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1. Avoid Cold And Hot. Spark Plugs In Addition To Different Shapes, Different Sizes, But Also Divided Into Cold, Medium, Hot Three. General High Compression Ratio, High Speed Engine Should Use Cold Spark Plug; And Low Compression Ratio, Low Speed Engine Should Use Hot Spark Plug, Between The Two And Medium-Sized Spark Plug. In Addition, The Spark Plug Selection Of New Engine Or Overhauled Engine And Old Engine Can Be Different According To The Actual Situation. For Example, When The Engine Is New, The Choice Of Spark Plug Should Tend To Heat Type; Because Of The Decline In The Performance Of The Old Engine, The Spark Plug Is Easy To Produce Too Much Carbon And Be Contaminated By Oil. The Spark Plug Should Be Medium Or Cold Type To Improve The Ability Of The Spark Plug To Resist Oil Pollution.
2. Avoid Misdiagnosis And Error. When The Spark Plug Is Replaced Or Suspected To Be Faulty And Needs To Be Checked, The Spark Plug Should Be Removed After The Locomotive Runs Normally For A Period Of Time. The Color Characteristics Of The Electrode Can Be Observed Under The Following Circumstances: First, The Central Electrode Is Red-Brown, And The Side Electrode And Surrounding Electrode Are Blue-Gray, Which Is The Appropriate Selection Of The Spark Plug; Second, There Is Ablation Or Melting Phenomenon Between The Electrodes, The Skirt And The Insulator Are Burning White State, Indicating That The Selection Of Spark Plug Is Overheated; Third, There Are Black Stripes Between The Electrodes And The Insulator Skirt, Indicating That The Spark Plug Has Leaked Air. Improper Selection Of Spark Plug Or Air Leakage Should Be Re-Selected Suitable Spark Plug.
3. Avoid Too Tight Installation. The Spark Plug Must Be Installed To The Specified Torque. When Installed With Special Tools, Generally Not More Than, But If The Force Is Too Large, Too Fierce Or When Installed With A Spanner, It Will Often Damage The Spark Plug Porcelain Core Or Make The Screw Slip Buckle, Expansion Groove Fracture And Lead To Scrap Spark Plug; But Do Not Install Too Loose, Otherwise The Engine Will Not Work Normally.
