By default, diesel engines produce a louder roar than their gas engine counterparts. However, not all loud noises are normal. Sometimes diesel engines will begin to make excessive, worrisome sounds. The engine may begin to clang, grind, or rattle. Many times, these sounds are indicative of a problem. However, there are many components and small systems that make up a diesel engine, so finding the exact cause of a noise can be challenging. As a result, many motorists rely upon an excessive noise diagnosis to help find the issue affecting their respective diesel engines. Possible causes of excessive noise include faulty rods, injectors, pistons, and valves. Loud noises may also result from low oil levels or if pressure in the engine is off. Repair techniques and costs will vary depending on the component needing repair, but an early diagnosis can ultimately prevent costlier repairs in the future.