How to Pump Up Hydraulic Lifters and How Long It Takes

Hydraulic lifters are a critical part of your engine’s valve train system, responsible for maintaining zero valve clearance and reducing wear. When they fail or are filled with oil improperly, you may experience ticking sounds, poor performance, and even damage to other components. In this blog, we’ll explain how to pump up hydraulic lifters properly, how long it takes, and what you should keep in mind for maintenance.

What Are Hydraulic Lifters?

Hydraulic lifters (also known as hydraulic tappets) automatically adjust the clearance between the camshaft and valves. They’re filled with engine oil under pressure, ensuring smooth and silent valve operation.
If air gets trapped inside or oil levels drop, the lifter can’t maintain pressure, resulting in a noisy, inefficient engine.

How to Pump Up Hydraulic Lifters

Properly pumping up your hydraulic lifters ensures they function optimally without noise or wear. Follow these steps carefully:

How Long Does It Take for Hydraulic Lifters to Pump Up?

In most engines, hydraulic lifters will pump up within 10 to 30 minutes of operation after startup. However, this varies depending on:

• Oil viscosity and temperature
• Engine design
• How much air was trapped inside the lifter
• The condition of the oil passages and filters

If the ticking sound continues beyond 30 minutes, one or more lifters may be faulty or clogged with debris and may need to be cleaned or replaced.

Common Causes of Hydraulic Lifter Problems

Hydraulic lifters can fail or lose pressure for various reasons. The most frequent include:

1. Dirty or old oil that clogs internal lifter passages
2. Low oil pressure due to worn-out pumps or filters
3. Air in the system prevents the lifter from maintaining proper pressure
4. Mechanical wear on the camshaft or pushrods

Regular oil changes and the use of OEM-quality parts can prevent these issues and maintain your engine’s longevity.

Maintaining and Replacing Hydraulic Lifters

If your hydraulic lifters show continuous noise, even after cleaning or oil changes, replacement may be necessary. We offer genuine hydraulic pump replacement parts compatible with multiple engine models and small machinery.

You’ll find everything from pumps and filters to valve train components—helping restore your system’s performance and reliability.

Key Takeaways

• Hydraulic lifters automatically maintain valve clearance.
• Pump them up by soaking in oil and letting them self-fill after installation.
• Typical pump-up time: 10–30 minutes of engine operation.
• Persistent ticking often means a deeper issue—inspect, clean, or replace lifters as needed.
• Always use OEM hydraulic lifter parts for durability and consistent pressure performance.