Subaru 2002 IMPREZA Service Manual page 176

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MECHANICAL
Free length
CYLINDER HEAD ASSEMBLY
44.67 mm (1.7587 in)
220.7t15.7 N
5. VALVE SPRINGS
1) Check the valve springs for damage, free length,
and tension. Replace the valve spring if it is not
within specifications presented in the table.
2) To measure the squareness of the valve spring,
stand the spring on a surface plate and measure its
deflection at the top using a try square.
I 1
Valve spring
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Tensiontspring
height
(22.5 f 1.6 kgf, 49.6f3.5 lb)/36.0 mm
(1.41 7 in)
51 0.9f25.5
N
(52.1f2.6 kgf, 114.9f5.7 lb)/26.6 mm
(1.047 in)
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Squareness
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2.5", 2.0 mm (0.079 in)
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6. INTAKE AND EXHAUST VALVE
O I L
SEAL
Replace the oil seal with a new one, if the lip is
damaged or spring out of place, or when the surfac-
es of intake valve and valve seat are reconditioned
or intake valve guide is replaced.
1) Place the cylinder head on ST1.
2) Press in the oil seal to the specified dimension
indicated in the figure by using ST2.
ST1 498267600 CYLINDER HEAD TABLE
ST2 498857100 VALVE GUIDE REMOVER
CAUTION:
Apply engine oil to oil seal before force-fit-
ting.
Differentiate between the intake valve oil seal
and exhaust valve oil seal by noting their differ-
ence in color.
Color of rubber part:
Intake [Black]
Exhaust [Brown]
Color of spring part:
Intake [Silver]
Exhaust [Silver]
S2M1924A
ME(D0HC TURBO)-70