Husqvarna 343F, 345FX, 345FXT, 343R, 345RX manual Cylinder and piston, Contents

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Cylinder and piston

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Contents

Dismantling ________________________________ 42

Decompression valve ________________________ 43

Inlet manifold ______________________________ 44

Cleaning, inspection _________________________ 44

Assembly _________________________________ 44

Analysis and actions _________________________ 45

Service tips ________________________________ 49

Wear tolerances ____________________________ 50

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Contents English Model 343R, 345RX, 343F, 345FX, 345FXT Contents Workshop Manual Brushcutter, TrimmerGeneral recommendations Contents Starter1Starter DismantlingAssembly StarterReplacing the drive dogs Electrical system Electrical system Checking the ignition spark502 71 Tip Replacing the spark Plug cover 502 50502 54 Drive dogs Heated handlesWiring diagram Electrical system Fuel system Fuel system Air filterTank venting Fuel filterFuel pump CarburettorDismantling Carburettor’s design Metering unitBlending unit Pump unit Dismantling the carburettorFuel system Positioned For example, the H-needle is aLittle shorter than the L-needle Assembling the carburettor Check carefully that the fuel hoses H-needle is a little shorterThan the L-needle Are not bent or pinched whenCarburettor settings Basic settingFine adjustment Tachometer should always be used to find the optimal Setting Recommended max. speed must not be exceededCorrectly adjusted carburettor Idling speed T-screwThrottle Carburettor adjustment 345RX/FXAdjusting the L-needle Adjusting the H-needle RotatingCheck for wear on pins a and B Tip Page Centrifugal clutch Centrifugal clutch 502 21Centrifugal clutch Do not lose the sleeve bearings found in the clutch shoesClutch drum 502 11Change the bearings in the clutch housing if necessary Page Angle gear Angle gear Let the small circlip around the axle remain503 97 Input axle with pinion must be dismantled firstShaft 503 80Cylinder and piston Cylinder and piston Turn the valve the right way when fitting When the valve is fitted the small hole must face outwardsDecompression valve Cleaning, inspection Inlet manifoldAnalysis and actions Insufficient lubricationCause Action Piston scoring caused by heavy carbon deposits Piston damage caused by a too high engine speed Piston ring breakageForeign objects CauseService tips Defect ActionWear tolerances Crankshaft and crankcase Crankshaft and crankcase Crankshaft and crankcase 502 52Inspecting Crankshaft Assembly Far as possible between the bolts Leakage testing CrankcasePress down the sealing plates as To ensure a proper sealHusqvarna E-Tech 503 55