Valve covers are one of the most important parts of our engines, as they protect the internal components from dirt, moisture, and other contaminants. While traditional valve covers are made from metal, many newer vehicles use composite plastic valve covers. These are more lightweight and can be designed in a variety of shapes and sizes. However, they are not as durable as metal covers and can crack easily.
If you have a cracked composite plastic valve cover, it’s important to repair it as soon as possible. A cracked valve cover can let dirt, moisture, and other contaminants into the engine, leading to serious damage and costly repairs. Fortunately, repairing a cracked composite plastic valve cover is not difficult and can be done with some basic tools.
Tools and Materials Needed
Before you begin, make sure you have the following tools and materials on hand:
- Masking tape
- Epoxy putty
- Pliers
- Utility knife
- Sandpaper
Step 1: Prepare the Valve Cover
The first step is to prepare the valve cover for repair. Begin by removing any old gaskets or seals. Use a pair of pliers to carefully remove any old components that may be stuck to the valve cover. Once you’ve removed all of the old components, use a utility knife to remove any remaining debris from the surface of the valve cover.
Once the surface is clear, use a piece of masking tape to cover the area around the crack. This will help to keep any epoxy from getting into other areas of the valve cover. Once the area is taped off, use a piece of sandpaper to lightly sand the area around the crack. This will help the epoxy adhere to the surface of the valve cover.
Step 2: Apply the Epoxy
Once the area is prepped, it’s time to apply the epoxy. Begin by kneading the epoxy putty until it becomes pliable. Once it’s ready, roll the putty into a snake-like shape and place it directly onto the crack. Use your fingers to gently press the epoxy into place. Once the epoxy is applied, use a utility knife to trim away any excess material.
Once the epoxy is applied, allow it to cure for at least 24 hours. This will allow the epoxy to fully set and bond with the surface of the valve cover.
Step 3: Clean the Valve Cover
Once the epoxy is fully cured, it’s time to clean the valve cover. Begin by removing the masking tape from the surface of the valve cover. Then, use a damp cloth to wipe away any excess epoxy that may have oozed out from the crack. Once the surface is clean, use a dry cloth to buff the surface of the valve cover.
Step 4: Reinstall the Valve Cover
Once the valve cover is clean, it’s time to reinstall it. Begin by carefully placing the valve cover onto the engine block. Make sure that the valve cover is properly aligned and that all of the bolts are securely tightened. Once the valve cover is in place, replace any gaskets or seals that you may have removed earlier.
Once everything is in place, start the engine and allow it to run for a few minutes. This will help to ensure that the epoxy has properly sealed the crack.
Frequently Asked Questions
What is a composite plastic valve cover?
A composite plastic valve cover is a lightweight valve cover that is used on many modern vehicles. These valve covers are designed to be lightweight and can be designed in a variety of shapes and sizes.
How do I know if my valve cover is cracked?
If you notice any fluid leaking from the valve cover, or if you notice any cracks or splits in the surface of the valve cover, then it’s likely that the valve cover is cracked.
How do I prepare the valve cover for repair?
Before applying the epoxy, it’s important to prepare the valve cover for repair. Start by removing any old gaskets or seals. Use a piece of masking tape to cover the area around the crack, and use a piece of sandpaper to lightly sand the area around the crack. This will help the epoxy adhere to the surface of the valve cover.
How long does it take for the epoxy to cure?
It typically takes at least 24 hours for the epoxy to fully cure. It’s important to allow the epoxy to fully cure before reinstalling the valve cover.
Can I use epoxy to repair other parts of the engine?
Epoxy can be used to repair other parts of the engine, such as gaskets and seals. However, it’s important to make sure that the epoxy you’re using is designed for automotive use.
What do I do if the epoxy doesn’t adhere to the valve cover?
If the epoxy isn’t sticking to the valve cover, it’s likely that the surface wasn’t properly prepared. Make sure that the area is free of debris and that you’ve used a piece of sandpaper to lightly sand the area around the crack. This will help the epoxy adhere to the surface of the valve cover.
How often should I check my valve cover for cracks?
It’s important to regularly inspect your valve cover for any signs of cracks or damage. If you notice any cracks or splits in the surface of the valve cover, it’s important to repair it as soon as possible.
Can I repair a cracked composite plastic valve cover myself?
Yes, you can repair a cracked composite plastic valve cover yourself. All you need are some basic tools and materials, such as epoxy putty, masking tape, and sandpaper. Follow the steps outlined in this article to repair your cracked composite plastic valve cover.