Jeep 4.0 Engine Bay Diagram

The Jeep engine bay is the space inside the vehicle for the engine. This Jeep 4.0 engine bay diagram gives you insights into the wiring of the engine area so you can easily make maintenance checks.

This diagram will also help you with cleaning the engine bay. Water and brake fluid leaks can cause corrosion in the engine bay that can be prevented with regular cleaning. Also, dirt, gunk, and other debris can change the appearance of your engine which makes regular cleaning quite important.

Jeep 4.0 Engine Bay Diagram

Jeep 4.0 Engine Bay Diagram 02

Jeep 4.0 Engine Bay Diagram 03

Best Cleaning Methods for Jeep 4.0 Engine Bay

If you own a modern car, then you shouldn’t have to worry about spraying the engine bay with water, especially if your vehicle’s engine bay is covered with air boxes and weather-proof wiring connectors throughout the engine bay. You can also pressure wash your engine bay, however, this isn’t really necessary. Avoid using excessive pressure or pressure of 2000 psi and above. If you’re using water to clean the engine bay, stay away from components like the alternator, sensors, and intake.


Avoid using heavy-duty cleaners on your engine bay so you don’t damage any of the engine’s components. You can go for detail spray if you’re trying to clean only a light layer of dust on your vehicle. The dirtier and grimier the area, the tougher the cleaner you should use. If you’re cleaning an oil or fluid leak then a spray-on engine degreaser will be best. However, avoid going for stronger cleaners if you’re not used to them. These might do more damage than cleaning.


Rather than putting your engine bay through the torture of a cleaner, you could go with the same brushes you use on your wheels and tires. You can use them for light layers of dust and wipe with a cloth afterward.

Air Drying

Using compressed air is a great way to dry off your car though it won’t help when you have to clear tough stains and dirt.

Precautions To Take When Cleaning An Engine Bay

When done right, cleaning your engine bay could keep your engine running smoothly, however, opening the hood and pounding the engine bay with your pressure washer can cause some engine problems if you don’t apply the right precautions.

Avoid spraying directly at the alternator

When using a pressure washer, you might want to cover up the alternator with plastic to avoid getting it wet.  Getting water inside might not lead to serious damages but you might have to worry about engine problems later on.

Cover any exposed filters

If there are any filters that feed directly into the engine, they should be covered before you start using your pressure washer. If not, water can get into the engine through these filters which can cause hydro locking. When this happens, the engine will have to be rebuilt or replaced.

If your Jeep vehicle features a sealed factory air box, then you won’t have to worry about any exposed air filters but you should avoid spraying directly at them to be safe.

Avoid spraying any belts

The serpentine belt will deteriorate when it gets wet from rain and snow or even on a damp morning. If you’re not ready to spend some bucks on replacing the belt, then you should keep water away from the belt or avoid spraying at them directly.

Avoid cleaning while the engine is hot.

This is a big risk that might not only damage some materials in your engine but also could lead to some burns. Regardless of the cleaning method, you’re going for, you should wait till your engine cools down before cleaning.

How to Clean Your Jeep 4.0 Engine Bay

Cleaning the engine bay is a simple process that will take a few minutes or more to complete depending on how dirty your engine bay is and how clean you want it to be. Once you’ve taken all the necessary precautions and ensured that your engine is cool to the touch, you can follow the steps below to clean the engine bay.

Take note that the steps here are for those that want to clean more than just a light layer of dust. There is no need to use a pressure washer on your engine bay if you can get it clean with a brush.

Plan it out

Before you start, plan out how you want to clean the engine. You should break the cleaning process down into sections. You won’t want to go back to an area you’ve cleaned before when touching up your engine bay. Start from the top down – inside the hood, the left side, center, right side, and then finish with the front and support area.


To get started, you will have to get it wet. Get a garden hose with the nozzle on a shower setting. This pressure is just about the same as gentle rain so it won’t cause any damage. Spray down the engine bay including the front fenders and other surrounding panels. This will prevent any staining on the painted surfaces of the vehicle.

Spray your cleaner

Spray your cleaner and keep your wheel cleaning bucket with all your brushes by your side. You might have to swap the cleaner with the brush from time to time depending on the type of dirt you come across. When cleaning, focus on areas that are more noticeable and avoid going down the sides of the engine.


When you’re done cleaning, spray the surrou8nding panel again to make sure nothing dries on them.

Dry it Off

If you have a leaf blower, it will come in handy in the post-cleaning process. When you’re done cleaning, turn on the leaf blower and use the compressed air to get rid of the standing water throughout the engine bay. When done, start the engine and let it warm up to operating temperature. This will help any remaining water to evaporate and also confirms that your engine is working fine.


  • Keith Rowland

    Keith Rowland is a seasoned electrician who enjoys fixing faults in home appliances and electronics. Being someone who loves writing, he shares on this blog, DIY tips on how to fix various devices within a few minutes. When he's not fixing stuff or writing a new blog post, he's playing with his two cute girls and their mom.