VALVES AND VALVE SPRINGS
5-23
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
3. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
4. Check:
•Valve face
Pitting/wear → Grind the valve face.
• Valve stem end
Mushroom shape or diameter larger than
the body of the valve stem → Replace the
valve.
5. Measure:
• Valve margin thickness “a”
Out of specification → Replace the valve.
6. Measure:
• Valve stem runout
Out of specification → Replace the valve.
NOTE:
• When installing a new valve, always replace
the valve guide.
• If the valve is removed or replaced, always
replace the oil seal.
EAS24300
CHECKING THE VALVE SEATS
The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
2. Check:
•Valve seat
Pitting/wear → Replace the cylinder head.
3. Measure:
• Valve seat width “a”
Out of specification → Replace the cylinder
head.
Valve guide remover (ø4)
90890-04111
Valve guide remover (4.0 mm)
YM-04111
Valve guide installer (ø4)
90890-04112
Valve guide installer (4.0 mm)
YM-04112
Valve guide reamer (ø4)
90890-04113
Valve guide reamer (4.0 mm)
YM-04113
Valve margin thickness
Valve margin thickness D
(intake)
0.60–0.80 mm (0.0236–0.0315
in)
Limit
0.5 mm (0.02 in)
Valve margin thickness D
(exhaust)
0.60–0.80 mm (0.0236–0.0315
in)
Limit
0.5 mm (0.02 in)
Valve stem runout
Valve stem runout
0.040 mm (0.0016 in)
Valve seat width
Valve seat width C (intake)
0.90–1.10 mm (0.0354–0.0433
in)
Limit
1.6 mm (0.06 in)
Valve seat width C (exhaust)
0.90–1.10 mm (0.0354–0.0433
in)
Limit
1.6 mm (0.06 in)
To Next Page
Loading...
Need help?
General
