
CYLINDER HEAD ASSEMBLY
EM -35
REPLACING THE VALVE SEAT RING
1.
Cut away the inner face of the valve seat to reduce
the wall thickness.
0.3 - 0.6 mm
(0.0118 - 0.0236 in.)
0.3 mm (0.012 in. R)
0.15 - 0.3 mm
(0.006 - 0.0118 in.)
Old hole
A
B
Remove
D
∅
New hole
H
ECA9281F
2.
Enlarge the diameter of the valve seat so that it
matches the specified oversize hole diameter of the
new valve seat ring.
3.
Heat the cylinder head to about 250 C (480 F) and
press - fit an oversize seat ring for the bore in the
cylinder head.
4.
Using lapping compound, lap the valve to the new
seat.
Valve seat contact width
Intake : 0.8 ~ 1.2 mm (0.0315 ~ 0.0472 in.)
Exhaust : 1.3 ~ 1.7 mm (0.0512 ~ 0.0670 in.)
VALVE SEAT INSERT OVERSIZES
Description
Size mm (in.)
Size
mark
Seat ring height H
mm (in.)
Oversize hole diameter
I.D. mm (in.)
0.3 (0.012) O.S.
30
5.1~5.3(0.2008~0.2087)
30.7~30.721 (1.2087~1.2095
Intake valve
Seat ring
0.6 (0.024) O.S.
60
5.4~5.6(0.2126~0.2205)
31.0~31.021(1.2205~1.2213)
0.3 (0.012) O.S.
30
6.2~6.4(0.2441~0.2520)
27.3~27.321(1.0748~1.0756)
Exhaust valve
Seat ring
0.6 (0.024) O.S.
60
6.5~6.7(0.2560~0.2638)
27.6~27.621(1.0866~1.0874)
REPLACING VALVE GUIDE
1.
Using the special tool (09221-3F100 A/B), withdraw
the old valve guide toward the bottom of cylinder head.
2.
Recondition the valve guide hole so that it can match
the newly press-fitted oversize valve guide.
Valve guide
Valve guide installer
(09221-3F100A)
Cylinder head
Valve guide installer
(09221-3F100B)
Valve guide installer
adapter
14mm (0.5512 in.)
ECDE109C
ZENITH POWER PRODUCTS - 416
Содержание ZPP 416
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