-size compound, each time using
valve lapper according to usual lapping method.
Cylinder Head Inspection
S3RH0B1406027
• 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.
I2RH0B140103-01
I3RH0B140046-01
I2RH0B140105-01