Shibaura N843 - Page 72

7-4 109823 2/09
Valve System
Valve
Diameter of intake valve stem 0.2744
(6.97)
0.2744
(6.97)
0.2738–0.2744
(6.955–6.97)
0.2738–0.2744
(6.955–6.97)
0.2713
(6.89)
0.2713
(6.89)
Diameter of exhaust valve
stem
0.2738
(6.955)
0.2738
(6.955)
0.2732–0.2738
(6.94–6.955)
0.2732–0.2738
(6.94–6.955)
0.2693
(6.84)
0.2693
(6.84)
Clearance
between valve
stem and valve
guide
Intake 0.0012–0.0024
(0.03 – 0.06)
0.0012–0.0024
(0.03 – 0.06)
More than
0.0079
(0.2)
More than
0.0079
(0.2)
Exhaust 0.0018–0.0030
(0.045–0.075)
0.0018–0.0030
(0.045–0.075)
More than
0.0100
(0.25)
More than
0.0100
(0.25)
0.039(1.0) 0.039(1.0) 0.0305–0.0423
(0.775–1.075)
0.0315–0.0433
(0.8- 1.1)
0.02
(0.5)
0.02
(0.5)
Valve clearance
(Intake/exhaust)
0.008(0.2) 0.008(0.2) 0.02(0.5)
Valve spring Spring
force
lb
f
(N){kgf}
(Com-
pressed to
1.20(30.4)
mounting
length)
17.9(79.8){8.1} 17.9(79.8){8.1} 15.4(68.6)
{7}
15.4(68.6)
{7}
Free length 1.4(35) 1.4(35) 1.32
(33.5)
1.32
(33.5)
Less than
0.047(1.2)
Less than
0.047(1.2)
0.08
(2.0)
0.08
(2.0)
Push Rod
Overall length 6.86(174.3) 7.00(177.8) 6.85–6.87
(174.1–174.5)
6.99–7.01
(177.6–178.0)
Outer diameter 0.25(6.3) 0.25(6.3)
Rocker
Arm
Wear, rocker arm shaft 0.46(11.7) 0.589(14.96) 0.4587–0.4594
(11.650–11.668)
0.5886–0.5894
(14.95–14.97)
0.4555
(11.57)
0.5854
(14.87)
Clearance between rocker
arm and shaft
0.0013–.00268
(0.032–0.068)
0.00126–.0027
(0.032–0.068)
0.0079
(0.2)
0.0079
(0.2)
Oil clearance
Unit Part Inspection Items
Standard Dimension Standard Value
To be
Repaired
Allowable Limit
S773L N843(L) S773L N843(L) S773L N843(L) Remarks