Оценок - 2, средний балл: 3
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Фрагмент инструкции
TROUBLESHOOTING ROCKER ARM CLEARANCE The rocker arm clearance may need adjustment if your unit suffers a loss of performance power or has trouble starting. Adjusting the rocker arm clearance requires disassembly of the engine. If you feel unsure or unqualified to perform this, take the unit to a Sears or other qualified service dealer. NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 10 hours of operation and then every 25 hours of operation thereafter. • The engine must be cold when checking or adjustingthe valve clearance. • This task should be performed inside, in a clean, dust free area. To adjust the rocker arm clearance: 1. Remove the two (2) screws on top of the engine cover with a Flat-head or T-25 Torx screwdriver (Fig. 25). Top View Of The Engine Remove ScrewsEngine Cover Fig. 25 Muffler 2. Remove the screw behind the engine cover (Fig. 26). Fig. 26 Screw 3. Disconnect the spark plug wire. 4. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning it counterclockwise with a 5/8” socket. 5. Remove the engine cover. NOTE: To ease engine cover removal, pull the starter rope out a little to give some slack. 6. Clean dirt from around the rocker arm cover. Remove the screw holding the rocker arm cover with a large flat blade screwdriver or Torx T-25 bit (Fig. 27). Remove the rocker arm cover and gasket. Rocker Arm Cover Spark Plug Hole Fig. 27 Gasket 7. Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that: • The piston is at the top of its travel while looking in the spark plug hole (Fig. 27) • Both rocker arms move freely, and both valves are closed If these statements are not true, repeat this step. 8. Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance Adjusting Nut Rocker Arm 0.003–0.006 in. (0.076–0.152 mm) TROUBLESHOOTING Fig. 29 Feeler Gauge Valve Stem between the valve stem and rocker arm (Fig. 29). Measure both the intake and exhaust valves. The recommended clearance for both intake and exhaust is 0.003 – 0.006 in. (0.076 – 0.152 mm). Use a standard automotive 0.005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. See Figure 28 and 29. Adjusting Nuts Feeler Gauge Rocker Arms Fig. 28 INTAKE EXHAUST 9. If the clearance is not within specification: a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 29). • To increase clearance, turn the adjusting nut counterclockwise. • To decrease clearance, turn the adjusting nut clockwise. b. Recheck both clearances, and adjust as necessary. 10. Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m). 11. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws. 12. Check the spark plug and reinstall. See Replacing the Spark Plug. 13. Replace the spark plug wire. SPECIFICATIONS ENGINE* Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 4-Cycle Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 cu. in. (26.2 cc) Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,000-3,600 rpm Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,200-8,800 rpm Clutch Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Centrifugal Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electronic On/Off Stop Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rocker Switch Valve clearance (intake and exhaust) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.003–0.006 in. (0.076–0.0152 mm) Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 inch (0.655 mm) Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SAE 30 Oil Crankcase Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 oz (100 ml) Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....