2-2
dummyheaddummyhead
SERVICE INFORMATION
SERVICE INFORMATION
MAINTENANCE STANDARDS
ENGINE
Unit: mm (in)
Part Item Standard Service limit
Engine Idle speed (in neutral) 750 ± 50 min
-1
(rpm) –
Trolling speed 650 – 1,000 min
-1
(rpm) –
Cylinder compression 1.45 – 1.65 MPa
(14.8 – 16.8 kgf/cm
2
, 211 – 239 psi)
at 300 min
-1
(rpm)
0.93 MPa
(9.5 kgf/cm
2
, 135 psi)
Compression gap between cylinders – 0.2 MPa
(2.0 kgf/cm
2
, 28 psi)
Spark plugs Gap Standard 0.80 – 0.90 (0.031 – 0.035) –
Optional 1.00 – 1.10 (0.039 – 0.043) 1.30 (0.051)
Valves Valve clearance IN 0.15 – 0.19 (0.006 – 0.007) –
EX 0.26 – 0.30 (0.010 – 0.012) –
Stem O.D. IN 5.480 – 5.490 (0.2157 – 0.2161) 5.450 (0.2146)
EX 5.450 – 5.460 (0.2146 – 0.2150) 5.420 (0.2134)
Overall length IN 118.55 – 119.15 (4.667 – 4.691) –
EX 117.25 – 117.85 (4.616 – 4.640) –
Valve O.D IN 27.85 – 28.15 (1.096 – 1.108) –
EX 22.85 – 23.15 (0.900 – 0.911) –
Stem-to-guide
clearance
IN 0.020 – 0.050 (0.0008 – 0.0020) 0.080 (0.0032)
EX 0.050 – 0.080 (0.0020 – 0.0032) 0.110 (0.0043)
Valve seats Seat width IN 0.85 – 1.15 (0.033 – 0.045) 1.60 (0.063)
EX 1.25 – 1.55 (0.049 – 0.061) 2.00 (0.079)
Seat installation height IN 46.0 – 46.6 (1.81 – 1.83) 46.9 (1.85)
EX 46.1 – 46.7 (1.81 – 1.84) 47.0 (1.85)
Valve guides Guide I.D. IN/EX 5.51 – 5.53 (0.217 – 0.218) 5.55 (0.219)
Guide installation height IN/EX 15.85 – 16.35 (0.624 – 0.644) –
Valve springs Free length IN 48.54 (1.911) –
EX 55.29 (2.177) –
Rocker arms Rocker arm I.D. IN/EX 20.012 – 20.030 (0.7879 – 0.7886) –
Rocker arm shaft O.D. 19.972 – 19.993 (0.7863 – 0.7871) –
Rocker arm-to-rocker
arm shaft clearance
IN/EX 0.019 – 0.058 (0.0007 – 0.0023) 0.080 (0.0032)
Pistons Skirt O.D. 72.98 – 72.99 (2.873 – 2.874) 72.97 (2.873)
Piston-to-cylinder clearance 0.01– 0.04 (0.0004 – 0.0016) 0.05 (0.0020)
Pin bore I.D. 18.010– 18.014 (0.7091 – 0.7092) –
Ring groove width Top 1.050 – 1.060 (0.0413 – 0.0417) –
Second 1.220 – 1.230 (0.0480 – 0.0484) –
Oil 2.005 – 2.020 (0.0789 – 0.0795) –
Piston pins Pin O.D. 17.996 – 18.000 (0.7085 – 0.7087) –
Pin-to-pin bore clearance 0.010 – 0.018 (0.0004 – 0.0007) 0.020 (0.0008)
Piston rings Ring side clearance Top 0.065 – 0.090 (0.0026 – 0.0035) 0.150 (0.0059)
Second 0.030 – 0.055 (0.0012 – 0.0022) 0.130 (0.0051)
Ring end gap Top 0.15 – 0.30 (0.006 – 0.012) 0.60 (0.024)
Second 0.35 – 0.50 (0.014 – 0.020) 0.65 (0.026)
Oil 0.20 – 0.70 (0.008 – 0.028) 0.80 (0.031)
Ring thickness Top 0.970 – 0.985 (0.0382 – 0.0388) –
Second 1.175 – 1.190 (0.0463 – 0.0469) –
Cylinder head Warpage 0.08 (0.003) Max. 0.08 (0.003) Min.
Camshaft journal I.D. 41.995 – 42.019 (1.6533 – 1.6543) –
Head height 119.9 – 120.1 (4.72 – 4.73) –
Cylinder block Cylinder sleeve I.D. 73.00 – 73.02 (2.874 – 2.875) 73.07 (2.877)
Difference between top and bottom
points of sleeve I.D.
– 0.05 (0.002)
Warpage 0.07 (0.003) Max 0.10 (0.004)
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