M104 Gas Engine Head Gasket Replacement Part 2

Jan 17, 2020


Welcome to Grafco Electric, your go-to resource for expert knowledge on engine repairs and maintenance. In this guide, we will provide you with a comprehensive step-by-step tutorial on M104 gas engine head gasket replacement. Whether you are a DIY enthusiast or a professional mechanic, this detailed video demonstration will equip you with the skills and knowledge required to successfully complete the cylinder head removal and replacement process.

Understanding the Importance of Head Gaskets

Before we delve into the specifics of M104 gas engine head gasket replacement, let's take a moment to understand the importance of head gaskets in an engine's overall performance. The head gasket is a critical component that seals the cylinder head to the engine block, ensuring proper combustion and preventing any leakage between the two parts.

Step-by-Step Guide to Cylinder Head Removal

Step 1: Prepare the Work Area

Prior to starting the cylinder head removal process, it is essential to prepare the work area. Ensure that you have a well-lit and properly ventilated space, with all the necessary tools and safety equipment within reach. Additionally, disconnect the battery to prevent any accidental electrical mishaps.

Step 2: Remove Intake and Exhaust Manifolds

To access the cylinder head, you will first need to remove the intake and exhaust manifolds. This can be accomplished by detaching the necessary bolts and carefully disconnecting any associated components. Take note of their positions and keep track of all the parts for easy reinstallation later.

Step 3: Disconnect Electrical Connections

Before proceeding further, it is important to disconnect any electrical connections associated with the cylinder head. This includes unplugging sensors, ignition coils, and any other components that may obstruct the removal process. Take caution and gently detach these connections to avoid any damage.

Step 4: Remove Valve Cover

Next, you will need to remove the valve cover to gain access to the valve train and camshaft. Carefully detach the necessary bolts and take note of their locations. Lift off the valve cover and set it aside in a safe place, ensuring it does not get damaged.

Step 5: Loosen and Remove Cylinder Head Bolts

With the valve cover removed, it's time to loosen and remove the cylinder head bolts. Make sure to follow the specific torque sequence recommended by the manufacturer to avoid any damage to the engine. Gradually loosen the bolts in a crisscross pattern until they are all fully removed.

Step 6: Lift and Replace Cylinder Head

Once all the cylinder head bolts are removed, carefully lift the cylinder head off the engine block. Be cautious of any remaining connections or hoses that may still be attached. Inspect the head gasket for any signs of damage or wear, and replace it if necessary. When placing the new cylinder head, ensure proper alignment and torque the bolts according to the manufacturer's specifications.

Step 7: Reassembly and Testing

With the cylinder head successfully replaced, it's time to reassemble all the components in reverse order. Follow the steps mentioned earlier, ensuring all connections are properly reattached and fastened. Once everything is in place, reconnect the battery and perform a thorough test to ensure the engine is running smoothly.


Congratulations! You have now completed the M104 gas engine head gasket replacement process. We hope this comprehensive guide has provided you with the necessary knowledge and confidence to tackle this task efficiently. If you have any further questions or need additional assistance, feel free to reach out to the experts at Grafco Electric. Remember, regular maintenance and timely repairs are vital for maximizing the performance and longevity of your gas engine.

About Grafco Electric

Grafco Electric is a trusted name in the automotive industry, specializing in electrical and mechanical solutions. With years of experience and a team of skilled professionals, we aim to serve our customers with top-notch products, services, and expert guidance. Visit our website to explore a wide range of engine parts, accessories, and educational resources to meet all your automotive needs.