If you own a truck powered by a 6.7 Cummins engine, you’ve likely wondered about your valve cover—whether it’s routine maintenance, an upgrade, or a repair prompting your curiosity. Knowing how to handle the valve cover is essential, since it protects vital engine components and can impact performance.
In this article, we’ll walk you through everything you need to know about the 6.7 Cummins valve cover, including step-by-step instructions, helpful tips, and important insights for a successful project.
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Understanding the 6.7 Cummins Valve Cover
The valve cover is a critical engine component, especially for those driving or maintaining vehicles with the powerful 6.7L Cummins diesel engine. It not only seals the top of your engine but also protects vital internal parts, ensures proper ventilation, and enhances durability. Whether you’re repairing, upgrading, or just learning more about your engine, understanding the specifics of the 6.7 Cummins valve cover is vital.
What is a Valve Cover?
In simple terms, your valve cover sits on top of your engine’s cylinder head. It acts as a protective shield over the valvetrain (which includes rocker arms and other moving parts), keeping out dirt and debris while containing oil for lubrication. For the 6.7 Cummins, this piece is absolutely essential for ensuring smooth engine function and longevity.
Key Roles of the 6.7 Cummins Valve Cover
- Seals the Cylinder Head: Prevents oil leakage and keeps contaminants out of the engine.
- Houses the CCV (Crankcase Ventilation) System: Proper ventilation is crucial to control pressure and prevent leaks.
- Reduces Noise: Damps noise produced by moving valve train parts.
- Provides Mounting Surface: Some valve covers come with mounting points for ignition components and wiring harnesses.
Types of Valve Covers for the 6.7 Cummins
Valve covers come in various designs and materials based on your engine’s needs and your performance goals.
1. OEM (Original Equipment Manufacturer) Valve Covers
- Material: Most are made from molded plastic or stamped steel.
- Purpose: Designed for standard operation and daily use.
- Features: Often integrated with factory crankcase ventilation systems and wiring harnesses.
2. Aftermarket and Performance Valve Covers
- Material: Frequently made from billet or cast aluminum for enhanced strength.
- Benefits:
- Better heat dissipation
- Stronger sealing properties
- Attractive appearance (often available in custom finishes)
- Common Uses: Popular among enthusiasts looking for upgrades in durability, appearance, or for high-performance applications.
- Special Features: Some models come with dual CCV ports, custom engraving, or improved baffling to handle performance modifications.
Why Upgrade the 6.7 Cummins Valve Cover?
Upgrading the valve cover is often seen among serious truck owners and those pushing their Cummins engines harder than average. Here’s why you might consider an upgrade:
- Enhanced Durability
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Aftermarket billet or cast covers are far less prone to cracking or warping compared to factory plastics.
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Improved Oil Control
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Superior baffling and sealing help keep oil where it belongs, reducing the risk of leaks.
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Better Crankcase Ventilation
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Some covers offer expanded or dual CCV outlets, which are essential for high-boost engines.
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Aesthetics
- An aftermarket valve cover can be a centerpiece under your hood.
Step-by-Step Guide: Replacing or Upgrading Your 6.7 Cummins Valve Cover
Before you begin, ensure you have the necessary tools, a clean workspace, and the correct replacement valve cover (OEM or aftermarket).
Tools & Materials You’ll Need
- Ratchet and socket set
- Torque wrench
- Screwdrivers
- New valve cover gasket (if not included)
- Cleaning cloths
- Gasket scraper (if needed)
The Replacement Process
- Preparation
- Allow your engine to cool completely.
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Disconnect the battery for safety.
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Remove Engine Components
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Take off any obstructing components, such as intake tubes, wiring harnesses, or brackets.
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Disconnect the Valve Cover
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Carefully unplug any sensors, CCV hoses, or wiring connected to the valve cover.
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Remove Valve Cover Bolts
- Use your socket set to remove the bolts in a crisscross pattern to avoid warping the cover.
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Set all hardware aside for reinstallation unless using new bolts supplied with your cover.
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Lift Off the Old Valve Cover
- Break the gasket seal gently and lift the cover away from the engine.
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Inspect for any signs of oil sludge, debris, or gasket breakdown.
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Clean the Mating Surface
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Wipe the cylinder head clean and remove any residue or remaining gasket material.
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Install the New Gasket/Cover
- Place the new gasket on the new cover (or head, if required).
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Position the cover over the head, ensuring a snug, even fit.
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Bolt Down and Reconnect
- Lightly snug the bolts by hand, then torque them to the manufacturer’s specifications in a crisscross pattern.
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Reattach any sensors, hoses, and wiring.
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Reinstall Removed Components
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Return any brackets, lines, or components you removed earlier.
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Final Checks
- Connect the battery and start the engine.
- Inspect for leaks and listen for unusual sounds, tightening bolts as needed.
Benefits of Aftermarket 6.7 Cummins Valve Covers
Switching to an aftermarket valve cover provides several long-term advantages:
- Increased Engine Longevity: Better sealing and ventilation keeps internals cleaner and cooler.
- Less Maintenance: Stronger materials resist warping and oil leaks, reducing troubleshooting.
- Performance Ready: Engineered for higher tolerances if you’re modifying or tuning your engine.
- Visual Upgrade: Attractive designs can set your engine bay apart at shows or meetups.
Potential Challenges and Considerations
No upgrade or repair is without its challenges. Here are aspects to be mindful of:
- Fitment: Some aftermarket covers may require modifications or additional parts (like custom CCV hoses).
- Cost: Billet or specialty covers cost more upfront, but can save on repairs and replacements later.
- Compatibility: Some covers are designed for certain model years or setups; always verify before purchase.
- Warranty Impact: If your truck is under factory warranty, check if aftermarket parts affect coverage.
Practical Maintenance Tips
- Check for Leaks Regularly: Inspect around the valve cover for oil drips, especially after installation or hard use.
- Monitor PCV/CCV System: Ensure proper ventilation to avoid pressure buildup and gasket failures.
- Torque Bolts Properly: Over-tightening can warp the cover, while under-tightening leads to leaks.
- Replace Gasket When Servicing: Always use a new gasket when removing/reinstalling the valve cover.
Cost Considerations
Valve covers range greatly in price. Here’s what you should know:
- OEM Covers: Typically the most affordable option, best for stock vehicles and standard repairs.
- Aftermarket Billet/Aluminum Covers: Premium pricing, but offer substantial benefits in performance and reliability.
- Shipping Costs: Large and heavy aluminum/billet covers can be pricey to ship, especially internationally. Look for bundled shipping, free shipping offers, or buy from local suppliers to reduce costs.
- Bulk or Bundled Purchases: Some suppliers offer discounts for combined purchases with gaskets or installation hardware.
Best Practices When Shopping for a 6.7 Cummins Valve Cover
- Verify Model Year Compatibility
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6.7 Cummins covers can vary by engine year, especially between 2007.5–2012 and 2013–2024 models.
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Consider Future Upgrades
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If you plan to tune or modify your engine for higher power, opt for a performance valve cover now.
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Evaluate CCV Options
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Some covers provide dual or rerouted CCV ports for better crankcase management.
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Check Included Hardware
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Ensure your new cover comes with necessary bolts, gaskets, and adapters to avoid delays.
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Read Customer Reviews and Feedback
- Practical, real-world experiences can help you choose the best cover for performance and reliability.
Frequently Asked Questions (FAQs)
What does the valve cover do on my 6.7 Cummins engine?
The valve cover seals the top of the cylinder head, keeping oil in and contaminants out. It also houses components for crankcase ventilation and can help reduce engine noise.
Can I install a billet valve cover on a stock 6.7 Cummins?
Yes, as long as the cover matches your engine’s year and configuration. Billet covers provide improved durability, better sealing, and a more attractive look compared to stock plastic or steel covers.
Do I always need to replace the valve cover gasket when changing covers?
Absolutely. Replacing the valve cover gasket ensures a proper seal and prevents oil leaks, even if the old gasket looks undamaged.
What are the benefits of upgrading to an aftermarket or billet valve cover?
Upgraded covers are more robust, resist warping, allow for better crankcase ventilation, and often improve the appearance of your engine bay.
How much does a new 6.7 Cummins valve cover cost?
Prices range widely: OEM covers are usually less expensive, while billet or performance covers command a premium. Always account for shipping and whether the cost includes gaskets or hardware.
Conclusion
The valve cover might seem like a small detail on the powerful 6.7 Cummins engine, but its role in protection, performance, and reliability is substantial. Whether you’re replacing a leaky stock cover or seeking better performance and looks, knowing how to choose, install, and maintain your valve cover pays off in the long run. Invest thoughtfully, follow best practices, and your Cummins will thank you for many miles to come.