Subaru Legacy 2004 Service Manual page 1173

MECHANICAL
1) Installation of valve spring and valve:
(1) Coat the stem of each valve with engine oil
and insert the valve into valve guide.
NOTE:
When inserting the valve into valve guide, use spe-
cial care not to damage the oil seal lip.
(2) Set the cylinder head on ST1.
(3) Install the valve spring and retainer using
ST2.
ST1 498267600 CYLINDER HEAD TABLE
ST2 499718000 VALVE SPRING REMOVER
NOTE:
Be sure to install the valve spring with their close-
coiled end facing the seat on the cylinder head.
ST2
ST1
(4) Compress the valve spring and fit the valve
spring retainer key.
(5) After installing, tap the valve spring retainers
lightly with a wooden hammer for better seating.
2) Apply oil to the surfaces of the valve lifter.
3) Install the valve lifter.
E: INSPECTION
1. CYLINDER HEAD
1) Make sure that cracks or other damages do not
exist. In addition to visual inspection, inspect impor-
tant areas by means of red lead check.
2) Measure the warping of the cylinder head sur-
face that mates with crankcase using a straight
edge (A) and thickness gauge (B).
If the warping exceeds the limit, regrind the surface
with a surface grinder.
Warping limit:
0.035 mm (0.0014 in)
Grinding limit:
0.3 mm (0.012 in)
Standard height of cylinder head:
127.5 mm (5.02 in)
Cylinder Head
NOTE:
Uneven torque for the cylinder head nuts can
cause warping. When reinstalling, pay special at-
tention to the torque so as to tighten evenly.
2. VALVE SEAT
Inspect the intake and exhaust valve seats, and
correct the contact surfaces with a valve seat cutter
if they are defective or when valve guides are re-
placed.
Valve seat width W:
Intake
Standard
ME-00124
Exhaust
Standard
3. VALVE GUIDE
1) Check the clearance between valve guide and
stem. The clearance can be checked by measuring
the outer diameter of valve stem and inner diame-
ter of valve guide respectively with a micrometer.
Clearance between the valve guide and valve
stem:
Standard
Intake
Exhaust
ME(H4DOTC)-62
0.6 — 1.4 mm (0.024 — 0.055 in)
1.2 — 1.8 mm (0.047 — 0.071 in)
0.030 — 0.057 mm (0.0012 — 0.0022 in)
0.040 — 0.067 mm (0.0016 — 0.0026 in)
(A)
(B)
ME-00126
ME-00127