PART NO G4113 HANDBOOK
Contents
1. i Ifthis timing light fails to operate correctly switch off the engine and check that the leads are making good connection ii if the engine will not start and there is no timing flash check that there is no HT leakage to earth and there is a good spark at the number one plug Lay a plug on the engine with number one HT lead connected to it while an assistant operates the starter iii If the engine is running and there is no flash check the sensitivity adjustment is fully 9 Gunson Inductive Xenon Timing Light anticlockwise and that spark energy is not being reduced by an ignition system fault 8 GUARANTEE This warranty is in addition to the statutory rights of the purchaser The Tool Connection has made every effort to ensure that this product is of the high est quality and value to the customer However The Tool Connection cannot accept any responsibility for consequential damage howsoever caused arising from the use of this product All technical enquiries regarding this product should be made to The Tool Connection on 01926 818181 Please note that The Tool Connection cannot provide technical information or advice or service data on particular motor cars If this product should require service or repair it should be returned to The Tool Connection Kineton Road Industrial Estate Southam Warwickshire CV47 ODR Please include details of the fault and if possible a daytime telephone number When sending goods2. A greater increase in advance should be seen iii To check an ECU advance function observe the pulley mark first at slow and then increased speed Advance movement opposite the direction of rotation will occur in all cases except if the ECU is in vehicle limp home mode due to a serious malfunction of ECU or sensor E DETAILED TESTING OF ADVANCE MECHANISMS Car manufacturers often specify the ignition timing advance at various engine RPM in order to fully check the correct operation of automatic advance mechanisms and also to check electronic Engine Management Systems i Fit the enclosed timing disc to the flywheel pulley or mark the pulley see the instructions on the timing disc ii Carefully follow the car manufacturer s instructions regarding the connection or disconnection of the vacuum advance pipe and any other instructions iii Set the engine RPM at the various speeds as required and measure the degrees of ignition timing at each engine speed using the timing disc Compare the results with those specified in the workshop manual F FURTHER NOTES i The use of quick drying white paint such as typist s correction fluid may be found beneficial in highlighting the timing marks ii In order to achieve a steady speed the engine should be at normal operating temperature iii The inductive HT connector contains a delicate ferrite material Take care when handling and do not allow it to snap shut G TROUBLE SHOOTING
3. advised by the makers of the electronic equipment Il Remember that Low Tension Voltage present on the LT terminal of the ignition coil and at the contact breakers can also give a slight electrical shock 12 Store this timing light in a dry place and do not use it if allowed to become wet 13 Take care not to inhale exhaust gas Never run the engine inside a garage or in a confined space When running the engine always ensure there is adequate circulation of fresh air Ensure that there are no leaks in the exhaust system near where you are working Keep children and pets away from the car while work is being carried out 5 GENERAL WARNING This equipment has been designed to operate in the harsh environment close to spark ignition engines but the user should be aware of the following I Spark ignition engines and related electronics can emit high levels of interference which could effect test and maintenance equipment together with other electrical items such as radio or television receivers computers etc 2 Any interference emitted from the engine area could be increased by a Opening the engine cover b Making an electrical connection to the vehicle wiring loom or the vehicle battery c Any faulty components particularly if those associated with the ignition system 3 If this equipment has any display which behaves in an erratic nature the user is advised to refer to the advice given in the detailed instructions to minimise
4. car battery red to positive The circuit is continuously powered when connected to the battery as this model does not have an on off trigger switch Gunson Inductive Xenon Timing Light B SETTING ENGINE SPEED i Start the engine and check the engine speed to ensure it is within the manufacturers recommended settings If no idle speed data is available check that the setting is reasonable or set to a typical idle i e 850 RPM for a 4 cylinder car engine Advance rarely commences below 1000 RPM therefore ignition timing accuracy will be unaffected by slight variations whereas for CO emissions setting the correct speed is important ii Adjust the engine speed as required using the idle speed screw i e throttle stop screw or idle by pass screw if the throttle stop is locked Check the correct speed is achieved C SETTING INITIAL TIMING i Direct the timing light towards the timing marks The movement of marks on the moving part i e the fan belt pulley or engine flywheel will now appear to be frozen Observe the alignment of the stationary and moving marks ii Rotate the distributor body to advance or retard the ignition timing as required until the timing marks are aligned correctly Keep hands away from the area where HT leads are attached as the insulation may be imperfect and extremely high voltages are present iii Check that engine speed is still as required This can vary if ignition timing has been corrected adjust a
5. that the spark occurs at a point several degrees before Top Dead Centre when the full power of the explosion is obtained For example 4 degrees BTDC or Retarded Engine timing is changed by adjustment of the ignition distributer In order to allow setting and adjustment of the engine timing special Timing Marks are provided on each engine by the manufacturer during assembly In most cases these marks appear on the engine vibration damper or fan pulley at the lower front of the engine On some early engines these marks were shown on the flywheel at the rear of the engine ALWAYS CONSULT YOUR VEHICLES SERVICE MANUAL FOR MANUFACTURERS TIMING RECOMMENDATIONS PLEASE READ THE FOLLOWING SAFETY PRECAUTIONS BEFORE USING THIS PRODUCT 4 PRECAUTIONS Using this timing light necessarily involves working under the bonnet while the engine is running This is a potentially hazardous situation and the user should take every pre caution to avoid any possibility of injury The following guidance should always be fol lowed I Never wear loose clothing particularly ties long sleeves etc that can catch in moving engine parts and always tie up or cover long hair 2 Ensure that the car is on firm level ground and is out of gear and the handbrake firmly applied at all times 3 If for any reason the car is jacked up or the wheels removed always ensure that the car is well supported and never rely on a car jack alone always use ramps or axle sta
6. the pos sibility of interference In cases of difficulty the user is advised to check for the following a A faulty vehicle battery or poor connections to it b Poor ground connection to engine or other electrical equipment c Faulty ignition components particularly rotor arms ignition coils or HT leads with an internal break or with a resistance outside vehicle manufacturers limits The user is therefore advised due to the potential emitting of interference that vehicle maintenance and testing should be undertaken with due care and not in an area close to sensitive electronic equipment Gunson Inductive Xenon Timing Light 6 GENERAL NOTES With the timing light power leads connected and inductive pickup clipped externally to a spark plug a flash of light is produced every time that particular spark plug fires These flashes of light are directed at the ignition timing marks which are located either on the fan belt pulley or the engine flywheel and effectively freeze the motion of the rotating parts This enables the ignition timing of the engine to be measured and checked against the car s technical service data The ignition timing can then be adjusted as required Adjusting the timing is a simple operation as described below or as given in the car s workshop manual or handbook Some vehicles may be fitted with an Electronic Control Unit ECU which not only controls the advance curve at various engine RPM but also fixes the b
7. Gunson INDUCTIVE XENON TIMING LIGHT PART NO G4113 HANDBOOK Gunson Inductive Xenon Timing Light Inductive Xenon Timing Light CONTENTS Page 1 DESCRIPTION 4 2 PRINCIPLE OF OPERATION 4 3 CONVERTING TO UNLEADED PETROL 4 4 PRECAUTIONS 5 5 GENERAL WARNING 6 6 GENERAL NOTES 7 7 INSTRUCTIONS 7 A Preparation for setting initial timing B Setting engine speed C Setting initial timing D Simple testing of advance mechanisms E Detailed testing of advanced mechanisms F Further notes G Trouble shooting 8 GUARANTEE 10 Gunson Inductive Xenon Timing Light I DESCRIPTION Suitable for any petrol engined vehicle with 12v ignition system including electronic types where applicable some ignition systems with ECU are not externally adjustable indicates ignition timing and allows adjustment to manufacturers specification inductive pickup clips directly on the ignition H T lead powered by vehicle s own 12V battery The special Xenon bulb will provide the ultrabright flash needed to see engine timing marks under normal daylight or bright workshop conditions 2 PRINCIPLE OF OPERATION In order for an engine to function four elements are necessary air fuel spark and compression to ignite the air fuel mixture and create an explosion The precise instant of that explosion must be such that the maximum power is delivered to the engine s piston This is timing It is essential to the correct operation of t
8. asic setting On these systems inspection of the timing and ignition advance may be possible and set ting options may be available for alternative fuel octane ratings but conventional adjustment may not be possible 7 INSTRUCTIONS FOR USE A PREPARATION FOR SETTING INITIAL TIMING i Before commencing the job check the details of the required timing data in the car s workshop manual ii Initial timing is generally specified at idle rpm which will be given It is extremely unusual for vacuum advance to be in operation at idle speed so this pipe may remain connected for setting initial timing unless clearly stated otherwise the vacuum advance pipe is a small pipe that leads from the carburettor to the distributor With the engine switched off make any preliminary adjustments as required in the workshop manual and slacken the distributor bolt sufficiently to enable the distributor to be turned by hand Do not loosen it completely as some resistance to turning is required in order to maintain a set position iii Slide open the inductive pickup clip and attach to the spark plug lead for number one cylinder Observe the marking which indicates the direction of attachment i e in which direction the spark plug is located The inductive clip should always be handled with care as the materials from which the sensor is constructed include glass Also connect the red and black clips of the Timing Light to the positive and negative terminals of the
9. for service or repair please give full details of faults requiring attention 10 Gunson Inductive Xenon Timing Light Do you need a thingamajig or a whatsit for a doo dah LASER s New Tools Forum e Helps you find the tools you need e Helps us supply the tools you need e Helps others get more information New Tool Forum lasertools co uk If you do tools come and talk tools Part of the connection Distributed by The Tool Connection Ltd Kineton Road T 44 0 1926 815000 TA TOOL Southam F 44 0 1926 815888 e CONNECTION Warwickshire info toolconnection co uk CV47 ODR www toolconnection co uk
10. he car that the ignition timing is correct as recommended by the car manufacturer The requirement for accurate engine speed setting is particularly important if timing is carried out at above idle speed when the advance mechanisms are in operation Incorrect ignition timing is a very common cause of many engine symptoms POOR FUEL ECONOMY LOW ENGINE POWER DIFFICULT ENGINE STARTING ENGINE OVERHEATING ignition too retarded BACKFIRES ignition too advanced ENGINE PINKING ignition too advanced ENGINE RUNNING ON 3 CONVERTING TO UNLEADED PETROL Converting an early model of engine to run on UNLEADED PETROL entails RETARDING the ignition timing to a new setting recommended by the vehicle manufacturer Care must be taken in making this conversion as not all cars can be converted without the danger of damage to the engine parts particularly exhaust valves and their seats If in doubt about the ignition setting for your car or whether your car can be converted to un leaded petrol consult a manual for the model concerned or a manufacturers agent There are numerous variations with engine type and year of manufacture 4 Gunson Inductive Xenon Timing Light Manufacturers recommended timing is given in degrees Before Top Dead Centre BTDC or ADVANCED After Top Dead Centre ATDC or RETARDED In order to completely burn the air fuel mixture in the vehicle s engine cylinders most timing is set so
11. nd recheck timing marks as required iv Carefully clamp the distributor and re check the timing to confirm that it has not been disturbed If tightening the clamp entails using tools near rotating parts stop the engine first then restart to check v Switch off the engine disconnect the timing light or continue as below if required D SIMPLE TESTING OF ADVANCE MECHANISMS Engines normally have vacuum and centrifugal mechanisms to automatically increase ignition advance with manifold vacuum and engine rpm Alternatively this process is controlled by an ECU By speeding up the engine and observing the timing marks it is possible to carry out simple tests to confirm that the vacuum and centrifugal advance are working or the ECU is performing an ignition advance function depending on manifold pressure from MAP sensor and RPM signals If no mark exists a white paint spot should be applied to the crankshaft pulley in a position which is visible with the engine running Accurate positioning ref to TDC is not required to visually heck advance with increasing RPM i To check the centrifugal advance mechanism disconnect the vacuum advance pipe and increase the engine speed The timing marks should be seen to move to a more 8 Gunson Inductive Xenon Timing Light advanced setting i e move in the opposite direction to pulley rotation ii To check the vacuum advance mechanism reconnect the vacuum advance pipe and repeat the above procedure
12. nds Be wary of axle stands and jacks sinking into soft ground and remember that asphalt surfaces may appear firm but may give way under the concentrated load of a jack or axle stand 4 Do as much of the work as possible without the engine running 5 Always route cables well away from hot or moving parts particularly the exhaust pipe and cooling fan and check that cables are in a safe position before starting the engine 6 Always guard against getting the timing light or fingers too close to moving hot or electrical parts Be especially wary of the fan fan belt fan belt pulley exhaust manifold exhaust pipe and HT parts of the ignition system Remember that thermostatically controlled fans may suddenly start with no warning 7 Take care to avoid placing metal tools where they may cause an electrical short 5 Gunson Inductive Xenon Timing Light such as near the car battery 8 Take care not to place tools etc where they may be dislodged by engine vibration 9 Treat High Tension components with respect remembering that electrical shocks can cause involuntary movement which may result in secondary injury Remember that sparks can jump quite a distance Also remember that severe unexpected HT shocks can be received from old worn damaged or wet components e g HT leads coil and distributor 10 Keep all sensitive electronic equipment away from HT voltages and do not make any electrical connection to HT voltages except as expressly
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