Subaru Legacy 2004 Service Manual page 1174

2) If the clearance between valve guide and stem
exceeds the standard value, replace the valve
guide or valve itself whichever shows greater
amount of wear or has abnormality such as
scratch. See the following procedure for valve
guide replacement.
Valve guide inner diameter:
6.000 — 6.012 mm (0.2362 — 0.2367 in)
Valve stem outer diameters:
Intake
5.955 — 5.970 mm (0.2344 — 0.2350 in)
Exhaust
5.945 — 5.960 mm (0.2341 — 0.2346 in)
(1) Place the cylinder head on ST1 with the
combustion chamber upward so that valve
guides fit the holes in ST1.
(2) Insert the ST2 into valve guide and press it
down to remove the valve guide.
ST1 498267600 CYLINDER HEAD TABLE
ST2 499767200 VALVE GUIDE REMOVER
ST2
(3) Turn the cylinder head upside down and
place the ST as shown in the figure.
ST 18251AA020 VALVE GUIDE ADJUSTER
(4) Before installing a new valve guide, make
sure that neither scratches nor damages exist
on the inside surface of the valve guide holes in
cylinder head.
(5) Put a new valve guide, coated with sufficient
oil, in cylinder, and insert the ST1 into valve
guide. Press-in until the valve guide upper end is
flush with the upper surface of ST2.
Cylinder Head
ST1 499767200
ST2 18251AA020 VALVE GUIDE ADJUSTER
Valve guide protrusion L:
ST 499767400
NOTE:
• Apply engine oil to the reamer when reaming.
• If the inner surface of the valve guide is torn, the
edge of the reamer should be slightly ground with
an oil stone.
• If the inner surface of the valve guide becomes
ST1
lustrous and the reamer does not chip, use a new
reamer or remedy the reamer.
ME-00128
4. INTAKE AND EXHAUST VALVE
1) Inspect the flange and stem of valve, and re-
place them if damaged, worn, deformed, or if "H" is
exceed the standard value or if they have partial
ST
wear.
H:
ME-00757
ME(H4DOTC)-63
VALVE GUIDE REMOVER
ST1
ST2
(6) Check the valve guide protrusion.
15.8 — 16.2 mm (0.622 — 0.638 in)
(7) Ream the inside of valve guide using ST.
Put the reamer in valve guide, and rotate the
reamer slowly clockwise pushing it lightly. Bring
the reamer back while rotating it clockwise. After
reaming, clean the valve guide to remove chips.
VALVE GUIDE REAMER
(8) Recheck the contact condition between
valve and valve seat after replacing the valve
guide.
Intake (A)
Standard
1.0 — 1.4 mm (0.039 — 0.055 in)
Exhaust (B)
Standard
1.3 — 1.7 mm (0.051 — 0.067 in)
MECHANICAL
ME-00130