Subaru 2002 IMPREZA Service Manual page 1111

(8) Recheck the contact condition between
valve and valve seat after replacing the valve
guide.
4. INTAKE AND EXHAUST VALVE
1) Inspect the flange and stem of valve, and re-
place if damaged, worn, or deformed, or if "H" is
less than the specified limit.
H:
Intake
Standard
1.2 mm (0.047 in)
Limit
0.8 mm (0.031 in)
Exhaust
Standard
1.5 mm (0.059 in)
Limit
0.8 mm (0.031 in)
Valve overall length:
Intake
104.4 mm (4.110 in)
Exhaust
104.7 mm (4.122 in)
2) Put a small amount of grinding compound on the
seat surface and lap the valve and seat surface. In-
stall a new intake valve oil seal after lapping.
CYLINDER HEAD ASSEMBLY
G2M0153
ME(TURBO)-69
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 valve spring,
stand the spring on a surface plate and measure its
deflection at the top using a try square.
Valve spring
Free length 44.67 mm (1.7587 in)
205.0 — 236.4 N
(20.9 — 24.1 kgf, 46.1 — 53.1 lb)
/36.0 mm (1.417 in)
Tension/spring
height
485.4 — 536.4 N
(49.5 — 54.7 kgf, 109.2 — 120.6 lb)
/26.6 mm (1.047 in)
Squareness 2.5°, 2.0 mm (0.079 in)
MECHANICAL
G2M0154