Here's a general outline of the process. Specific steps may vary slightly depending on the year and configuration of your engine. Always consult a service manual specific to your engine for detailed instructions and torque specifications:
1. Preparation:
* Safety First: Disconnect the battery negative terminal. Wear safety glasses and gloves.
* Gather Tools and Parts: You'll need a complete set of metric and SAE sockets, wrenches, a torque wrench, a lifter installation tool (highly recommended), a valve spring compressor, a gasket set (intake, valve cover, etc.), new lifters, and potentially new pushrods if they're damaged. A timing chain alignment tool may be needed if removing the timing chain.
* Drain Oil: Completely drain the engine oil.
* Remove Accessories: Remove the distributor, alternator, power steering pump, air cleaner, and intake manifold. This often involves disconnecting various vacuum lines, wires, and hoses. Take photos or make detailed notes to help you with reassembly.
* Remove Valve Covers: Remove the valve covers to access the rocker arms and pushrods.
2. Removing the Rocker Arms and Pushrods:
* Remove Rocker Arms: Carefully remove the rocker arms and set them aside, keeping them organized. Note their location.
* Remove Pushrods: Remove the pushrods. Keep them organized and note their location. Inspect them for damage; bent pushrods need replacing.
3. Removing the Lifters:
* This is the trickiest part: Some lifters may simply lift out once the pushrods are removed. Others, particularly if they're stuck, will require a lifter removal tool. These tools help you carefully remove the lifters without damaging them or the block. Do not pry them out with a screwdriver.
4. Installing the New Lifters:
* Use the Lifter Installation Tool: Use the appropriate lifter installation tool to carefully install the new lifters into their bores. Ensure they're seated correctly.
5. Reassembly:
* Install Pushrods: Carefully install the pushrods in their correct locations.
* Install Rocker Arms: Install the rocker arms, making sure they're properly seated.
* Adjust Valve Lash (if necessary): Depending on your engine's type (hydraulic or solid lifters), you may need to adjust valve lash after reassembly. Hydraulic lifters generally self-adjust, but you may need to prime them. Solid lifters require precise adjustment.
* Reinstall Components: Reinstall the intake manifold, accessories, valve covers, etc., in the reverse order of removal. Use the correct torque specifications for all bolts and nuts.
* Refill with Oil: Refill the engine with the correct type and amount of oil.
* Check for Leaks: After starting the engine, check for any oil leaks.
Important Considerations:
* Timing Chain: Depending on the extent of the work, you might need to remove the timing chain. If you do this, precisely mark its position to ensure correct reassembly. Improper timing chain alignment can severely damage your engine.
* Engine Compression Test: After reassembly, it's recommended to perform a compression test to verify that the cylinders are performing correctly.
* Professional Help: If you lack experience or confidence, it's strongly advised to take your vehicle to a qualified mechanic. The cost of repairs from mistakes during this process will far exceed the cost of professional labor.
This is a simplified overview. A detailed service manual specific to your engine's year and model is essential for accurate and safe completion of this job. Failing to follow proper procedures can result in serious engine damage.
