How to Change a Car Engine

Tools and Materials You’ll Need

New engine
Engine hoist
Floor jack
Jack stands
Wrench set
Socket set
Screwdriver set
Pliers
Oil filter wrench
Coolant drain pan
New oil filter
New coolant
New spark plugs
New drive belts
New hoses

Safety Precautions

Wear safety glasses and gloves at all times.
Disconnect the negative battery terminal before starting any work.
Let the engine cool down completely before starting to work on it.
Use an engine hoist to lift the engine out of the car.
Be careful not to damage any of the engine components when removing or installing it.
Tighten all bolts and nuts to the specified torque.

Step-by-Step Instructions

Disconnect the battery. Disconnect the negative battery terminal using a wrench.
Drain the coolant. Place a coolant drain pan under the radiator and open the drain petcock. Allow the coolant to drain completely.
Remove the air intake system. Remove the air filter housing and intake manifold using a wrench or socket set.
Remove the exhaust system. Unbolt the exhaust manifold and catalytic converter using a wrench or socket set.
Disconnect the fuel lines. Disconnect the fuel lines from the fuel injectors using a wrench or socket set.
Disconnect the electrical connections. Disconnect all electrical connectors from the engine using a screwdriver or pliers.
Remove the engine mounts. Remove the bolts or nuts that secure the engine mounts to the frame using a wrench or socket set.
Lift the engine out of the car. Use an engine hoist to lift the engine out of the car. Be careful not to damage any of the engine components.
Install the new engine. Lower the new engine into the car using an engine hoist. Be careful not to damage any of the engine components.
Reinstall the engine mounts. Bolt or nut the engine mounts to the frame using a wrench or socket set.
Reconnect the electrical connections. Reconnect all electrical connectors to the engine using a screwdriver or pliers.
Reconnect the fuel lines. Reconnect the fuel lines to the fuel injectors using a wrench or socket set.
Reinstall the exhaust system. Bolt the exhaust manifold and catalytic converter using a wrench or socket set.
Reinstall the air intake system. Reinstall the air filter housing and intake manifold using a wrench or socket set.
Fill the engine with coolant. Fill the radiator with coolant until it reaches the full mark.
Start the engine and check for leaks. Start the engine and let it idle for a few minutes. Check for any leaks from the engine, coolant system, or fuel system.

Tips

If you’re not comfortable changing an engine yourself, you can have it done by a mechanic.
Be sure to follow all safety precautions when changing an engine.
Take your time and don’t rush the process.
If you have any questions, consult a professional.