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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Crankshaft and crankcase, Assembly, 502 50

Models: 343R, 345RX, 343F, 345FX, 345FXT

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Crankshaft and crankcase

7

Check that the there is no play in the fill-out plates around the crank disks (applies to models FX/FXT, RX).

Assembly

Mount the bearings in the crankcase halves.

First fit the crankshaft in the clutch-side crankcase half.

502 50 30-19

Fit a new gasket to the clutch-side crankcase half.

Pull the other crankcase half into position and tighten the 4 crankcase bolts.

502 50 30-19

Check that the there is no play in the fill-out plates around the crank disks (applies to models FX/FXT, RX).

Assembly

Heat the crankcase halves to approx. 150°C using a hot air gun and position the bearings.

Make sure they go right down into the bearing seats.

Lubricate the big-end bearing with a few drops of engine oil and position the crankshaft in the clutch-side crankcase half.

Pull the crankshaft into place with tool no. 502 50 30-19.

Make sure that the connecting rod is not squeezed against the crankcase!

Fit a new gasket to the clutch-side crankcase half.

Place the other crankcase half over the crankshaft and place the 4 crankcase bolts so that they guide the gasket.

Pull the crankcase half into place with tool no. 502 50 30-19.

Tighten the crankcase bolts.

Check that the crankshaft can rotate easily. If not, hit the axle spindles sharply a few times with a rubber hammer so that the tension in the crankshaft disappears.

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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Crankshaft and crankcase, Assembly, 502 50

Contents

Workshop manual English343R 345RX 343F 345FX 345FXT Model 343R, 345RX, 343F, 345FX, 345FXT Contents General recommendations ___________________1.Starter __________________________________ 2.Electrical system _________________________General recommendations RememberSpecial tools Fire riskContents 1 StarterDismantling 1StarterDismantling Assembly AssemblyStarter Replacing the drive dogs Replacing the drive dogs1Starter Electrical system ContentsAssembly _________________________________ Checking the ignition spark ____________________Electrical system Checking the ignition spark502 71 Checking the ignition sparkElectrical system Replacing the spark plug cover502 50 Electrical system502 54 Electrical systemDismantling DismantlingDrive dogs Heated handlesDo not pry off the heating element before the locking catch has beenWiring diagram Electrical systemElectrical system Fuel system ContentsAssembly _________________________________ Carburettor settings _________________________Air filter Fuel systemAir filter Tank venting Fuel filterMassage the oil into the air filter Fuel systemFuel pump CarburettorDismantling Fuel systemThe carburettor’s design The metering unitThe blending unit Fuel systemThe pump unit Dismantling the carburettorFuel system The pump unitFuel system In the event of leakage – remove the needle valveNote how the jets are positionedFor example, the H-needleis a little shorter than the L-needleAssembling the carburettor Use Loctite on the valve screwsFuel system Assembling the carburettorare not bent or pinched when the The H-needleis a little shorterthan the L-needle Check carefully that the fuel hosesCarburettor settings Basic settingFine adjustment Functionsetting Correctly adjusted carburettorThe recommended max. speed must not be exceeded Idling speed T-screwCarburettor adjustment 345RX/FX adjustment 345RX/FXAdjusting the L-needle Adjusting the HCheck for wear on pins A and B Fuel systemDisassemble the throttle control A, the lock to prevent accidental throttle operation B, the start throttle lock C and the throttle stop D in order to check if replacement is necessary Fuel systemPage 4 Centrifugal clutch ContentsAssembly _________________________________ Dismantling ________________________________Centrifugal clutch 502 21Dismantling DismantlingCentrifugal clutch 502 54Clutch drum 502 11Assembly AssemblyChange the bearings in the clutch housing if necessary Centrifugal clutchPage 5 Angle gear ContentsAssembly _________________________________ Dismantling ________________________________Angle gear Let the small circlip around the axle remainDismantling DismantlingAngle gear 503 97Assembly Shaft 503 80Angle gear Shaft6 Cylinder and piston ContentsCleaning, inspection _________________________ Assembly _________________________________Cylinder and piston DismantlingTurn the valve the right way when fitting Decompression valveCylinder and piston Decompression valveCleaning, inspection manifold is fitted using aInlet manifold Exercise caution if the inletAnalysis and actions Insufficient lubricationCause ActionPiston scoring caused by heavy carbon deposits Cylinder and pistonCause ActionPiston damage caused by a too high engine speed Piston ring breakagePiston ring guide pin Damage caused byForeign objects Cylinder and pistonCause ActionService tips DefectBe careful with the lower edge of the piston ring groove. If this is damaged, or if carbon depositsWear tolerances Cylinder borePiston ring gap Piston ring groove7 Crankshaft and crankcase ContentsAssembly _________________________________ Leakage testing the crankcase _________________Dismantling Crankshaft and crankcaseDismantling Crankshaft and crankcase 502 52Inspecting the crankshaftCrankshaft and crankcase Inspecting theAssembly AssemblyCrankshaft and crankcase 502 50Leakage testing the crankcasePress down the sealing plates as far as possible between the boltsCrankshaft and crankcase Husqvarna E-Tech503 55 Page Tools ContentsStarter __________________________________ Electrical system __________________________List of tools 505 38Starter ElectricalList of tools gearCrankshaft Workshop114 01 2003W24