How to Dissolve Urea Crystals?
2 Answers
Since urea has certain water solubility, if urea crystals form, simply clean the urea pipe and nozzle with boiling water. Automotive urea, also known as diesel exhaust fluid, is a liquid used to reduce nitrogen oxide pollution in diesel vehicle emissions, utilizing the SCR (Selective Catalytic Reduction) system. Below are some relevant introductions about automotive urea: 1. Regularly inspect and maintain the system to prevent urea crystallization and blockage in the urea nozzle and pipelines. 2. Use high-quality diesel and urea fluid to avoid impurities caused by poor fuel or urea fluid quality, which may lead to catalytic converter failure. 3. Replace urea filters, air filters, etc., periodically to ensure the SCR system functions properly.
I'm a long-haul truck driver and often encounter urea crystallization near the exhaust pipe nozzle. A simple method is to use warm water with a soft brush to gently scrub, keeping the water temperature below 60°C to prevent part deformation. For particularly stubborn crystal deposits, a commercially available urea crystal cleaner sprayed on and left for ten minutes works well. But remember, never use brute force to scrape it off, as this can easily damage the nozzle coating! Regularly using genuine urea fluid and driving at high speeds every 3,000 to 5,000 kilometers to maintain exhaust temperature can prevent crystallization. If the nozzle gets completely clogged, it's best to take it to a repair shop for disassembly and cleaning—they use specialized ultrasonic equipment for a thorough clean.
