Maintenance - TOHATSU BFT250A Service Manual

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