ME(H4SO)-64
MECHANICAL
Cylinder Head Assembly
1) Installation of valve spring and valve
(1) Place the cylinder head on ST.
ST 498267800 CYLINDER HEAD TABLE
(2) Coat the stem of each valve with engine oil
and insert valve into valve guide.
NOTE:
When inserting the valve into valve guide, use spe-
cial care not to damage the oil seal lip.
(3) Install the valve spring and retainer.
NOTE:
Be sure to install the valve springs with their close-
coiled end facing the seat on the cylinder head.
(4) Set the ST on valve spring.
ST 499718000 VALVE SPRING REMOVER
(5) Compress the valve spring, and then fit the
valve spring retainer key.
(6) After installing, tap the valve spring retainers
lightly with plastic 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.
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 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]
(A) Retainer key
(B) Valve spring
ME-00280
ST
ME-00282
(B)
(B)
(A)
Free length 54.30 mm (2.1378 in)
Squareness 2.5°, 2.4 mm (0.094 in)
Tension/spring
height
Set
214 — 246 N
(22 — 25 kgf, 48 — 55 lb)/
45.0 mm (1.772 in)
Lift
526 — 582 N
(54 — 59 kgf, 119 — 130 lb)/
34.7 mm (1.366 in)
ME-00283
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