How to Run in a Rebuilt Car Engine

Introduction

Rebuilding a car engine is a major undertaking, but it can be very rewarding. A well-rebuilt engine can last for many years and provide you with years of trouble-free driving. However, it is important to run in the engine properly after it has been rebuilt. This will help to ensure that the engine is properly lubricated and that all of the components are working together properly.

What is Running In?

Running in is a process of gradually increasing the load on an engine over a period of time. This helps to seat the piston rings and other components and to ensure that the engine is properly lubricated. Running in should be done over a period of 500 to 1000 miles, and it is important to follow the manufacturer’s instructions carefully.

Preparing the Engine for Running In

Before you start running in the engine, there are a few things you need to do to prepare it.

Change the oil and filter. This will help to remove any metal shavings or other debris that may have been left behind from the rebuild.
Install new spark plugs. This will help to ensure that the engine is getting the proper spark.
Check the coolant level and top it off if necessary.
Check the battery and make sure it is fully charged.

Running In the Engine

To run in the engine, follow these steps:

Start the engine and let it idle for 10 minutes. This will help to warm up the engine and circulate the oil.
Drive the car for 10 miles at a speed of 20-25 mph. This will help to seat the piston rings.
Let the car cool down for 10 minutes.
Repeat steps 2 and 3 for the next 500-1000 miles.

Tips for Running In

Here are a few tips for running in a rebuilt car engine:

Do not exceed the speed limit during the running in period.
Do not tow any heavy loads during the running in period.
Change the oil and filter every 500 miles during the running in period.
Listen to the engine for any unusual noises. If you hear any noises, stop driving and have the engine checked out by a mechanic.

Conclusion

Running in a rebuilt car engine is an important step in ensuring that the engine lasts for many years to come. By following the steps outlined in this article, you can help to ensure that your rebuilt engine is properly lubricated and that all of the components are working together properly.