ENGINE OVERHAUL
28
29
30
c.
After installation, ream the valve guide with its reamer "3" to get
the correct valve stem - valve guide clearance.(see fig. 28)
• After replacing the valve guide, grind the valve seat.
3.
to delete:
• Scale deposits (from valve face and seat)
4.
Check:
• Valve face
Pittings/wear
Ream valve face.
• Valve stem end
•
Mushroom shape or diameter greater than the valve stem
Replace the valve.
5.
measure:
• D valve edge thickness "a" (see fig. 29)
Not conforming to specifications
•
(Intake) valve edge thickness D
0.50-0.90 mm (0.0197-0.0354 in)
•
(Exhaust) valve edge thickness D
0.50-0.90 mm (0.0197-0.0354 in)
6.
measure:
• Valve stem misalignment
Not conforming to specifications
• When a new valve is installed, always replace the valve gui-
de.
• If a valve is removed or replaced, always replace the valve
stem seal.
•
Valve stem misalignment
0.010 mm (0.0004 in)
F1.18
Replace the valve.
Replace the valve.
Part. N. 8000 H4704 (07-2010)