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Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Wear tolerances, Cylinder bore, Piston ring gap

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

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Page 51

Image 51

Cylinder and piston

Wear tolerances

Cylinder bore

Piston ring gap

Piston ring groove

Piston ring play

When the surface coating is worn and aluminium appears.

Max. 1.0 mm with the piston ring inserted in the lower part of the cylinder.

Max. 1.6 mm. Clean the groove before checking the measure- ment.

Max. 0.15 mm. Clean the groove before checking the measure- ment.

Page 51

Image 51

Husqvarna 343R, 345RX, 343F, 345FX, 345FXT manual Wear tolerances, Cylinder bore, Piston ring gap, Piston ring groove

Contents

English 343R 345RX 343F 345FX 345FXTWorkshop manual 2.Electrical system _________________________ Model 343R, 345RX, 343F, 345FX, 345FXT ContentsGeneral recommendations ___________________ 1.Starter __________________________________Fire risk General recommendationsRemember Special tools1 Starter Contents1Starter DismantlingDismantling Assembly StarterAssembly Replacing the drive dogs 1StarterReplacing the drive dogs Checking the ignition spark ____________________ Electrical systemContents Assembly _________________________________Checking the ignition spark Electrical systemChecking the ignition spark 502 71Electrical system Electrical system Replacing the sparkplug cover 502 50Dismantling 502 54Electrical system Dismantlingbefore the locking catch has been Drive dogsHeated handles Do not pry off the heating elementElectrical system Wiring diagramElectrical system Carburettor settings _________________________ Fuel systemContents Assembly _________________________________Fuel system Air filterAir filter Fuel system Tank ventingFuel filter Massage the oil into the air filterFuel system Fuel pumpCarburettor DismantlingFuel system The carburettor’s designThe metering unit The blending unitThe pump unit The pump unitDismantling the carburettor Fuel systemIn the event of leakage – remove the needle valve Fuel systemlittle shorter than the L-needle Note how the jets arepositioned For example, the H-needleis aAssembling the carburettor Assembling the carburettorUse Loctite on the valve screws Fuel systemCheck carefully that the fuel hoses are not bent or pinched when theThe H-needleis a little shorter than the L-needleFunction Carburettor settingsBasic setting Fine adjustmentIdling speed T-screw settingCorrectly adjusted carburettor The recommended max. speed must not be exceededAdjusting the H Carburettor adjustment 345RX/FXadjustment 345RX/FX Adjusting the L-needleFuel system Check for wear on pins A and BFuel system Disassemble 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 necessaryPage Dismantling ________________________________ 4 Centrifugal clutchContents Assembly _________________________________Dismantling Centrifugal clutch502 21 Dismantling502 54 Centrifugal clutchAssembly Clutch drum502 11 AssemblyCentrifugal clutch Change the bearings in the clutch housing if necessaryPage Dismantling ________________________________ 5 Angle gearContents Assembly _________________________________Dismantling Angle gearLet the small circlip around the axle remain Dismantling503 97 AssemblyAngle gear Shaft Shaft503 80 Angle gearAssembly _________________________________ 6 Cylinder and pistonContents Cleaning, inspection _________________________Dismantling Cylinder and pistonDecompression valve Turn the valve the right way when fittingDecompression valve Cylinder and pistonExercise caution if the inlet Cleaning, inspectionmanifold is fitted using a Inlet manifoldAction Analysis and actionsInsufficient lubrication CauseAction Piston scoring caused by heavy carbon depositsCylinder and piston CauseDamage caused by Piston damage caused by a too high engine speedPiston ring breakage Piston ring guide pinAction Foreign objectsCylinder and piston Causegroove. If this is damaged, or if carbon deposits Service tipsDefect Be careful with the lower edge of the piston ringPiston ring groove Wear tolerancesCylinder bore Piston ring gapLeakage testing the crankcase _________________ 7 Crankshaft and crankcaseContents Assembly _________________________________Crankshaft and crankcase DismantlingDismantling 502 52 Crankshaft and crankcaseInspecting the Inspecting thecrankshaft Crankshaft and crankcase502 50 AssemblyAssembly Crankshaft and crankcasefar as possible between the bolts Leakage testing thecrankcase Press down the sealing plates asHusqvarna E-Tech 503 55Crankshaft and crankcase Page Electrical system __________________________ ToolsContents Starter __________________________________Electrical List of tools505 38 StarterWorkshop List of toolsgear Crankshaft2003W24 114 01