BMW 330ci Flywheel
BMW 330ci Flywheel Problems: Diagnosed
Your car's flywheel serves a very important function: it stores kinetic energy and makes this energy ready for recovery once the clutch is engaged. It also serves as a friction surface for the clutch disc. Because the flywheel is a flat, metallic disc, it can wear over time due to stress caused by the heavy-duty spring of the clutch. Once a flywheel develops a run-out or warping, it can cause a rough-going engine and brake pedal pulsation, among other problems. If you notice your BMW 330ci flywheel acting up, then it is time to look out for any of the following symptoms:
Pulsation of the brake pedal
Like a car's disc brake assembly, the flywheel can develop an uneven wear over time due to the constant engaging and disengaging of the clutch. This warping can be checked by listening to the vibration in the brake pedal and by simultaneously monitoring engine RPM. This checking must be done over time, and you need to see if there is a rise and fall in the RPM of the engine and if the pulsation becomes worse.
Free-spinning starter gear
When you have an old car, you might notice that the starter gear sometimes fails to contact with the teeth of the flywheel. This may be caused by the missing teeth in some areas of the flywheel, causing the starter's pinion gear to just spin and not mate with the flywheel's ring gear. If you notice a spinning that produces a drilling sound, you have to visually check the flywheel for broken teeth. If unchecked, a grinding noise will develop, which means that the flywheel is being damaged by the starter gear.
Slipping of the clutch
If you experience a soft pedal and engagement delay, you probably have a clutch slip. This problem is related to flywheel symptoms since the flywheel gets damaged if the clutch wears out and slips constantly. If unchecked, the flywheel will eventually warp, weaken, and crack, so get under the car and clean excessive oil or grease from the flywheel. Then, check for loose bolts and other serious damage to the flywheel.