1. Safety First:
* Disconnect the battery's negative terminal. This prevents electrical shorts.
* Support the engine. Use a sturdy engine hoist or jack stands placed under the engine's oil pan or a suitable strong point *before* you start removing anything. Improper support could lead to serious injury or engine damage.
2. Access the Broken Mount:
* Identify the broken mount. Visually inspect all three engine mounts. The broken one will be obvious – cracked, separated, or severely deteriorated rubber.
* Remove any interfering components. This might involve removing air cleaner assemblies, various hoses, wiring harnesses, or even parts of the exhaust system to gain adequate access. Take pictures as you go to help with reassembly.
3. Mount Removal:
* Locate and remove the mount's attaching bolts. These are usually located on both the engine block and the frame. They're often rusted and may require penetrating oil (like PB Blaster) and significant force to remove. Use the correct size sockets and wrenches, and avoid stripping the bolt heads. A breaker bar or impact wrench can be very helpful.
* Carefully separate the broken mount from the engine and frame. The old rubber mount may be stuck, requiring some gentle persuasion. Avoid damaging the engine block or frame during this process.
4. Installation of the New Mount:
* Obtain a replacement engine mount. Ensure you get the correct part for your 1970 Chevelle. The parts store will need to know the engine type (e.g., small block, big block, etc.). Consider using high-quality polyurethane mounts for increased durability compared to the original rubber.
* Carefully align the new mount. Ensure proper seating on both the engine and frame.
* Install the attaching bolts. Tighten them to the manufacturer's specified torque. A torque wrench is crucial here to prevent over-tightening and damage.
5. Reassembly:
* Carefully reinstall all components removed during the access phase, referring to your pictures.
* Lower the engine carefully with the hoist or jack stands. Make sure everything aligns correctly before fully lowering.
* Reconnect the battery's negative terminal.
6. Testing:
* Start the engine and check for any unusual noises or vibrations. If there are still vibrations, double-check all bolts are tightened and the mount is properly installed. You might have a secondary issue.
Important Considerations:
* Rust: On a 1970 Chevelle, rust is a significant factor. Expect to spend time dealing with rusted bolts and possibly damaged threads. Replacing bolts is often necessary.
* Tools: You'll need a variety of tools, including sockets, wrenches, penetrating oil, a torque wrench, possibly an impact wrench, and potentially a jack and engine hoist.
* Mechanical Knowledge: This is not a beginner's job. If you're not comfortable with engine work, consider taking it to a professional mechanic. Improper installation could lead to serious damage or injury.
This is a generalized overview. A detailed, model-specific repair manual for your 1970 Chevelle will be invaluable for precise instructions and torque specifications. These manuals are often available online or from automotive parts stores. Consulting such a manual is highly recommended before attempting this repair.
