ENGINE MECHANICAL — Cylinder Head
EM-23
11. INSPECT AND GRIND VALVES
(a)
Grind the valve only enough to remove pits and
carbon.
(b)
Check that the valve is ground to the correct valve
face angle.
Valve face angle: 44.5°
(c)
Check the valve head margin thickness.
Standard margin thickness:
Intake
1.5 — 2.1 mm (0.059 — 0.083 in.)
Exhaust
1.7 — 2.3 mm (0.067 — 0.091 in.)
Minimum margin thickness:
Intake
1.0 mm (0.039 in.)
Exhaust 1.2 mm (0.047 in.)
If the valve head margin thickness is less than minimum,
replace the valve.
(d)
Check the valve overall length.
Standard overall length:
Intake
124.8 mm (4.913 in.)
Exhaust 128.0 mm (5.039 in.)
Minimum overall length:
Intake
124.3 mm (4.894 in.)
Exhaust 127.5 mm (5.020 in.)
If the valve overall length is less than minimum, replace
the valve.
(e)
Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, resurface the tip with a
grinder or replace the valve.
CAUTION: Do not grind off more than the minimum
overall length.
12. INSPECT AND CLEAN VALVE SEATS
(a) Using a 45° carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.
Summary of Contents for 3F-E
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