For spark plug gaping,see the details are as follows :----
Inspection & Gapping
Check the plugs for deposits and wear. If they are not going to be replaced, clean the plugs thoroughly. Remember that any kind of deposit will decrease the efficiency of the plug. Plugs can be cleaned on a spark plug cleaning machine, which can sometimes be found in service stations. These machines are small abrasive blasters and some authorities feel, that since it rounds off the edge of the electrode, it actually raises the voltage requirements to fire the spark plug. While you may be able to do an acceptable job of cleaning with a stiff brush, keep in mind that spark plugs are relatively inexpensive and if there is any question as to their condition, replace them. If the plugs are cleaned, the electrodes must be filed flat. Use an ignition points file, not an emery board or the like, which will leave deposits. The electrodes must be filed perfectly flat with sharp edges. A spark jumps better from a sharp edge
Check spark plug gap before installation. The ground electrode (the L-shaped one connected to the body of the plug) must be parallel to the center electrode. Using a wire feeler gauge, check and adjust the spark plug gap. When using a gauge, the proper size should pass between the electrodes with a slight drag. The next larger size should not be able to pass while the next smaller size should pass freely.
Always check the gap on new plugs as they are not always set correctly at the factory. Do not use a flat feeler gauge when measuring the gap on a used plug, because the reading may be inaccurate. A round-wire type gapping tool is the best way to check the gap. The correct gauge should pass through the electrode gap with a slight drag. If you're in doubt, try one size smaller and one larger. The smaller gauge should go through easily, while the larger one shouldn't go through at all. Wire gapping tools usually have a bending tool attached. Use that to adjust the side electrode until the proper distance is obtained. Absolutely never attempt to bend the center electrode. Also, be careful not to bend the side electrode too far or too often as it may weaken and break off in the engine, likely burying itself in the relatively softer metal of the piston top the first time the engine is started.
Fig. Checking the spark plug gap with a round wire spark plug gauge
Fig. Adjusting the spark plug gap
Fig. If the standard plug is in good condition, the electrode may be filed flat-WARNING: do not file platinum plugs
Check the plugs for deposits and wear. If they are not going to be replaced, clean the plugs thoroughly. Remember that any kind of deposit will decrease the efficiency of the plug. Plugs can be cleaned on a spark plug cleaning machine, which can sometimes be found in service stations. These machines are small abrasive blasters and some authorities feel, that since it rounds off the edge of the electrode, it actually raises the voltage requirements to fire the spark plug. While you may be able to do an acceptable job of cleaning with a stiff brush, keep in mind that spark plugs are relatively inexpensive and if there is any question as to their condition, replace them. If the plugs are cleaned, the electrodes must be filed flat. Use an ignition points file, not an emery board or the like, which will leave deposits. The electrodes must be filed perfectly flat with sharp edges. A spark jumps better from a sharp edge
Check spark plug gap before installation. The ground electrode (the L-shaped one connected to the body of the plug) must be parallel to the center electrode. Using a wire feeler gauge, check and adjust the spark plug gap. When using a gauge, the proper size should pass between the electrodes with a slight drag. The next larger size should not be able to pass while the next smaller size should pass freely.
Always check the gap on new plugs as they are not always set correctly at the factory. Do not use a flat feeler gauge when measuring the gap on a used plug, because the reading may be inaccurate. A round-wire type gapping tool is the best way to check the gap. The correct gauge should pass through the electrode gap with a slight drag. If you're in doubt, try one size smaller and one larger. The smaller gauge should go through easily, while the larger one shouldn't go through at all. Wire gapping tools usually have a bending tool attached. Use that to adjust the side electrode until the proper distance is obtained. Absolutely never attempt to bend the center electrode. Also, be careful not to bend the side electrode too far or too often as it may weaken and break off in the engine, likely burying itself in the relatively softer metal of the piston top the first time the engine is started.
Fig. Checking the spark plug gap with a round wire spark plug gauge
Fig. Adjusting the spark plug gap
Fig. If the standard plug is in good condition, the electrode may be filed flat-WARNING: do not file platinum plugs
This will help.
Thanks.
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