Makita EK7650H Technical Information

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[4] DISASSEMBLY/ASSEMBLY[4]-8. Engine (cont.)R epairP 15/ 19DISASSEMBLINGFig. 54Note: Cam gear assembly functions as automatic decompression valve system.Valve is slightly open to release the compressed air in Engine at the starting time, before moving fly weightby centrifugal effects. It means the insufficient setting of Cam gear assembly will cause engine stall/ extremereaction force at engine running due to too much load by the compressed air.(11) Remove Pin 5 that sets Rocker arm assembly in place on Cylinder head complete. (Fig. 54)Use 1R308 to push out Pin 5.The distinction of Rocker arm assembly and Push rods (for use of the exhaust system/ intake system) enables youshortens the repair process (Gap adjustment between Rocker arms and Retainers is even difficult, however, you canadjust it by using 1R366. Refer to Fig. 68.Important: Disassemble the parts in the room on Cylinder head complete before removing it andclean the clogged portions in the following steps. You may repair successfully withoutdoing the step (5) and later in the next page.(1) Remove Rocker cover complete, then push out Pin 5 on hinge for Rocker arms with 1R308 and remove Rocker arms.(Refer to Figs. 50 and 54)(2) Remove Spark plug. Turn Flywheel until Piston comes to the upper dead point by looking through Spark plug holeon Cylinder head complete.Note: Align the rib as a mark on Flywheel with the rib on Cylinder block as drawn in Fig. 55.(3) Insert a bent Lead wire #16 into Combustion chamber through Spark plug hole so that Valves do not fall intoCombustion chamber. (Fig. 56)(4) While compressing Compression spring 11 by pushing Retainer with 1R003 attached with 1R389, remove Cotter bya thin bit magnetized by 1R288.Routes in Cylinder head complete, the upper surface on Valves and the room on Cylinder head complete can be cleanthrough removal of four Cotters, two Retainers, and two Compression springs 11.Fig. 55 Fig. 57Fig. 561R3891R003Rocker arm assemblyExhaustpush-rodPin 5Cylinder headcompleteIntakepush-rodIntakesystemExhaustsystemRib on FlywheelRib on Cylinder block Retainer (2 pcs.)Cotter (4 pcs.)[viewed from the upper side of the room]Compressionspring 11 (2 pcs.)Intake valve Exhaust valveCylinder head completeNote: Intake system of Rockerarm has to be close tothe hole of Cylinder headcomplete.the hole of Cylinder head completeUse Cotter removalattachment to pushRetainer.Note: Intake valve has tobe close to this holeof Cylinder headcomplete.