What are the symptoms of a damaged hydraulic valve lifter?
1 Answers
Damage to the hydraulic valve lifter can result in insufficient cylinder pressure due to the hydraulic valve pushrod. Below are specific details about hydraulic lifters: 1. Replacement precautions: Hydraulic lifters are not interchangeable; when replacement is necessary, a complete set should be replaced. During assembly, the lifter surface should be coated with engine oil. After installing new hydraulic lifters, do not start the engine immediately within 30 minutes, and initial noise upon engine startup is normal. 2. Working principle: When the camshaft rotates to the working surface, the hydraulic lifter housing and support rise. At this point, the one-way valve is closed, preventing oil from escaping. Due to the incompressibility of the oil, the lifter acts as a solid unit, pushing the valve open against the spring tension. When the camshaft moves past the working surface, the pressure in the high-pressure chamber decreases, allowing the oil to push open the one-way valve again and refill the high-pressure chamber, repeating the cycle.