Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 543

6A4-54 ENGINE MECHANICAL (J20 ENGINE)
6) Using special tool (valve guide remover), drive valve guide
out from combustion chamber side to valve spring side.
Special tool
(A) : 09916-44910
NOTE:
Do not reuse valve guide once disassembled. Be sure to
use new valve guide (oversize).
7) Place disassembled parts except valve stem seal and valve
guide in order so that they can be installed in their original
positions.
INSPECTION
Valve Guides
Using a micrometer and bore gauge, take diameter readings on
valve stems and guides to check stem-to-guide clearance. Be
sure to take reading at more than one place along the length of
each stem and guide.
If clearance exceeds limit, replace valve and valve guide.
Valve and calve guide specification
Item
In
Valve stem
diameter
Ex
Valve guide In &
inside diameter Ex
In
Stem-to-guide
clearance
Ex
Valves
• Remove all carbon deposits from valves.
• Inspect each valve for wear, burn or distortion at its face and
stem, replace as necessary.
• Measure thickness of valve head. If measured thickness
exceeds limit, replace valve.
Valve head thickness
Item Standard
In 1.0 mm (0.039 in.)
Ex 1.2 mm (0.047 in.)
1. Valve head thickness
2. 45°
Standard
5.965 – 5.980 mm
(0.2349 – 0.2354 in.)
5.940 – 5.955 mm
(0.2339 – 0.2344 in.)
6.000 – 6.012 mm
(0.2363 – 0.2366 in.)
0.020 – 0.047 mm
(0.0008 – 0.0018 in.)
0.045 – 0.072 mm
(0.0018 – 0.0028 in.)
Limit
0.6 mm (0.023 in.)
0.7 mm (0.027 in.)
Limit
–
–
–
0.07 mm
(0.0027 in.)
0.09 mm
(0.0035 in.)