2-2
dummyheaddummyhead
SERVICE INFORMATION
SERVICE INFORMATION
MAINTENANCE STANDARDS
ENGINE
Unit: mm (in)
Part Item Standard Service limit
Engine Idle speed (in neutral) 650 ± 50 min
-1
(rpm) –
Trolling speed 650 ± 50 min
-1
(rpm) –
Cylinder compression 1,450 – 1,690 kPa (15 – 17 kgf/cm
2
,
210 – 245 psi) at 200 min
-1
(rpm)
–
Ignition timing At idle 0° at 650 min
-1
(rpm) –
Spark plugs Gap Standard 1.00 – 1.10 (0.039 – 0.043) –
Optional 1.00 – 1.10 (0.039 – 0.043) 1.30 (0.051)
Valves Valve clearance IN 0.20 – 0.24 (0.008 – 0.009) –
EX 0.28 – 0.32 (0.011 – 0.013) –
Stem O.D. IN 5.485 – 5.495 (0.2159 – 0.2163) 5.455 (0.2148)
EX 5.450 – 5.460 (0.2146 – 0.2150) 5.420 (0.2134)
Guide I.D. IN/EX 5.515 – 5.530 (0.2171 – 0.2177) 5.55 (0.219)
Guide extrusion amount IN 21.20 – 22.20 (0.835 – 0.874) –
EX 20.63 – 21.63 (0.812 – 0.852) –
Stem-to-guide
clearance
IN 0.020 – 0.045 (0.0008 – 0.0018) 0.080 (0.0032)
EX 0.055 – 0.080 (0.0022 – 0.0032) 0.120 (0.0047)
Seat width IN/EX 1.25 – 1.55 (0.049 – 0.061) 2.0 (0.08)
Seat installation height IN 46.75 – 47.55 (1.841 – 1.872) 47.80 (1.882)
EX 46.68 – 47.48 (1.838 – 1.869) 47.73 (1.879)
Spring free length IN 51.32 (2.020) –
EX 53.48 (2.106) –
Rocker arms Rocker arm I.D. IN 20.019 – 20.039 (0.7881 – 0.7889) –
EX 20.019 – 20.049 (0.7881 – 0.7893) –
Rocker arm shaft O.D. IN/EX 19.972 – 19.993 (0.7863 – 0.7871) –
Rocker arm-to-rocker
arm shaft clearance
IN 0.026 – 0.067 (0.0010 – 0.0026) 0.067 (0.0026)
EX 0.026 – 0.077 (0.0010 – 0.0030) 0.077 (0.0030)
Pistons Skirt O.D. 88.974 – 88.984 (3.5029 – 3.5033) 88.964 (3.5025)
Piston-to-cylinder clearance 0.016 – 0.041 (0.0006 – 0.0016) 0.080 (0.0032)
Pin bore I.D. 21.960 – 21.963 (0.8646 – 0.8647) –
Pin O.D. 21.961 – 21.965 (0.8646 – 0.8648) 21.954 (0.8643)
Pin-to-pin bore clearance –0.005 – +0.002
(–0.0002 – +0.0001)
0.004 (0.0002)
Ring groove width Top/Second 1.220 – 1.230 (0.0480 – 0.0484) 1.25 (0.049)
Oil 2.805 – 2.825 (0.1104 – 0.1112) 2.85 (0.112)
Piston rings Ring side clearance Top 0.035 – 0.060 (0.0014 – 0.0024) 0.13 (0.005)
Second 0.030 – 0.055 (0.0012 – 0.0022) 0.13 (0.005)
Ring end gap Top 0.20 – 0.35 (0.008 – 0.014) 0.6 (0.02)
Second 0.40 – 0.55 (0.016 – 0.022) 0.7 (0.03)
Oil 0.20 – 0.70 (0.008 – 0.028) 0.8 (0.03)
Ring thickness Top 1.170 – 1.185 (0.0461 – 0.0467) –
Second 1.175 – 1.190 (0.0463 – 0.0469) –
Cylinder head Warpage – 0.05 (0.002)
Camshaft journal I.D. 43.000 – 43.024 (1.6929 – 1.6939) –
Head height 120.95 – 121.05 (4.762 – 4.766) –
Cylinder head bolt/washer O.D. 11.3 (0.44) –
Cylinder block Cylinder sleeve I.D. 89.000 – 89.015 (3.5039 – 3.5045) 89.065 (3.5065)
Warpage 0.07 (0.003) Max. 0.10 (0.004)
Difference between upper and lower parts
of sleeve I.D.
– 0.05 (0.002)
Difference between upper and lower parts
of connecting rod bolt O.D.
0 – 0.10 (0 – 0.004) –
Connecting rods Small end I.D. 21.970 – 21.976 (0.8650 – 0.8652) –
Small end-to-piston pin clearance 0.005 – 0.015 (0.0002 – 0.0006) 0.019 (0.0007)
Big end axial clearance 0.15 – 0.35 (0.006 – 0.014) 0.45 (0.018)
Connecting rod big end oil clearance 0.020 – 0.044 (0.0008 – 0.0017) 0.05 (0.002)
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