Valve lashing is an important aspect of engine maintenance that is often overlooked. It refers to the clearance between the valve stem and the rocker arm or camshaft lobe. If the valve lash is not properly adjusted, it can cause a host of problems, including poor engine performance, increased fuel consumption, and even engine damage. In this article, we will explore what valve lashing is, why it is important, and how to adjust it.
What Causes Valve Lash?
Valve lash is caused by the natural wear and tear of the engine components. Over time, the valve stem and rocker arm or camshaft lobe can wear down, causing the clearance between them to increase. This can lead to a variety of problems, including reduced engine performance, increased fuel consumption, and even engine damage. In addition, the valve lash can be affected by changes in temperature and humidity, which can cause the metal components to expand or contract.
Types of Valve Lash
There are two types of valve lash: intake and exhaust. The intake valve is responsible for allowing air and fuel into the engine, while the exhaust valve is responsible for expelling the combustion gases. The valve lash for each valve must be adjusted separately, as they can wear down at different rates. In general, the exhaust valve lash is larger than the intake valve lash, as the exhaust gases are hotter and can cause more wear and tear on the components.
Why is Valve Lash Important?
Valve lash is important because it affects the engine's performance and longevity. If the valve lash is too large, it can cause the valve to open too late or close too early, reducing the amount of air and fuel that enters the engine. This can lead to poor engine performance, increased fuel consumption, and even engine damage. On the other hand, if the valve lash is too small, it can cause the valve to remain open too long, which can also reduce engine performance and increase fuel consumption. In addition, a small valve lash can cause the valve to burn out, which can lead to expensive repairs.
Benefits of Proper Valve Lash Adjustment
Proper valve lash adjustment can provide several benefits, including increased engine performance, improved fuel efficiency, and longer engine life. By adjusting the valve lash, you can ensure that the valves are opening and closing at the correct time, which can increase the amount of air and fuel that enters the engine. This can lead to improved engine performance and better fuel efficiency. In addition, proper valve lash adjustment can reduce the amount of wear and tear on the engine components, which can increase the engine's lifespan.
How to Adjust Valve Lash
Adjusting valve lash requires a few basic tools and some knowledge of engine mechanics. The first step is to locate the valve lash adjustment screws, which are typically located on the rocker arm or camshaft. Next, you will need to remove the valve cover, which is usually held in place by a series of bolts or screws. Once the valve cover is removed, you can access the valve lash adjustment screws.
To adjust the valve lash, you will need to use a feeler gauge to measure the clearance between the valve stem and the rocker arm or camshaft. The exact clearance will vary depending on the make and model of the engine, so it is important to consult the manufacturer's specifications. Once the clearance has been measured, you can use a wrench to adjust the valve lash adjustment screw until the desired clearance is achieved.
When to Adjust Valve Lash
Valve lash should be checked and adjusted periodically, as part of routine engine maintenance. The exact interval will vary depending on the make and model of the engine, so it is important to consult the manufacturer's recommendations. In general, valve lash should be checked every 30,000 miles or so, or as part of a major engine overhaul. In addition, valve lash should be checked if you notice any of the following symptoms: poor engine performance, increased fuel consumption, or unusual engine noises.
Conclusion
Valve lash is an important aspect of engine maintenance that should not be overlooked. By understanding what valve lash is, why it is important, and how to adjust it, you can ensure that your engine is running at peak performance and that it will last for many years to come. Whether you are a seasoned mechanic or a novice DIYer, checking and adjusting valve lash is a simple and straightforward process that can provide significant benefits for your engine.
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