Updated: Jan 8
An exhaust manifold is an essential component of a vehicle's exhaust system that collects exhaust gases from the engine and directs them through the exhaust pipe.
Over time, the exhaust manifold can become damaged or develop leaks, leading to reduced engine performance and increased emissions. In such cases, it is necessary to replace the exhaust manifold.
In this article, we will discuss how to replace an exhaust manifold in a step-by-step manner, including the tools and equipment required, how to remove the old manifold, and how to install the new one.
Table of Contents:
How Much Does It Cost to Replace an Exhaust Manifold?
The cost of replacing an exhaust manifold can vary depending on several factors, such as the make and model of the vehicle, the type of manifold (cast iron or stainless steel), and the location of the manifold (front or rear).
On average, you can expect to pay anywhere from $200 to $1,000 (about £150 to £750 or €180 to €900) for a new exhaust manifold.
Keep in mind that this price does not include labor costs, which can range from $100 to $300 (about £75 to £225 or €90 to €360) per hour.
How Hard Is It to Replace a Manifold?
The difficulty of replacing an exhaust manifold will depend on your level of mechanical skills and the accessibility of the manifold on your particular vehicle.
In general, replacing an exhaust manifold can be a challenging task that requires a certain level of knowledge and experience. You will need to be comfortable working with hand tools and have a good understanding of how the exhaust system works.
It is also helpful to have a service manual for your vehicle, as it will provide detailed instructions and diagrams to help guide you through the process.
How Long Does It Take To Replace the Exhaust Manifold?
The time it takes to replace an exhaust manifold will depend on the complexity of the job and your level of experience.
As a general rule, you can expect the job to take anywhere from 3 to 8 hours. This includes the time required to remove the old manifold, prepare the new one, and install it.
Keep in mind that this is just an estimate and the actual time may vary depending on the specific circumstances of your vehicle.
Make Sure the Exhaust Manifold Needs Replacing
Before you start the process of replacing the exhaust manifold, it is important to make sure that it actually needs to be replaced. There are a few key signs that you should look for.
Check for Symptoms of an Manifold Exhaust Leak: One of the most common symptoms of an exhaust manifold leak is a loud, rumbling noise coming from the engine. Other symptoms may include reduced engine performance, an increase in exhaust emissions, and a decrease in fuel efficiency.
Check the Exhaust Manifold for Leaks: To check for leaks in the exhaust manifold, you will need to perform a visual inspection. Look for any cracks, holes, or other signs of damage. You can also use a soapy water solution to check for leaks. Simply apply the solution to the manifold and look for bubbles, which indicate a leak.
Obtain the Right Exhaust Manifold Replacement Part
Once you have determined that the exhaust manifold needs to be replaced, the next step is to obtain the correct replacement part.
The best way to do this is to consult a service manual for your vehicle or contact a dealership or auto parts store. Make sure to provide them with the make, model, and year of your vehicle, as well as the engine size and type.
It is also a good idea to compare prices and consider purchasing the part online, as this can often be a more cost-effective option.
Prepare Tools & Equipment for Replacing an Exhaust Manifold
Before you begin the process of replacing the exhaust manifold, it is important to gather all of the necessary tools and equipment. Below is a list of items that you will need.
Flashlight (preferably a head mounted one)
New gaskets (manifold and down pipe gasket)
Penetrating oil (preferably specialist penetrating WD-40)
Replacement exhaust manifold
Safety glasses and gloves
You may also need new coolant if you need to remove any coolant lines to gain access to the exhaust manifold.
An impact wrench and impact sockets will also make it easier to replace an exhaust manifold.
How to Remove an Exhaust Manifold
Once you have gathered all of the necessary tools and equipment, you are ready to begin the process of removing the old exhaust manifold. Follow the steps below.
Make sure the exhaust manifold needs replacing: Before you begin, double-check that the exhaust manifold actually needs to be replaced. As mentioned earlier, you can do this by checking for symptoms of an exhaust leak and performing a visual inspection for cracks or holes.
Gain access to the exhaust manifold: Depending on the make and model of your vehicle, the exhaust manifold may be located in different areas. Consult a service manual or online guide to determine the exact location of the manifold on your vehicle.