The spark plug dismounting precautions (Dieselpartsworld) 2016-02-28    

The spark plug dismounting precautions
(1) unplug the high-voltage wire joint should be gentle, when you do not shake the spark plug insulator, otherwise it will damage the spark plug sealing performance.
(2) the rear of the engine cooling can be disassembly, when loosen to remove the spark plug, with a small hose one by one blow the dirt around the net spark plug to prevent spark plug is screwed out sewage into the combustion chamber.
(3) screw around, spark plug electrode and a sealing gasket must be clean and dry without oil, otherwise it will lead to leakage, leakage, spark weakened fault.
(4) installation, first with the sleeve will spark plug alignment screw, gently with the hand screw in screw it to about 1 / 2 length of thread, and then boosting lever fastening. If screw feel poor, should exit check whether the screw or screw threads have no impurity entrainment, must not blind afterburner fastening, so as not to damage the screw, bring disaster to the cylinder head, especially for aluminum alloy cylinder head.
(5) should be required to tighten, too loose will cause leakage, the tight seal loses its elasticity, can also cause leakage. Cone seat type spark plug without gasket, with tightening torque is particularly important.
The spark plug on carbon deposition, product oil is not very serious, use gasoline or kerosene, acetone solvent immersion, integrated carbon softening, with non metal brush net electrode and ceramic core and the shell cavity within the carbon deposition, using compressed air to blow, cut unavailable knife scraping, sanding or dipped in gasoline to burn, to prevent damage to the electrode, the porcelain insulator. After the completion of the cleaning of the spark plug gap check.