Yamaha EF1000 - Valve Seat Inspection

CYLINDER HEAD COVER, CYLINDER HEAD, VALVE
ENG
302-011
3-8
2. Inspect:
•Valve stem diameter®
Out of specification~Replace.
Valve stem diameter:
Standard:
Intake: 5.0 mm (0.2 in)
Exhaust: 5.0 mm (0.2 in)
Limit:
Intake: 4.89 mm (0.193 in)
Exhaust: 4.87 mm (0.192 in)
3. Measure:
•Valve stem bend
~ Valve stem bend limit:
v A' 0.01 mm (0.0004 in)
Out of specification~Replace.
VALVE SEAT INSPECTION
1 .Measure:
•Valve contact width ®
Poor seating ~Looping.
Out of specification~Replace.
Valve contact width:
Standard: 0.7 mm (0.03 in)
Limit: 1.2 mm (0.047 in)
2. Measure:
•Valve seat contact width®
Poor seating ~Looping.
Out of specification~Replace.
Valve seat contact width:
Standard: 0.7 mm (0.03 in)
Limit: 1.2 mm (0.047 in)
Valve/Valve Seat Assembly Lapping
1. Apply:
•Coarse lapping compound (Small amount
to
valve face)
2. Position:
•Valve
(in cylinder head)