Updated on January 6, 2026 by John Lee
TL;DR
Cleaning and painting the 6.7 Cummins valve cover protects the aluminum and enhances appearance. Remove the valve cover safely, degrease it, sand with 180–600 grit sandpaper, and wipe with a solvent to ensure a smooth, clean surface. Billet and cast aluminum require slightly different sanding approaches. Optional advanced methods include propane torch, brake/purple cleaner combo, or professional steam cleaning. For a hassle-free option, SPELAB custom valve covers come pre-treated for excellent paint adhesion and offer color customization.
Painting the valve cover on your 6.7 Cummins engine is a rewarding way to personalize your truck while protecting its aluminum surfaces. A well-prepared and clean valve cover not only looks great but also ensures that paint adheres properly and lasts longer. Whether you enjoy hands-on DIY work or prefer a professional-ready option, this guide will walk you through every step—from safely removing the valve cover and cleaning it thoroughly to advanced techniques and optional custom solutions—to achieve a flawless, long-lasting finish.
1. Why Cleaning the 6.7 Cummins Valve Cover Matters
The cleanliness of the valve cover directly affects paint adhesion. Engine oil, dust, and high temperatures can leave residues and oxidation that prevent paint from adhering properly. If not cleaned thoroughly, paint can peel, discolor, or appear uneven. Proper cleaning ensures a long-lasting and aesthetically pleasing paint finish.
2. DIY Cleaning Steps for 6.7 Cummins Valve Cover (Including Removal)
Before painting, it is recommended to remove the valve cover. This allows complete access to all surfaces and prevents contamination from the engine interior.
2.0 Valve Cover Removal
Safety first: Wear gloves and safety glasses. Work in a well-ventilated area and keep a fire extinguisher nearby if using flammable solvents.
Step 1: Disconnect the battery – Always disconnect the negative terminal to prevent short circuits.
Step 2: Clear the workspace – Cover nearby hoses, cables, and components to prevent debris from falling into the engine.
Step 3: Locate and loosen bolts – The 6.7 Cummins valve cover has approximately 10–12 bolts. Loosen bolts in a crisscross (diagonal) sequence to avoid warping the aluminum.
Step 4: Gently pry the valve cover – Use a plastic pry tool. Avoid metal tools that could scratch or damage the aluminum surface. If it resists, double-check that all bolts are fully loosened.
Step 5: Remove the old gasket – Carefully lift off the old gasket. Inspect for cracks or hardened sealant. Clean the groove with a soft brush or scraper, taking care not to gouge the aluminum.
Step 6: Organize bolts and parts – Place all bolts, washers, and brackets in a labeled tray to avoid confusion during reinstallation.
Step 7: Optional: Check valve cover surface – Inspect for cracks, corrosion, or severe oxidation. Repair or replace if necessary before painting.
2.1 Degreasing
Apply a high-efficiency automotive degreaser to remove oil, dirt, and old paint from the valve cover. Use a brush for hard-to-reach areas. Proper degreasing is crucial for paint adhesion. Let it sit for a few minutes, then rinse with water or wipe with a clean cloth.
2.2 Sanding the Valve Cover Surface
Use 400–600 grit aluminum oxide sandpaper to remove oxidation and smooth the surface. For heavily oxidized areas, start with 180 grit sandpaper and finish with finer grit. Avoid steel wool to prevent scratches. Sand evenly across the entire surface, including corners and edges.
2.3 Solvent Wipe Down
Wipe the valve cover thoroughly with a solvent such as acetone, brake cleaner, or purple cleaner. This removes sanding dust, oil residues, and prepares the surface for painting. Use lint-free cloths to avoid fibers sticking to the surface.
Once cleaned, the 6.7 Cummins valve cover is ready for painting.
Upgrade your 6.7 Cummins Valve Cover2.4 DIY Pre-Paint Checklist
- All bolts removed and organized
- Valve cover free of oil, grease, dust, and old paint
- Sanded smooth and wiped with solvent
- Gasket groove cleaned
- Workspace cleared and ventilated
- Safety gear ready: gloves, glasses, mask
- Optional: surface inspected for cracks or corrosion
3. Cleaning Methods for Different Types of 6.7 Cummins Valve Covers
The material and manufacturing process affect cleaning. Aluminum valve covers are commonly billet or cast, each requiring slightly different approaches.
Billet Aluminum Valve Cover
Billet aluminum surfaces are often rough and may have oxidation layers or impurities. Steps:
- Degrease with an automotive degreaser.
- Sand coarse areas with 180 grit, then smooth with 400–600 grit sandpaper.
- Wipe thoroughly with a solvent.
Cast Aluminum Valve Cover
Cast aluminum may have burrs or rough surfaces. Steps:
- Use a degreaser designed for cast aluminum.
- Sand rough surfaces with coarse sandpaper, then finish smooth with fine sandpaper.
- Wipe with solvent to remove all residues.
4. Innovative Cleaning Methods
Propane Torch Cleaning
A propane torch can burn off oil and grime on aluminum surfaces. Move the flame carefully, keeping distance to avoid warping. This brightens the surface without damaging the aluminum. Use in a ventilated area, keep flammable materials away, and wear gloves and eye protection.
Brake Cleaner and Purple Cleaner Combo
Combining brake cleaner with purple cleaner can remove stubborn oil stains more efficiently. Brake cleaner dissolves heavy oils, while purple cleaner removes remaining residues. Apply with a cloth or brush, working in sections. Ventilation and gloves are required.
Steam Cleaning and Sandblasting
Professional shops can use steam cleaning and sandblasting for the most thorough results. This ensures all residues, oxidation, and impurities are removed, giving a perfect surface for painting.
5. Choose SPELAB Custom 6.7 Cummins Valve Covers
SPELAB custom valve covers are pre-treated for optimal paint adhesion. Choosing a SPELAB valve cover reduces cleaning time and ensures a smooth, professional finish.
Professional Quality
Fine surface treatment ensures longer-lasting paint adhesion and smooth finish.
Convenience
No need for tedious DIY cleaning; the cover is ready to paint.
Paint Colors and Customization
SPELAB offers multiple paint color options and personalized customization services.
6. Conclusion
Proper cleaning is critical whether performing DIY or using a custom valve cover. Thorough cleaning, including removal, degreasing, sanding, and solvent wipe, ensures paint adheres well and lasts longer. Following the pre-paint checklist avoids common mistakes. SPELAB covers provide a professional, convenient alternative with minimal preparation. Follow these steps to achieve a long-lasting, aesthetically pleasing finish.
7. FAQ
Q1: How do I clean oil stains from the 6.7 Cummins valve cover?
A1: Use a degreaser to remove oil, sand lightly with 400–600 grit sandpaper, then wipe thoroughly with a solvent like acetone or brake cleaner.
Q2: What sandpaper grit should I use?
A2: Start with 180 grit for oxidation, then finish with 400–600 grit aluminum oxide sandpaper for a smooth surface.
Q3: How do I remove the oxidation layer?
A3: Sand gently with fine sandpaper (400–600 grit) or use a specialized aluminum cleaner before sanding.
Q4: Do I need to remove the valve cover?
A4: Yes. Removal allows thorough cleaning inside and out, and avoids contamination from the engine.
Q5: What solvents are recommended?
A5: Acetone, brake cleaner, or purple cleaner to remove dust and remaining oil.
Q6: What tools are required for removal?
A6: Socket or ratchet set, torque wrench, plastic pry tool, and a tray for bolts.
Q7: Can I clean the cover without removing it?
A7: Minor surface cleaning is possible, but thorough cleaning and sanding require removal.
Q8: How to avoid damaging the valve cover during removal?
A8: Loosen bolts diagonally, use a plastic pry tool, and handle gently to avoid warping or scratches.
John Lee
Mechanical Engineer | 10+ Years Experience
John has spent the last decade engineering and testing high-performance automotive components. Specializing in drivetrain durability and thermal management across Powerstroke, Cummins, and Duramax applications, he bridges the gap between OEM limitations and aftermarket performance. His philosophy: "Factory parts are just a starting point."
