Do Car Engines Need Valves Adjusted?

Introduction

Valves are an essential part of any internal combustion engine. They control the flow of air and fuel into and out of the cylinders, and they play a vital role in the engine’s performance. In most engines, the valves are adjusted periodically to ensure that they are operating properly. However, some modern engines are equipped with hydraulic lifters, which eliminate the need for periodic valve adjustments.

Types of Valve Adjustments

There are two main types of valve adjustments:

* Mechanical valve adjustment is performed manually using a feeler gauge and a wrench. This type of adjustment is typically required on older engines that do not have hydraulic lifters.
* Hydraulic valve adjustment is performed automatically by the engine’s hydraulic lifters. Hydraulic lifters use oil pressure to adjust the valve clearance, and they do not require any manual adjustment.

When to Adjust Valves

The frequency of valve adjustments depends on the type of engine and the type of valve adjustment used.

* Mechanical valve adjustment is typically required every 30,000 to 60,000 miles.
* Hydraulic valve adjustment is typically not required, as the hydraulic lifters automatically adjust the valve clearance.

Signs of Misadjusted Valves

There are several signs that may indicate that your engine’s valves need to be adjusted. These signs include:

* Poor engine performance, including decreased power, hesitation, and rough idling
* Increased fuel consumption
* Excessive engine noise, such as ticking or tapping
* Engine overheating
* Exhaust smoke

Consequences of Misadjusted Valves

Misadjusted valves can have several negative consequences, including:

* Decreased engine performance
* Increased fuel consumption
* Engine damage

How to Adjust Valves

Adjusting valves is a relatively complex procedure that should be performed by a qualified mechanic. However, the basic steps involved in adjusting valves are as follows:

1. Remove the valve cover.
2. Locate the valve adjustment screws or nuts.
3. Use a feeler gauge to measure the valve clearance.
4. Adjust the valve clearance by turning the adjustment screws or nuts.
5. Reinstall the valve cover.

Benefits of Valve Adjustments

定期对发动机进行阀门调整可以带来许多好处，包括：

* Improved engine performance
* Reduced fuel consumption
* Extended engine life

Conclusion

Valve adjustments are an important part of maintaining a healthy engine. By ensuring that your engine’s valves are properly adjusted, you can help to improve its performance, reduce fuel consumption, and extend its life.