What Are the Reasons for Loud Noise After Replacing the Timing Belt?
2 Answers
Reasons for loud noise after replacing the timing belt are as follows: Friction from the timing cover: First, check the assembly if there is any abnormal noise. The noise might be caused by friction between the timing belt and the timing cover. You can loosen the screws on the timing cover by half a turn to see if the noise disappears. Noise from the accessory belt: Next, check the condition of the generator belt, as the noise might be coming from the accessory belt. If the tension of the timing belt is adjusted too tightly, remove the generator and air conditioning power belts to rule out whether the issue lies with these belts. If the timing belt tensioner is faulty, it usually needs to be replaced along with the timing belt. Bearing failure: The noise could also be caused by issues with individual engine bearings. Carefully identify the specific source of the sound.
I've worked on many cars, and there are quite a few common reasons for excessive noise after replacing the timing belt. If the belt is installed too tightly, excessive tension can cause the bearings to squeak; if it's too loose, the belt may slip and produce a clicking sound. If old components like the tensioner pulley or idler pulley aren't replaced, excessive wear can lead to friction noise. Poor-quality belts or mismatched models can also be problematic, as inferior materials tend to generate more friction noise. Additionally, misaligned engine components or a skewed belt position can increase friction, and improperly adjusted hydraulic lifters may contribute as well. New belts often have a break-in period where noise may diminish after a few hundred kilometers, but if the noise persists, it's crucial to return to the repair shop immediately to check the tension and bearing condition. Don't delay—ignoring timing issues can lead to serious engine damage.
