1-10 GENERAL INFORMATION
VALVE / VALVE GUIDE
36 (1.4)
mm (in)
IN
Valve clearance
(when cold)
mm (in)
Valve diameter
STD
STD
mm (in)
mm (in)
STD
Limit
mm (in)
0.045 – 0.075 (0.0018 – 0.0030)
mm (in)
STD
Limit
0.090 (0.0035)
mm (in)
IN,EX
mm (in)
STD
7.000 – 7.015 (0.2756 – 0.2762)
Item
Unit
Data
DF60T
DF70(W)T/70WTH
30 (1.2)
mm (in)
EX
IN
EX
0.11 – 0.15 (0.004 – 0.006)
0.13 – 0.17 (0.005 – 0.007)
0.020 – 0.050 (0.0008 – 0.0020)
0.070 (0.0028)
IN
EX
Valve guide to
valve stem
clearance
Valve guide
inside diameter
IN,EX
mm (in)
STD
14.0 (0.55)
Valve guide
protrusion
Valve stem
outside diameter
mm (in)
STD
STD
mm (in)
IN
EX
6.965 – 6.980 (0.2742 – 0.2748)
6.940 – 6.955 (0.2732 – 0.2738)
IN,EX
mm (in)
Limit
6.05 (0.238)
Valve stem end
length
Valve stem end
deflection
mm (in)
Limit
Limit
mm (in)
IN
EX
0.14 (0.006)
0.18 (0.007)
IN,EX
mm (in)
Limit
0.05 (0.002)
Valve stem runout
IN,EX
mm (in)
Limit
0.08 (0.003)
Valve head
radial runout
Valve head
thickness
mm (in)
STD
Limit
mm (in)
1.0 (0.04)
0.6 (0.02)
mm (in)
Limit
0.7 (0.03)
Valve seating
contact width
STD
mm (in)
IN,EX
1.3 – 1.5 (0.05 – 0.06)
Valve spring free
length
49.3 (1.94)
mm (in)
STD
48.1 (1.89)
mm (in)
Limit
Valve spring tension
24.8 – 29.2 (54.7 – 64.3) for 41.5 mm (1.63 in)
kg (Ibs)
STD
22.8 (50.2) for 41.5 mm (1.63 in)
kg (Ibs)
Limit
Valve spring
sequareness
2.0 (0.08)
mm (in)
Limit
IN,EX
IN
EX
Содержание DF 60
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Страница 282: ...Prepared by Marine Power Products Division 1st Ed September 2002 Manual No 99500 99E10 01E Printed in Japan 284 ...
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