Master the I.C.E. Method: Adjusting Hydraulic Roller Rocker Arms

Master the I.C.E. Method: Adjusting Hydraulic Roller Rocker Arms

Table of Contents

1. Introduction
2. Understanding Hydraulic Roller Rocker Arms
3. Setting the Preload for Stud Mount Hydraulic Roller Rocker Arms
4. Differentiating Between Hydraulic Roller and Solid Roller Engines
5. Consult the Lifter Manufacturer for Preload Specifications
6. Setting the Exhaust Valve on a Stud Mount Hydraulic Roller Engine
7. Setting the Intake Valve on a Stud Mount Hydraulic Roller Engine
8. Importance of Setting Preload Correctly
9. Checking for Uniform Height of Poly Locks
10. Conclusion

Introduction

Welcome back to the channel! In today's video, we will be discussing the proper technique for adjusting a stud mount hydraulic roller rocker arm. This demonstration will be conducted on our Smedding 383 cubic inch Extreme Engine, specifically the 450 horsepower 470 torque combo. We'll guide you step by step through the process, ensuring that you have a clear understanding of how to adjust rocker arms on a stud mount hydraulic roller engine.

Understanding Hydraulic Roller Rocker Arms

Before we dive into the adjustment process, it's essential to have a basic understanding of hydraulic roller rocker arms. These components play a crucial role in the engine's valve train system. Hydraulic roller rocker arms are designed to actuate the valves in an efficient and precise manner. They are commonly used in high-performance engines to ensure optimal valve lift and duration.

Setting the Preload for Stud Mount Hydraulic Roller Rocker Arms

One of the critical aspects of adjusting stud mount hydraulic roller rocker arms is setting the preload. Preload refers to the amount of pressure applied to the lifter to ensure proper valve operation. It's important to note that different lifters require different preload amounts. Therefore, it is highly recommended to consult the manufacturer's specifications for the specific lifters you are using.

For short travel lifters, a minimal preload of around 30 thousandths may be suitable. However, with full travel standard lifters like the ones used in our engine, a preload of approximately 70 thousandths is recommended. If you are unable to access the lifter manufacturer's guidelines, a general rule of thumb is to run half the preload of the total plunger travel. For example, a plunger with 200 thousandths of travel would require a 100 thousandths preload.

Differentiating Between Hydraulic Roller and Solid Roller Engines

Before proceeding with the adjustment process, it's crucial to determine whether you are working on a hydraulic roller engine or a solid roller engine. This distinction will affect the preload adjustment. In a hydraulic roller engine, there should be no lash present, as the lifter contains a hydraulic plunger. Conversely, a solid roller engine will have lash, as there is no hydraulic element in the lifter.

It is essential to clarify the type of engine you are working on before attempting to adjust the rocker arms. Setting lash on a hydraulic roller engine or assuming zero lash on a solid roller engine can lead to incorrect adjustments and potential engine damage.

Consult the Lifter Manufacturer for Preload Specifications

To ensure accurate preload adjustment, it's always best to consult the lifter manufacturer's guidelines. They will provide you with the specific preload requirements for the lifters you are using. Following the manufacturer's recommendations will guarantee optimal performance and longevity for your engine.

In cases where the lifter manufacturer is unknown, you can use the general rule of half the plunger travel for preload. While this is a good starting point, it's always best to refer to the lifter manufacturer's specifications when available.

Setting the Exhaust Valve on a Stud Mount Hydraulic Roller Engine

Now, let's dive into the adjustment process for stud mount hydraulic roller rocker arms. We'll start by setting the exhaust valve, which is the valve that aligns with the exhaust port. When setting the exhaust valve, it's crucial to position the lifter, pushrod, and camshaft on the base circle of the camshaft. This ensures that the valve is completely closed, providing an accurate adjustment.

To determine the base circle position, we'll use a simple method called the "ICE method." When the intake valve starts to close, it's time to set the exhaust valve. Rotate the engine until you feel the intake valve rising, indicating the start of the closing phase. Once the intake valve has closed completely, you can proceed with setting the exhaust valve.

Take the poly lock adjuster and thread it onto the rocker arm stud. Slowly tighten the adjuster while simultaneously wiggling the pushrod or the rocker arm vertically. This will help remove any vertical lash in the lifter. Keep tightening until you feel the vertical lash completely disappear, indicating proper adjustment.

Setting the Intake Valve on a Stud Mount Hydraulic Roller Engine

With the exhaust valve properly adjusted, we can now move on to setting the intake valve. Again, we'll utilize the ICE method, but this time, we'll focus on the opening of the exhaust valve. When the exhaust valve starts to open, it's time to set the intake valve. Rotate the engine until you observe the exhaust rocker arm beginning to open. This indicates that the intake valve is ready to be adjusted.

Using the same procedure as before, thread the poly lock adjuster onto the rocker arm stud and tighten it while wiggling the pushrod or rocker arm vertically. Continue tightening until the vertical lash is eliminated.

Importance of Setting Preload Correctly

Setting the preload correctly is crucial for the proper functioning of the stud mount hydraulic roller rocker arm. If the preload is insufficient, it can lead to valve float, poor performance, and potential engine damage. On the other hand, excessive preload can prevent the valve from fully closing, resulting in loss of power and possible valve train damage.

To ensure optimal performance, always adhere to the lifter manufacturer's recommendations for preload. This will guarantee that the valve train operates within the specified parameters, leading to a more efficient and reliable engine.

Checking for Uniform Height of Poly Locks

Once you have completed the adjustment process for all the valves, it's essential to check for uniform height of the poly locks. While there may be slight variations due to manufacturing tolerances, all the poly locks should have a similar height.

To check for uniformity, position yourself at the end of the rocker arm and visually inspect the tips of the poly locks. They should be at the exact same height, indicating consistent adjustment across all the valves. If you notice any significant variations, it is advisable to double-check the adjustment on the corresponding rocker arm.

Conclusion

In conclusion, adjusting stud mount hydraulic roller rocker arms requires attention to detail and adherence to manufacturer guidelines. By following the ICE method and consulting lifter specifications, you can confidently set the preload and achieve optimal performance from your engine. Remember to conduct thorough checks and ensure uniformity in poly lock heights. With these steps completed, you'll be ready to hit the road with a well-adjusted valve train and an engine that performs at its best.

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