Subaru Legacy 2002 Service Manual page 1079

Mechanical
Standard:
0.019 — 0.057 mm (0.0007 — 0.0022 in)
Limit:
0.100 mm (0.0039 in)
F: ADJUSTMENT
1. CYLINDER HEAD
1) Make sure that no crack or other damage
exists. In addition to visual inspection, inspect
important areas by means of red lead check.
Also make sure that gasket installing surface
shows no trace of gas and water leaks.
2) Place cylinder head on ST.
ST 18250AA000 CYLINDER HEAD TABLE
3) Measure the warping of the cylinder head sur-
face that mates with crankcase using a straight
edge and thickness gauge.
If the warping exceeds 0.05 mm (0.0020 in),
regrind the surface with a surface grinder.
Warping limit:
0.05 mm (0.0020 in)
Grinding limit:
0.1 mm (0.004 in)
Standard height of cylinder head:
124 mm (4.88 in)
CAUTION:
Uneven torque for the cylinder head bolts can
cause warping. When reassembling, pay spe-
cial attention to the torque so as to tighten
evenly.
(A) Straight edge
(B) Thickness gauge
2. VALVE SEAT
S143093A0102
Inspect intake and exhaust valve seats, and cor-
rect the contact surfaces with valve seat cutter if
they are defective or when valve guides are
replaced.
CYLINDER HEAD ASSEMBLY
S143093A01
S143093A0101
B2M4074A
ME(H6)-58
Valve seat width: W
Intake
Standard
1.0 mm (0.039 in)
Limit
1.7 mm (0.067 in)
Exhaust
Standard
1.5 mm (0.059 in)
Limit
2.2 mm (0.087 in)
3. VALVE GUIDE
S143093A0103
1) Check the clearance between valve guide and
stem. The clearance can be checked by measur-
ing the outside diameter of valve stem and the
inside diameter of valve guide with outside and
inside micrometers respectively.
Clearance between the valve guide and valve
stem:
Standard
Intake
0.030 — 0.057 mm (0.0012 — 0.0022 in)
Exhaust
0.040 — 0.067 mm (0.0016 — 0.0026 in)
Limit
0.15 mm (0.0059 in)
2) If the clearance between valve guide and stem
exceeds the limit, replace valve guide or valve
itself whichever shows greater amount of wear.
See following procedure for valve guide replace-
ment.
Valve guide inner diameter:
5.500 — 5.512 mm (0.2165 — 0.2170 in)
Valve stem outer diameter:
Intake
5.455 — 5.470 mm (0.2148 — 0.2154 in)
Exhaust
5.455 — 5.460 mm (0.2148 — 0.2150 in)
(1) Place cylinder head on ST1 with the com-
bustion chamber upward so that valve guides
enter the holes in ST1.
G2M0761