Subaru Impreza 2002 Service Manual page 943

MECHANICAL
(5) Compress the valve spring, and then fit the
valve spring retainer key.
(A) Retainer
(B) Painted face
(6) After installing, tap the valve spring retainers
lightly with wooden hammer for better seating.
E: INSPECTION
1. VALVE SPRING
1) Check the valve springs for damage, free length,
and tension. Replace the valve spring if it is not to
the specifications presented below.
2) To measure the squareness of valve spring,
stand the spring on a surface plate and measure its
deflection at the top using a try square.
Free length 54.30 mm (2.1378 in)
Squareness 2.5°, 2.4 mm (0.094 in)
214 — 246 N
(21.8 — 25.1 kgf, 48.1 — 55.3 lb)/
45.0 mm (1.772 in)
Tension/spring
height
526 — 582 N
(53.6 — 59.3 kgf, 118.3 — 130.8 lb)/
34.7 mm (1.366 in)
CYLINDER HEAD ASSEMBLY
B2M2634B
G2M0154
ME-66
2. INTAKE AND EXHAUST VALVE OIL
SEAL
Replace the oil seal with new one, if lip is damaged
or spring out of place, or when the surfaces of in-
take valve and valve seat are reconditioned or in-
take valve guide is replaced. Use pliers to pinch
and remove oil seal from valve.
1) Place the cylinder head on ST1.
2) Press-fit oil seal to the specified dimension indi-
cated in the figure using ST2.
CAUTION:
• Apply engine oil to oil seal before press-fit-
ting.
• When press-fitting oil seal, do not use ham-
mer or strike in.
• Differentiate between intake valve oil seal
and exhaust valve oil seal by noting their differ-
ence in color.
ST1 498267800 CYLINDER HEAD TABLE
ST2 498857100 VALVE OIL SEAL GUIDE
Color of rubber part:
Intake [Black]
Exhaust [Brown]
Color of spring part:
Intake [Silver]
Exhaust [Silver]
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 the cylinder head on ST.
ST 498267800 CYLINDER HEAD TABLE
B2M2633A