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Mechanical Part of
Engine
Standard values:
For intake valve: 53.21mm
For exhaust valve: 54.10mm
Limits:
For intake valve: 53.71mm
For exhaust valve: 54.60mm
■
Renew valve seat.
a.
Before renewing the valve seat, check the clearance between valve guide and valve. Replace the
valve guide if necessary.
b.
Resurfacing the valve seat by the proper special tool or the valve seat grinder till specified seat
surface width and angle are met.
c.
After renewing the valve seat, grind the valve and the valve seat by the grinding cream. Then, check
the protrusion height of valve stem (refer to the above mentioned check steps of valve seat)
■
Replacement of Valve Seat
a.
Cut away the replaced valve seat from its
inner side in order to decrease the wall
thickness. Then remove the valve seat.
b.
Rebore the valve seat hole on cylinder head
till the hole matches the selected valve seat
with a extended diameter. See “Parameters
for Maintenance” for the detailed size.
c.
Do not have the cylinder head hole scratched
by the valve seat cooled by the liquid nitrogen
before it is pressed.
d.
Renew the valve seat till its width and angle
meet the specifications (see the operation
instruction of valve seat correction).
e.
leak
testing
must
be
conducted
for
disassembly of valve related components.
Fig.1.1.049
Fig.1.1.050
Fig.1.1.051
End Face of
Valve Stem
Valve Protrusion
Height
Surface of Valve
Spring Seat
Cut Away
Valve Seat
Height
Inner Diameter of Extended Hole
