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

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Cylinder and piston

6.

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

Contents

English Model 343R, 345RX, 343F, 345FX, 345FXT Contents Workshop Manual Brushcutter, Trimmer General recommendations Contents Starter 1Starter Dismantling Assembly Starter Replacing the drive dogs Electrical system Electrical system Checking the ignition spark502 71 Tip Replacing the spark Plug cover 502 50 502 54 Drive dogs Heated handles Wiring diagram Electrical system Fuel system Fuel system Air filter Tank venting Fuel filter Fuel pump CarburettorDismantling Carburettor’s design Metering unitBlending unit Pump unit Dismantling the carburettor Fuel 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 when Carburettor 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-screw Throttle Carburettor adjustment 345RX/FXAdjusting the L-needle Adjusting the H-needle Rotating Check for wear on pins a and B Tip Page Centrifugal clutch Centrifugal clutch 502 21 Centrifugal clutch Do not lose the sleeve bearings found in the clutch shoes Clutch drum 502 11 Change the bearings in the clutch housing if necessary Page Angle gear Angle gear Let the small circlip around the axle remain 503 97 Input axle with pinion must be dismantled first Shaft 503 80 Cylinder 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 manifold Analysis and actions Insufficient lubricationCause Action Piston scoring caused by heavy carbon deposits Piston damage caused by a too high engine speed Piston ring breakage Foreign objects Cause Service tips Defect Action Wear tolerances Crankshaft and crankcase Crankshaft and crankcase Crankshaft and crankcase 502 52 Inspecting Crankshaft Assembly Far as possible between the bolts Leakage testing CrankcasePress down the sealing plates as To ensure a proper seal Husqvarna E-Tech 503 55