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Инструкция по эксплуатации Страница: 14

BMW R100R [14/168] Testing compression pres sure

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Compression pressure on both cylinders evenly too low I Parts of both cylinders are evenly worn Following completion of test e Screw in spark plug on both cylinders Fit on spark plug connector Connect three pin plug Insert fuel tank into rear lock Close locking bar lnsertseatintolocksatfrontandrear lock if necessary f I I I lightening torque Sparkplugs Unscrew spark plugs 3 on both cylin ders Hold throttle control in full throttle position Press compression pressure tester 2 firmly into spark plug hole Crank engine with starter until indicated pressure no longer rises Repeat operations on other cylinder Pressure difference between both cylin ders must not exceed 1 bar NOTE Perform test only when 1 valves correctly set 2 engine at normal operating tempera ture to ensure seal between piston piston rings and cylinder liner and 3 battery charged CAUTION It is essential to interrupt ignition otherwise ignition coil could be destroyed Remove seat Slacken locking clamp of fuel tank moun ting rear Lift off fuel tank rear and prop up Interrupt ignition by disconnecting three pin plug 1 2 10 Compression pressures good normal poor 9 bar 7 5 9bar 7 5 bar more than less than Compression pressure too low Pourafewdropsofengineoii inder Repeat test procedure If compression pressure rises piston ring is probably worn intothecyl Compression pressure constant Valves and or piston rings worn Electrodes and interior of coated with black film of oil spark plug Effects when driving Poor cold starting behaviour Misfiring Possible sources of fault Oil in combustion chamber Wear or damage to piston rings cylinder or valve guides Bright overheated 25 Nm 2 3 SPARK PLUGS 2 2 TESTING COMPRESSION PRES SURE Oil fouled The spark plug can provide information regarding the ignition and carburettor set tings as well as regarding the state and operating conditions of the engine The following procedure should be adopted for examining the spark plug pat tern Warm up engine by running for approx 10 km in medium rpm range Switch off engine before motor cycle has come to a stop Avoid the engine running for a lengthy pe riod at idle throttle before switching off Unscrew spark plugs CONDITION OF SPARK PLUGS Normal Insulator base is light grey to fawn brown The thermal state of the spark plug is correct Engine state combustion and combustion temperature are in proper order Carburettor and ignition are correctly set Electrode and base of insulator snow white despite lengthy operation If severely over heated centre and ground electrodes will show signs of melting as a result of auto igni tion Effects when driving Loss of power Misfiring Total failure engine damage Possible sources of fault Incorrect setting type of carburettor mix ture too lean Incorrect ignition setting ignition exces sively advanced Deposits in combustion chamber which may cause auto ignition Spark plug too hot incorrect heat rat ing Worn Electrode Effects when driving Poor cold starting behaviour Misfiring principally when accellerating Possible sources of fault Spark plugs not changed at correct inter val Carbon fouled Spark plug covered with soft dry deposits of soot Effects when driving Poor cold starting behaviour Misfiring creep currents Dark exhaust Possible sources of fault Incorrect setting type of carburettor too rich mixture Air filter fouled Spark plug too cold incorrect heat rat ing Frequent short trips Choke does not open fully 2 11

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