Tohatsu MFS 4 [7/81] Chapter 2 service data and tools
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Tohatsu MFS 4 [7/81] Chapter 2 service data and tools

Tohatsu MFS 6 B [7/81] Chapter 2 service data and tools

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CHAPTER 2 SERVICE DATA AND TOOLS 1 Service Data and Maintenance Standards Description Check Item Standard value Carbon deposit on the combustion chamber Cylinder head Distortion of the mounting surface Corrosion in the mated surface Clogging cooling water passage Deposit in the water jacket Wear out of the inside diameter Measure the bore with a cylinder gauge 59 00 mm 2 323 in Seizure Cylinder Scratch and wearing down in the cylinder liner Mating surfaces of the cylinder and cylinder headPiston Engine related Items Outside diameter Measure the diameter at a point 7 mm above the lower end of the piston skirt Piston clearanc Diameter 58 960 mm 2 3213 in Piston clearance 0 020 0 055 mm 0 0008 0 0022 In Carbon deposit on the piston crown and in the piston ring groove Scratch on the sliding surface Piston Piston pin Top 0 04 0 08 mm 0 0016 0 031 in Measurement of clearance between the Second 0 03 0 07 mm 0 0012 0 0028 in piston ring and ring groove Oil 0 01 0 18 mm 0 0004 0 0071 in Clearance between pin and hole Measurement of diameter of the piston pin Loose 0 002 0 012 mm hole 0 00008 0 00047 in End gap Note Top 0 15 0 35 mm Measurement of the end gap Top 0 0059 0 0138 in When no ring gauge is Second 0 30 0 50 mm available measure the lower Second 0 0118 0 0197 in part of the cylinder bore that is Oil 0 20 0 40 mm not so worn down Oil 0 0079 0 0157 In Outer diameter 16 00 mm 0 63 in Crank shaft Deflection of the crank shaft Both the main bearings of the crank shaft should be supported on V blocks Piston ring Connecting rod Oil pan Less than 0 05 mm 0 002 in Both ends Outer diameter of the crank pin Outer diameter of the oil pan bearing Inner diameter of the small end Oil clearance of the big end Side clearance of the big end 29 94 mm 1 1787 in 24 98 mm 0 9835 in Clearance between the cam shaft and bearing 0 02 0 05 mm 0 0008 0 002 in 16 010 mm 0 6303 in 0 053 0 079 mm 0 0021 0 0031 in 0 20 0 40 mm 0 008 0 016 in Clearance between the crank shaft and bearing 0 015 0 040 mm 0 0006 0 0016 in 4

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