The diesel knock is damaging because it will have a tremendous force on the main bearings and will cause excessive wear of the piston rings.
The engine will knock.
Diesel engines detonate. Diesel has more potential energy than gasoline, instead of burning evenly, diesel explodes creating a knock or rattle noise.
Jet fuel is kerosene, about the same stuff as diesel. Octane is a number that measures anti-knock properties of fuels. Diesels knock--that's how they work. Jets don't have enough compression to knock. Jet and diesel fuels would measure typically 15-25 "octane anti-knock". Sort of....
Diesel knock is generated due to fully advanced timing and retard conditions. If the timing is retard the fuel will not be burned purely and rapid pressure will be developed and pinking noise will be generated. In a advance condition the fuel is injected in to the combusion chamber before reaching the piston tdc the burning will start suddenly otherhand the piston is being compresses the charge. The combusion should be done at maximum pressure and temperature but in this case the fuel does not burnt at that stage (actually piston wants the load at that time)the pressure is not developing instanteniously rapid pressure developed thats why the diesel knock generates. Another reason for diesel knock if diesel does not have the good cetane number knocking will be generatedTHIS ANSWER HAS SUBMITTED BY LOHITHKUMAR S FROM TATA MOT0RS MANGALORE
It could be lifters ir maybe the car ran hot and the motor damaged.
The knock sensor in a diesel engine detects vibrations caused by abnormal combustion events, such as engine knocking or detonation. It monitors these vibrations and sends signals to the engine control unit (ECU) to adjust fuel timing and injection to prevent damage and optimize performance. By ensuring smooth combustion, the knock sensor helps improve efficiency, reduce emissions, and enhance engine longevity.
A knock sensor listens for the 'knock' (or pinking), that shows that the fuel is exploding, rather than burning. Via the engine management computer, it retards the timing of the spark, until the knocking stops. 'Knocking' can damage valves and piston crowns, if allowed to continue. A knock sensor allows different grades of fuel to be used, without damaging the engine.
The secret knock is knock knock, knock knock knock knock
The first occurrence of the multiple repeated knocks appears in Series 1 Episode 10 - The Loobenfeld Decay:Sheldon: (Knock, knock, knock, knock) Leonard, (Knock, knock, knock, knock) Leonard, (Knock, knock, knock, knock) Leonard...Sheldon: (Knock, knock, knock, knock) Penny, (Knock, knock, knock, knock) Penny, (Knock, knock, knock, knock)Penny, (door opens) Good morning.
Diesel fuel contains sulfur compounds that can react with moisture in the air to produce sulfuric acid. This acid can then accelerate the corrosion of metals like zinc and copper, which are more susceptible to attack in acidic environments. Regular maintenance and using corrosion inhibitors can help mitigate the damaging effects of diesel fuel on these metals.
Knock knock. Who's there? Banana. Banana who? Knock knock. Who's there? Banana. Banana who? Knock knock. Who's there? Banana. Banana who? Knock knock. Who's there? Orange Orange who? Orange you glad I didn't say banana?
knock knock knock sock of ock ock ock my clock clock clock is taping for the knock knock knock