What Are the Causes of Belt Noise During Cold Start?
3 Answers
The causes of belt noise during cold start are: 1. The belt tightens due to low temperature before ignition, resulting in noise; 2. Severe belt aging with its service life nearing the limit; 3. The belt is either too loose or too tight. The functions of the belt are: 1. Ensuring accurate intake and exhaust timing; 2. Synchronizing engine ignition with cylinder movement; 3. Ensuring smooth power output from the engine. The method for replacing the vehicle belt is: 1. Lift the vehicle and remove the right front wheel fender liner; 2. Remove the generator belt and the generator belt tensioner; 3. Loosen the crankshaft pulley screw; 4. Open the engine hood and remove the water tank; 5. Remove the engine mounting bracket and the protective cover on the belt; 6. Unscrew the generator fixing screw and remove the generator; 7. Remove the cylinder block mounting bracket and take off the crankshaft pulley; 8. Rotate the crankshaft to the top dead center position of the cylinder and mark it; 9. Remove the belt and the tensioner.
There are several key reasons for belt squealing during cold starts. As someone who frequently repairs cars, I've found most cases are caused by belt aging or hardening. In cold weather, rubber belts stiffen and shrink, leading to insufficient friction that causes slipping and squealing. Another common factor is tensioner pulley wear - it controls belt tightness, and if the bearing is damaged the belt will loosen and make noise. Belt surfaces contaminated with oil or dust can also slip and produce sounds. Ignoring this may lead to belt breakage, affecting alternator or AC operation and creating safety risks. I recommend owners listen carefully after each cold start and visually inspect belts for cracks. If aging is detected, replace the belt promptly and adjust tension to prevent long-distance issues. Regular maintenance like cleaning surface contaminants can extend belt lifespan and reduce noise.
I totally relate to the issue of belt squealing during cold starts. My car used to make annoying squeaking noises every winter. After some research, I found out it's caused by the belt contracting, hardening, and slipping in cold conditions. Possible reasons include belt aging/hardening, loose tensioner pulley, or oil contamination. The noise disappears when the engine warms up because the belt regains elasticity. My advice: first inspect the belt surface - replace and tighten it immediately if cracked. Delaying repairs risks sudden belt failure, which could disable headlights and AC - quite dangerous. For simple maintenance, you can try applying belt silicone spray, but professional repair is more reliable. Paying extra attention to cold-weather maintenance can prevent this hassle.
