Yamaha EF2000iS - Inverter Generator, Service Manual

Page: 260 / 312

7-5
SPEC
MAINTENANCE SPECIFICATIONS
Valve: mm (in)
Valve
Face diameter “A” IN 20.0 (0.79)
EX 18.0 (0.71)
Stem diameter “B” IN 4.948 – 4.960 (0.1948 – 0.1953)
EX 4.928 – 4.940 (0.1940 – 0.1945)
<Limit> IN 4.908 (0.19)
EX 4.908 (0.19)
Stem length “C” IN 53.0 (2.09)
EX 53.2 (2.09)
Valve face contact
width “D”
IN 0.6 – 0.8 (0.0236 – 0.0315)
EX 0.6 – 0.8 (0.0236 – 0.0315)
<Limit> IN 1.6 (0.06)
EX 1.6 (0.06)
Valve seat contact width IN 0.6 – 0.8 (0.0236 – 0.0315)
EX 0.6 – 0.8 (0.0236 – 0.0315)
<Limit> IN 1.6 (0.06)
EX 1.6 (0.06)
Valve stem runout limit 0.01 (0.0004)
“ θ ” 91°
Valve guide
Guide inside diameter IN 5.000 – 5.012 (0.1969 – 0.1973)
EX 5.000 – 5.012 (0.1969 – 0.1973)
Stem to guide clearance IN 0.040 – 0.064 (0.00157 – 0.00252)
EX 0.060 – 0.084 (0.00236 – 0.00331)
Valve clearance (cold) IN 0.07 – 0.12 (0.0028 – 0.0047)
EX 0.07 – 0.12 (0.0028 – 0.0047)
Push rod: mm (in)
Runout limit 0.5 (0.02)
Valve spring: mm (in)
Free length IN 27.4 (1.0787)
EX 27.4 (1.0787)
<Limit> IN 24.4 (0.94)
EX 24.4 (0.94)
Set length IN 21.6 (0.8504)
EX 21.6 (0.8504)
Set force IN 4.4 kg (2.7 lb)
EX 4.4 kg (2.7 lb)
Tilt limit 0.8 (0.03)
7DK40-07 6/15/09 3:01 PM Page 5