Tohatsu MFS 4 [31/81] Chapter 4 power unit
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Tohatsu MFS 4 [31/81] Chapter 4 power unit

Tohatsu MFS 4 [31/81] Chapter 4 power unit

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CHAPTER 4 POWER UNIT 1 General Notes on Service When servicing the engine pay heed to the following matters that are must follow instructions and general notes on servicing the outboard motor in whole 1 When servicing the outboard motor be sure to securely fix it on a proper workstand 2 Be careful not to scratch or damage the mating surfaces of the cylinder cylinder head oil pan and coated surfaces etc during servicing 3 Don t reuse packings gaskets O rings split pins that are once removed for servicing and replace them with new ones when reassembling Deformed snap rings must be also replaced with new ones 4 When replacing parts be sure to use genuine parts Regarding lubricants use genuine or specified oil and grease without fail 5 For services that require to use a special tool s use the specified tool s following the instructions to carry out the services properly 6 On disassembling and removing parts pay careful attention to mating point marks of respective parts If no marks on it make simple marks at those mating points for convenience for reassembling 7 To avoid losing small parts temporarily restore bolts nuts washers and other small parts to their respective original positions as far as circumstances permit 8 When parts are removed for disassembling dust off them and wash them with wash liquid or white gasoline and then check to see if they are worn or damaged 9 Through reassembling pay heed to every detail such as mating preciseness in centering air tightness lubrication grease up cleanliness of oil and fuel paths packing wiring piping etc 1 When fastening a part for which many bolts and nuts are used cylinder head oil pan etc carefully tighten the bolts and nuts in order from inner ones to outer ones diagonally or circularly to avoid unevenly tightening When removing bolts and nuts from such a part carefully loosen and remove them in the reverse manner 2 When inserting an oil seal be careful neither to make mistake in setting the wrong side up nor to scratch the mating surface lip to the shaft Apply grease onto the lips 3 When applying liquid sealant take care of its quantity and thickness If sealant is too much applied the excess may not only stick out and flow into the case but also cause bad influence When using an adhesive carefully follow the instructions 4 If a bolt or nut is hard to loosen and remove because of rust spray liquid screw loosener to it and try to loosen and remove It five or more minutes after 5 For details of service standards tightening torques parts that are specified to apply sealant glue grease etc refer to the service data table 6 Bolts nuts and washers are indicated by the symbols below H820 Hexagon headed bolt N8 Normal hexagon nut L8 Hexagon lock nut W6 Plain washer SW6 Spring washer Screw 620 Pan headed screw Diameter 8 mm Diameter 8 mm Diameter 8 mm Diameter 6 mm Diameter 6 mm Diameter 6 mm Lengh 20 mm Lengh 20 mm 10 Work carefully during maintenance and repair to avoid injuries and accidents 28

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