- 4 -
ENGINE
- 140 -
1
、
CHECK
• al e sealing
eakage at the al e seat
Check the al e
face al e seat an al e seat wi th.
a. Pour a clean sol ent
①
into the intake an
e haust ports.
. Check that the al e seals properly. There
shoul e no leakage at the al e seat
②
.
• al e face
Pitting wear
Grin the face.
• al e stem en
Mushroom shape or iameter larger than the
o y of the stem
Replace.
• al e seats
Pitting wear
Reface the al e seat.
2
、
MEASURE:
.Measure
• The al es surface wi th
Repairing limit value
2.0mm
• stem to gui e clearance
Stem-to-guide clearance = valve guide
inside diameter – valve stem diameter
NOTE
If the mating surface is coarse, corrode or
cannot contact with valve seat normally,
replace it.
Stem-to-guide clearance
repairing limit value
Intake:0.08mm Exhaust:0.10mm
• margin thickness a
Out of specification
Replace.
Margin thickness
Intake:2 mm
Exhaust:2.2 mm
ENGINE
- 141 -
• al e stem runout
Out of specification
Replace.
Runout limit 0.01 mm
NOTE
• hen installing a ne al e al a s replace
the gui e
• f the al e is re o e or replace al a s
replace the oil seal
• The al e seat surface wi th
Out of specification
Reface the al e seat.
epairing li it alue
2.0mm
a. Install the al e into the cylin er hea .
. Press the al e through the al e gui e an
onto the al e seat to make a clear pattern.
c. Measure the al e seat wi th. here the
al e seat an al e face ma e contact
lueing will ha e een remo e .
• al e spring free length
• al e spring s uareness
Out of specification
Replace.
al e spring free length
nta e
haust
al e spring s uareness
nta e
haust
• compresse spring force a
Out of specification
Replace.
Installe length
o presse spring force
nta e
at
haust
at
. Remo e
• al e gui e
