How to Deal with Valve Tapping Noise?
1 Answers
Methods to address valve tapping noise: readjust the valve clearance, tighten the locking nut on the adjustment screw if it is loose, and replace severely worn components. Valve tapping noise refers to a continuous knocking sound between the valve stem end and its driving component during engine idling, which intensifies with increasing RPM and remains unchanged with engine temperature variations or misfiring. Below are the causes of valve tapping noise: 1. The adjusted valve clearance has changed (due to poor locking or wear between the valve stem and driving component), or the valve is not properly adjusted. 2. Wear on the valve adjustment screw, loose locking nut, excessive or inconsistent valve clearance. 3. Wear and grooving on the valve spring seat, excessive wear between the valve stem and guide.