Subaru S209 2019, Руководство по обслуживанию

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ME-3
Cylinder Head
MECHANICAL
2. Cylinder Head
A: INSPECTION
1. VALVE SPRING
1) Check the valve springs for damage, free length
(reference), and tension. Replace the valve spring
if it is not within the standard value presented in the
table.
NOTE:
• Measurement should be performed at a temper-
ature of 20°C (68°F).
• The free length of the valve spring is described
as a reference. There is no need to replace the
valve spring if the free length of the valve spring
alone is out of standard.
2) To measure the squareness of the valve spring,
stand the valve spring on a surface plate and mea-
sure its deflection at the top of the valve spring us-
ing a try square.
B: DISPOSAL
WARNING:
• Metallic sodium is encapsulated in the ex-
haust valve. Metallic sodium is a strong alkaline
material and poses a risk of causing a severe
chemical reaction. Use great care when han-
dling and disposing it.
• If the metallic sodium gets into your eyes,
you may lose your sight. If it touches the skin,
you may get burned severely or if it touches
flame, fire may be caused by chemical reaction.
Therefore, do not disassemble the exhaust
valve.
• It is safe when the metallic sodium encapsu-
lated in the exhaust valve is not exposed to the
air.
• When the exhaust valve is broken, remove
the broken exhaust valve, and dispose of the
metallic sodium.
• Do not intentionally break the exhaust valve
and take out the metallic sodium.
• Identify the exhaust valve in which the metal-
lic sodium is encapsulated with the embossed
mark.
CAUTION:
• When disposing of the exhaust valve that is
not broken, entrust the disposal processing to
the industrial waste disposer in charge of dis-
solution treatment.
Free length
(reference) mm
(in)
Intake 53.48 (2.1055)
Exhaust 44.03 (1.7335)
Tension/
spring
height
N (kgf, lbf)/
mm (in)
Set
Intake
204.6 — 235.4
(20.86 — 24.00, 46.00
— 52.93)/36.0 (1.4173)
Exhaust
182 — 210
(18.56 — 21.41, 40.92
— 47.22)/33.0 (1.2992)
Lift
Intake
363.5 — 401.7
(37.07 — 40.96, 81.73
— 90.32)/26.7 (1.0512)
Exhaust
440 — 486
(44.87 — 49.56, 98.93
— 109.27)/22.0
(0.8661)
Squareness
Intake
2.5°, 2.3 mm (0.0906
in) or less
Exhaust
2.5°, 1.9 mm (0.0748
in) or less
ME-00283
(a) Embossed mark (Identification: ED3)
(a)
ED3
ME-21588