Yanmar 3TNV Series Service Manual page 93

4. Disassembly, Inspection and Reassembly of Engines
(3) Intake/exhaust valve
Mainly clean and check damage and wear at the valve stem and seat.
(a) Seat contact: See (1)-(d) above.
(b) Stem outside diameter: See (2) above.
(c) Valve head thickness
Model Part
Intake
TNV82A 88
Exhaust
Intake
4TNE94 95
Exhaust
Intake
4TNE106(T)
Exhaust
(d) Valve stem bend
Limit 0.01
(e) Overall length
3TNV82A Intake/Exhaust
TNV84 88 Intake/Exhaust
4TNV94 98 Intake/Exhaust
4TNV106(T) Intake/Exhaust
(4) Valve spring
Mainly inspect damage and corrosion.
Free length standard
3TNV82A 44.4?
TNV84 88 42.0?
4TNV94 98
4TNV106(T)
Standard
1.34
1.45
1.71
1.65
2.00
2.00
mm
Standard
?
115
126
Inclination limit
1.2
47.5
1.2
50.6
mm
Limit
0.50
0.50
1.00
1.00
1.30
1.30
mm
Limit
114.5
125.5
mm
78