Automobile And Automotive Technicals

DEF (Diesel Exhaust Fluid) is a non-toxic, colorless liquid composed of 32.5% high-purity urea and 67.5% deionized water, used to reduce harmful nitrogen oxide emissions from diesel engines.  How DEF Works Selective Catalytic Reduction (SCR): Modern diesel vehicles use an SCR system to inject DEF into the exhaust stream.  Chemical Reaction: Heat converts the injected fluid into ammonia, which breaks down hazardous nitrogen oxide (\(NO_{x}\)) gases into safe nitrogen and water vapor.  Emissions Reduction: This process cuts \(NO_{x}\) emissions by up to 90%, helping heavy-duty trucks and diesel vehicles meet environmental regulations.   Key Operational Facts Not a Fuel Additive: DEF is stored in a completely separate tank—usually marked with a bright blue cap—and never mixes with diesel fuel.  Consumption Rate: Vehicles typically consume DEF at a rate of about 2% to 3% of their diesel fuel consumption.  Freezing Poin...

A lubricant is generally a fluidic material with the primary function of reducing friction between surfaces in contact. Lubricant minimises energy loss generated from friction; at the same time it can also be very useful to clean, cool, and prevent metal parts from corrosion & rust and many such challenges a machine faces during its operation. For Example: Engine oil is a specific type of lubricant that is developed for application in engines. A good quality engine oil is very essential for the appropriate working of an engine; this helps to operate engine efficiently, prevents from damages and helps in extending the life of the engine. Composition of a Lubricant: A lubricant is composed of two substances: Base Oils and Additives Base oils make-up most of the volume of a lubricant and can either be made of a mineral oil or of a synthetic oil. Mineral base oil can be obtained from a distilling process while refining crude oil, and Synthetic base oils are made by further refini...

Dashboard Warning Lights or Malfunction Indicator Lights (MIL) which roadies should never ignore!  * Electric Power Steering (EPS): If this light appears, your steering may become heavy or stop responding entirely. Drive cautiously and have it inspected immediately. * EPC (Electronic Power Control): This indicates a problem with the throttle system, accelerator pedal, or throttle body. It can cause reduced engine power — avoid pushing the car and get it diagnosed right away. * Check Engine Light: The most common warning light! It can point to issues with sensors, the air-fuel ratio, or other engine components. A quick diagnostic scan can save you from expensive repairs later. * Traction Control Warning: Your anti-skid system may be disabled or malfunctioning. This could be due to a faulty wheel sensor, ABS module, or throttle issue. * ABS (Anti-lock Braking System):  Your brakes will still function, but you’ll lose stability during sudden stops. Definitely not something to ign...

Types of Wheel Alignment :  There are three main types of wheel alignment:  camber ,  caster , and  toe . Each of these refers to a different angle of the wheel in relation to the vehicle. Camber: Camber is the angle of the wheel when viewed from the front or rear of the vehicle. A positive camber means that the top of the wheel is tilted outward from the center of the vehicle, while a negative camber means that the top of the wheel is tilted inward. Camber affects the stability and cornering ability of the vehicle. Too much or too little camber can cause uneven tire wear and reduced traction.   Caster: Caster is the angle of the steering axis when viewed from the side of the vehicle. A positive caster means that the steering axis is tilted toward the rear of the vehicle, while a negative caster means that it is tilted toward the front. Caster affects the steering and handling of the vehicle. A positive caster provides better stability and steering feedback...

The accompanying image is a guide to identifying car fluid leaks based on color and location. Here's a breakdown: Coolant: Slimy green, pink, or yellow, leaking from the radiator, hoses, or water pump.  Water: Clear and thin, from A/C condensation or the exhaust system. Windshield Wiper Fluid: Thin and bluish, from a cracked reservoir or wiper fluid lines. Power Steering Fluid: Thin, red or light brown, from the power steering reservoir, pump, or hoses. Brake Fluid: Yellowish/light brown, slippery, from the master cylinder, brake lines, or wheel cylinders. Motor Oil: Light brown or black, medium consistency, from the oil pan, valve covers, or oil filter. Transmission Fluid: Light brown/black, thicker than engine oil, from the transmission pan, torque converter, or fluid lines. Differential Fluid: Light brown/black, thicker than engine oil, from the pinion seal. Fuel: Smells like fuel, from the fuel tank, pump, lines, or injectors. If a leak is suspected, this guide can help determi...

Power generation in petrol vis-a-vis diesel engine.  .  .  .  * Automobile_And_Automotive_Technicals (an initiative by Indian Roadie),   * Indian Roadie Knowledge Hub