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Руководство по эксплуатации Страница: 20

BMW K75 [20/236] Clutch operating problems

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20 Fault diagnosis spark plug cap due to old age or damage can cause shorting when the engine is driven hard This condition may be less noticeable or not noticeable at all at lower engine speeds Engine oil of incorrect viscosity or poor quality Always use the recommended viscosity and type of oil Oil filter and filter by pass valve blocked Renew filter 17 Fuel air mixture incorrect 23 Miscellaneous causes All items as for Section 13 with the exception of item 2 Radiator fins clogged or other cooling system fault Refer to Chapter 4 18 Compression low Clutch operating problems See Section 10 24 Clutch slip Knocking or pinking 19 General causes Carbon build up in combustion chamber After high mileages have been covered a large accumulation of carbon may occur This may glow red hot and cause premature ignition of the fuel air mixture in advance of normal firing by the spark plug Cylinder head removal will be required to allow inspection and cleaning Fuel incorrect A low grade fuel or one of poor quality may result in compression induced detonation of the fuel resulting in knocking and pinking noises Old fuel can cause similar problems A too highly leaded fuel will reduce detonation but will accelerate deposit formation in the combustion chamber and may lead to early pre ignition as described in item 1 Refer to fuel recommendation given in Chapter 5 Spark plug heat range incorrect Uncontrolled pre ignition can result from the use of a spark plug the heat range of which is too hot Weak mixture Overheating of the engine due to a weak mixture can result in pre ignition occurring where it would not occur when engine temperature was within normal limits Overheating 20 Firing incorrect Spark plug fouled defective or maladjusted See Section 8 Spark plug type incorrect Refer to the Specifications and ensure that the correct plug type is fitted Incorrect ignition timing Timing that is far too much advanced or far too much retarded will cause overheating Check the ignition timing is correct No clutch lever play Adjust clutch according to the procedure in Routine Maintenance Clutch plate worn or warped Overhaul clutch assembly replacing plate if necessary See Chapter 2 Pressure or cover plates worn or warped Overhaul clutch assembly replacing plates if necessary See Chapter 2 Clutch spring broken or worn An old or heat damaged from slipping clutch spring should be replaced with a new one Clutch inner cable snagging Caused by a frayed cable or kinked outer cable Replace the cable with a new one Repair of a frayed cable is not advised Clutch release mechanism defective Worn or damaged parts in the clutch release mechanism could include the pushrod thrust bearing or piston Replace parts as necessary Oil leaking on to clutch plate Dismantle clutch Chapter 2 renew clutch plate wash off all traces of oil and trace source of leak If the leak is from the engine refer to Chapter 1 if from the gearbox refer to Chapter 3 25 Clutch drag Clutch lever play excessive Adjust release mechanism See Routine Maintenance Clutch plates warped or damaged This will cause a drag on the clutch causing the machine to creep Overhaul clutch assembly Chapter 2 Clutch release mechanism defective Worn or damaged release mechanism parts can stick and fail to provide leverage Overhaul clutch release mechanism Chapter 2 Engine output shaft not properly located Endfloat will permit movement of the clutch housing which may cause clutch drag See Chapter 1 Loose clutch housing nut See above Tighten as described in Chapter 2 Gear selection problems 21 Fuel air mixture incorrect 26 Gear lever does not return Idle speed mixture strength incorrect Adjust airflow meter bypass Air filter badly fitted or omitted Check that the filter element is in place and that it and the air filter box cover are sealing correctly Any leaks will cause a weak mixture Induction air leaks Check the security of the hose connections and for cracks and splits in the hoses Fuel level too low See Section 6 Fuel tank filler cap air vent obstructed Clear blockage 22 Lubrication inadequate Engine oil too low Not only does the oil serve as a lubricant by preventing friction between moving components but it also acts as a coolant Check the oil level and replenish Engine oil overworked The lubricating properties of oil are lost slowly during use as a result of changes resulting from heat and also contamination Always change the oil at the recommended interval Weak or broken spring Renew the spring Gearchange shaft bent or seized Distortion of the gearchange shaft often occurs if the machine is dropped heavily on the gear lever Provided that damage is not severe straightening of the shaft is permissible 27 Gear selection difficult or impossible Clutch not disengaging fully See Section 25 Gearchange shaft bent This often occurs if the machine is dropped heavily on the gear lever Straightening of the shaft is permissible if the damage is not too great Gearchange arms or pins worn or damaged Wear or breakage of any of these items may cause difficulty in selecting one or more gears Overhaul the selector mechanism

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