SPETUNER CCV PCV REROUTE DELETE KIT Installation for 6.6L Duramax

The factory crankcase ventilation system on a 2004–2010 6.6L Duramax routes crankcase gases and suspended oil vapor back toward the intake. Over time, this oil mist can coat intake components and contribute to oily residue inside the charge-air path.

A CCV/PCV reroute changes where those vapors travel. This guide explains how to install the SPETUNER kit on compatible LLY, LBZ, and LMM Duramax trucks, including the correct hose-routing path and the checks you should complete before driving.

Important: Allow the engine to cool completely before beginning. Crankcase ventilation modifications may be restricted by emissions or inspection rules in your area. This product is intended for lawful off-road, competition, or exempt applications where permitted. Check the regulations that apply to your vehicle before installation.

Duramax CCV Reroute Kit Fitment

The 2004–2010 6.6L Duramax CCV PCV Reroute Kit is designed for compatible Chevrolet Silverado HD and GMC Sierra HD trucks equipped with an LLY, LBZ, or LMM engine.

[[product-recommend:1]]

Model year alone is not enough to confirm fitment. Verify the engine code and compare the fittings, hose connections, and valve-cover layout on your truck with the product photos before installation. Transition-year trucks and previously modified vehicles may have a different configuration. If your truck is outside the 2004–2010 LLY, LBZ, or LMM range, compare the available Duramax CCV reroute kits by engine generation before choosing a kit.

What Does a Duramax CCV Reroute Kit Do?

The crankcase ventilation system allows pressure and blow-by gases to leave the crankcase. In the factory arrangement, those gases and suspended oil vapor can be routed back into the intake.

A reroute kit redirects that vapor away from the original intake connection. Its main purpose is to reduce the amount of crankcase oil mist that re-enters and coats the intake path.

Helps Keep the Intake Path Cleaner

Separating the crankcase outlet from the original intake connection can reduce oily residue inside the intake tract. It does not clean buildup that is already present, so heavily contaminated components may still require inspection and cleaning.

Provides a More Serviceable Hose Layout

Properly routed hoses make it easier to inspect the crankcase outlets and check for pinching, abrasion, leaks, or frozen moisture. The routing must remain open and unrestricted so crankcase pressure can vent correctly.

What the Kit Does Not Guarantee

A CCV reroute by itself should not be treated as a guaranteed horsepower, fuel-economy, oil-consumption, or emissions upgrade. Results depend on engine condition, blow-by, existing leaks, maintenance history, installation quality, and how the truck is used.

If your goal extends beyond managing crankcase vapor, explore vehicle-specific Duramax performance upgrades for compatible intake, cooling, exhaust, and airflow components. Confirm the engine generation, model year, product fitment, and applicable use requirements before ordering.

Tools and Supplies Required

• 6 mm socket or wrench
• Ratchet and suitable extensions
• Pliers
• Scissors or hose cutters
• Supplied hose clamps and zip ties
• Gloves and safety glasses
• Clean shop towels
• Flashlight

Review the supplied components before disassembling the truck. Confirm that the billet fittings, hoses, cap, adapter, clamps, and zip ties are present and undamaged.

You can also open the SPETUNER iSPETUNER 2004–2010 Duramax CCV PCV reroute kit installation PDF PDF for the original product diagrams.

Pre-Installation Safety Checklist

1. Park safely: Place the truck on a level surface, set the parking brake, and allow the engine to cool.
2. Wear protection: Use safety glasses and gloves when working around hoses, clamps, and the engine bay.
3. Disconnect the batteries: Disconnect the negative battery terminals if required by your service procedure.
4. Inspect the kit: Check every fitting, hose, cap, clamp, and seal before beginning.
5. Plan the hose path: Identify a route away from the exhaust, steering components, suspension travel, sharp edges, and moving parts.
6. Check existing problems: Repair excessive crankcase pressure, serious oil leaks, or abnormal blow-by before treating a reroute kit as the solution.

How to Install the Duramax CCV PCV Reroute Kit

Step 1: Remove the Intake Tube and Silencer

Remove the intake tube and silencer as needed to reach the factory crankcase ventilation connections. Note the position of each clamp and connection before removal. Cover exposed openings with a clean towel so dirt or hardware cannot enter the intake.

Step 2: Disconnect the Factory PCV Crossover Tube

Remove the 6 mm bolts securing the PCV crossover tube to the valve covers. Loosen the center hose clamp and carefully remove the crossover assembly.

Keep the original 6 mm bolts in a clean, secure place. They will be reused to install the billet fittings.

Step 3: Install the Billet Valve-Cover Fittings

Position one supplied billet fitting on each valve cover. Check that the sealing surfaces are clean and that the supplied seals sit correctly.

Secure the fittings with the factory 6 mm bolts removed in Step 2. Start the bolts by hand to prevent cross-threading. Tighten them evenly without overtightening the small fasteners.

Step 4: Cap the Original Intake Connection

Install the supplied cap on the original intake-side opening. Secure it with the provided zip tie or clamp according to the kit instructions.

Confirm that the cap is fully seated and cannot contact nearby belts, pulleys, or hot components. Trim only the excess end of the zip tie.

Step 5: Measure and Route the Longer Hose

Plan a path toward the passenger-side wheel well to help move discharged vapor away from the cab. The original instructions call for approximately 5.5 feet of hose, but verify the required length on your truck before cutting.

Leave enough slack for engine movement without allowing the hose to sag onto the exhaust or suspension. Make a clean, square cut so the hose seats properly on the fitting.

Step 6: Install the PCV Adapter

Install the supplied PCV adapter at the specified valve-cover connection. If the valve cover does not have the referenced plastic box, use the included 90-degree adapter to match the hose-routing layout.

Do not force a fitting that does not match the connection. Stop and confirm the engine code, valve-cover layout, and product configuration if the adapter does not seat correctly.

Step 7: Connect the Shorter Hose

Attach the shorter hose to the passenger-side fitting and secure it with the supplied hose clamp. The hose should fully cover the fitting barb before the clamp is tightened.

Run the two hoses parallel where practical and secure them together with zip ties. Do not tighten the zip ties enough to flatten or restrict either hose.

Step 8: Route the Hoses Through the Wheel-Well Area

Guide the hoses along the outboard side of the frame and behind the upper control arm as shown in the supplied instructions.

Move the steering through its normal range and consider suspension travel before finalizing the route. The hoses must not rub against a tire, sharp frame edge, control arm, driveshaft, or hot exhaust component.

Step 9: Secure and Trim the Hoses

Use the supplied zip ties to secure the hoses in the recommended area near the torsion bar. Leave approximately 2 inches of hose below the mounting point, or enough length to keep the outlet clear and accessible.

Make sure both hose outlets remain open. Never kink, plug, collapse, or route the hoses where ice, dirt, or road debris can block them.

Post-Installation Checks

1. Confirm that both billet fittings sit flat and are secure.
2. Check that the original intake connection is fully capped.
3. Verify that every hose is open and free of kinks.
4. Make sure no hose touches the exhaust, tire, steering, belt, pulley, or sharp edge.
5. Confirm that zip ties hold the hoses without crushing them.
6. Reconnect the batteries if they were disconnected.
7. Start the engine and let it idle while checking for leaks or unusual sounds.
8. Take a short test drive and inspect the complete installation again.

Recheck the fittings, clamps, caps, and hose routing after the first few heat cycles. Continue inspecting the hoses during routine oil changes, especially if the truck operates in cold, muddy, dusty, or off-road conditions.

Common Installation Mistakes to Avoid

• Ordering by year without checking the engine code: LLY, LBZ, and LMM configurations are not identical to every other Duramax generation.
• Cutting the hose too early: Test the full route before trimming the supplied hose.
• Routing too close to the exhaust: Heat can soften or damage the hose.
• Overtightening small bolts: This can damage threads or distort a fitting.
• Crushing the hoses with zip ties: Restricted hoses can increase crankcase pressure.
• Leaving the intake connection open: An unsealed intake port can allow unmetered or contaminated air to enter.
• Ignoring excessive blow-by: Heavy vapor, strong pressure, or rapid oil discharge may indicate an engine-condition problem that requires diagnosis.

Final Thoughts

A correct CCV reroute installation depends more on fitment, sealing, and hose routing than speed. Verify that the truck has an LLY, LBZ, or LMM engine, install the fittings without damaging the seals or threads, and keep both hoses open and safely away from heat and moving parts.

After installation, inspect the system regularly for loose fittings, cracked hoses, rubbing damage, moisture buildup, or signs of abnormal crankcase pressure. A reroute can help limit the amount of oil mist sent back into the intake, but it cannot correct worn engine components or excessive blow-by.

FAQ

Q1: How long does a Duramax CCV reroute installation take?

A1: Most owners should allow approximately 1–2 hours. Installation time depends on experience, the truck's existing modifications, access to the fittings, and whether any factory hoses or clamps are difficult to remove.

Q2: Does a 2004–2010 Duramax CCV reroute require tuning?

A2: This mechanical CCV/PCV reroute kit does not normally require custom tuning or ECU programming. However, confirm the instructions for your exact product and vehicle configuration before installation.

Q3: Will the kit fit every 2004–2010 Duramax?

A3: It is designed for compatible LLY, LBZ, and LMM 6.6L Duramax applications. Verify the engine code and compare the valve-cover connections and product photos before ordering, especially on transition-year or modified trucks.

Q4: Will a CCV reroute increase horsepower?

A4: Do not expect a large or guaranteed horsepower increase from a CCV reroute alone. Its primary function is to redirect crankcase vapor and reduce the amount of suspended oil mist returning to the intake path.

Q5: Can a CCV reroute stop oil consumption?

A5: It may reduce oil mist being carried into the intake, but it will not repair worn piston rings, turbocharger seal problems, external leaks, or other mechanical causes of excessive oil consumption.

Q6: Why should the hoses remain unrestricted?

A6: The crankcase must be able to vent pressure. A kinked, frozen, plugged, or crushed hose can cause crankcase pressure to rise and may contribute to oil leaks or seal problems.

Q7: Why can I smell crankcase vapor after installation?

A7: An open reroute releases crankcase vapor outside the original closed intake path. Outlet location, wind direction, engine condition, and blow-by can affect odor. Route the outlets as instructed and away from the cab, exhaust, and hot components.

Q8: Can a CCV reroute affect my warranty or emissions inspection?

A8: It may affect warranty coverage or emissions compliance depending on the vehicle, location, and applicable rules. Check with the relevant dealer and local authority before modifying the factory crankcase ventilation system.

Lars

Diesel Performance Engineer | 15+ Years Experience

Lars has spent over 15 years working with diesel performance platforms, including Powerstroke, Cummins, and Duramax engines. His work focuses on engine durability, airflow efficiency, thermal control, and practical upgrade guidance for truck owners who tow, work, and build for off-road performance.

"Empower Your Beast: Run Cooler, Pull Harder, Last Longer."