TAILIEUCHUNG - Motorcycle Mechanics 2009 Part 9

Tham khảo tài liệu 'motorcycle mechanics 2009 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Unit 13 MultiCylinder Lower Ends Inner Seals may Leak Fig. 13-13 Seal positions in a 2-stroke 3-cylinder lower end shiny metal flakes you find in the oil. In a brand new bike you might expect a slight bit of metal flake to come out with the oil due to normal break-in wear. However if excessive engine lower-end noises are associated with drastic increases in the metal flake content of the oil prepare for the worst. In all likelihood you have a lower-end job on your hands. Service Questions. Before removing the engine for a lower-end job ask yourself again Am I sure absolutely and positively beyond any shadow of a doubt that the problem is in the lower end Have I exhausted all other possibilities Have I performed all the tests and diagnostic procedures that are possible with the engine still in the frame If the answers to these questions are yes then remove the engine. Have your service manual handy because the information given here is not meant to replace the shop manual for a particular model but rather to help you understand the theory behind its directions. Removing an engine can be a challenge. Some engines can be removed only from one side of the bike. That is to say that some frames are designed with special bevels for clearance to remove the engine on only one side. Be Organized Remember again that thousands of basket cases begin as sloppy disassemblyjobs. One woodruff key that was lost or a misplaced spacer that was left out has disabled many a machine and soured many a young mechanic. Before turning out that first bolt find enough small boxes bags muffin tins or whatever storage aids you need to help organize the fasteners and small parts. Loosen the bolts nuts and screws incrementally by the pattern recommended in your manual. Store each part or fastener removed in the same sequence as you removed it so that the parts will be in proper order when you reassemble the engine. Be sure to keep things like the connecting rods and caps in sets with their pistons

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