Fix engine lifter ticking noise

Stop the Noise: Why Engine Lifters Tick and How You Can Fix It

The sound of ticking in an engine can be unsettling, especially if you’re not sure what’s causing the noise or how serious the issue might be. Lifters, also known as hydraulic tappets or cam followers, are an essential part of your engine’s valvetrain, responsible for maintaining proper valve clearance. When you notice a lifter ticking noise, it’s often a sign that something isn’t working as it should. Understanding why engine lifters tick and what you can do about it can help you address the problem before it leads to more significant engine damage.

Common Causes of Lifter Ticking Noise

There are several potential causes of lifter ticking noise, ranging from minor issues that are easy to fix to more serious problems that require professional attention. Here are some of the most common reasons why engine lifters might start ticking:

1) Dirty Engine Oil— One of the most common causes of lifter ticking noise is low or dirty engine oil. Lifters rely on a steady supply of clean oil to function properly. If the oil level is too low, or if the oil is dirty and full of sludge, it can prevent the lifters from getting the lubrication they need, leading to ticking.
2) Low Oil Level— When the oil level is low, the lifters may not be adequately lubricated or pressurized, causing them to tick. Checking and topping off the oil can often resolve this issue.
3) Lifter Wear or Damage— Lifters can wear out or become damaged over time, especially in high-mileage engines. As lifters wear, they can develop excessive clearance, leading to a ticking noise. In some cases, the lifter may become stuck or fail to adjust properly, causing a persistent tick.
4) Improper Valve Adjustment— In engines with solid lifters, the valve clearance needs to be adjusted periodically to ensure proper operation. If the valves are not adjusted correctly, it can lead to excessive clearance and lifter ticking noise.
5) Low Oil Pressure Issues— Hydraulic lifters rely on oil pressure to function properly. If the oil pressure is too low, it can prevent the lifters from maintaining proper valve clearance, leading to a ticking noise.
6) Cold Start Tick— Some engines, particularly those with hydraulic lifters, may experience a ticking noise on cold start-up. This is often due to the lifters draining of oil while the engine is off. When the engine is started, it takes a few moments for the oil to reach the lifters and quiet the ticking noise.

How to Fix Lifter Ticking

Fixing lifter ticking depends on identifying the underlying cause. Here are some steps you can take to address the issue:

• Check and Top Off the Oil: Start by checking the engine oil level. If it’s low, add oil to bring it to the correct level. If the oil is dirty, consider changing the oil and filter. This simple step can often resolve ticking caused by inadequate lubrication.
• Use an Engine Cleaner or Additive: If the ticking is due to dirty lifters, you can try an engine cleaner or a lifter additive. However, it’s important to follow the bottle directions—more is not better.

Chemical treatments to fix lifter noise work by dissolving and removing varnish and sludge buildup in the lifter itself, the oil port in the lifter, and the oil passages.

The treatments are usually a combination of a cleaning agent and very light oil. In many cases, they’re nothing more than automatic transmission fluid and detergent.

In some cases, the treatments can be left in for the entire oil change, while other treatments are designed to be drained out with the oil after running for a specified period of time or until the lifter tick noise stops.

• Address Oil Pressure Issues: If low oil pressure is the cause of your lifter ticking noise, it’s essential to diagnose and fix the underlying cause. This may involve replacing the oil pump, cleaning the oil passages, or addressing other issues that could affect oil pressure.
• Perform a Valve Adjustment: For engines with solid lifters, a valve adjustment may be necessary to eliminate ticking. This task should be performed by a professional mechanic, as it requires precise measurements and adjustments.
• Replace Worn or Damaged Lifters: If the lifters are worn or damaged, they may need to be replaced. This is a more involved repair that requires removing the valve covers and possibly the cylinder heads to access the lifters. It’s best to have this work done by a qualified mechanic.

How a hydraulic lifter works

Engine oil pressure fills the hydraulic lifter through one of the oil galleries in the block or head (depending on whether the engine is an overhead valve (OHV) or overhead cam (OHC)). In an OHV engine, the camshaft lobe pushes up on the base of the lifter. The lifter body pushes up on the oil and inner plunger and cap, which moves the plunger up, exerting an upward force on the push rod.

In an OHC system, the camshaft lobe pushes down on the bucket lifter, which moves the plunger and cap against the valve stem, opening the valve.

©, 2023 Rick Muscoplat