Quick Answer: How Do You Install an LML Duramax CCV Reroute Kit?
Install the billet delete plate, remove the factory PCV hose, seal the old turbo-intake connection, connect the new hose, and route it toward the driver-side frame rail. You will need 10 mm and 12 mm sockets, a U-joint socket, an extension, pliers, O-ring-safe lubricant, and zip ties. Confirm that your truck has the 2011–2016 6.6L LML Duramax layout before starting. Keep the new hose open and away from heat, sharp edges, and moving parts.
Before You Start the LML CCV Reroute Installation
The factory crankcase ventilation system sends oil vapor and blow-by gases back into the intake. An LML CCV reroute changes this path so the vapor no longer enters the turbo-intake tract through the original hose connection.
This modification may help limit new oil mist inside the intake. It does not repair worn piston rings, a damaged turbo seal, heavy blow-by, active oil leaks, or high crankcase pressure. Diagnose those problems before changing the ventilation layout.
This guide applies to supported 2011–2016 Chevrolet Silverado and GMC Sierra trucks equipped with the 6.6L LML Duramax. Model year alone is not enough to confirm fitment. Check the engine code, existing hose layout, and any earlier modifications before ordering parts.
| Fitment Check | What to Confirm |
|---|---|
| Model year | 2011–2016 |
| Engine | 6.6L LML Duramax diesel |
| Truck | Supported Chevrolet Silverado or GMC Sierra application |
| Factory layout | The PCV hose and turbo-intake connection match the instructions and supplied hardware |
| Previous changes | No installed part blocks the plates, bolts, clamps, or planned hose route |
If you also need other engine-specific parts, the 2011–2016 LML 6.6L Duramax collection groups compatible options by platform. Always verify the fitment stated on the individual product page.
What an LML Duramax CCV Reroute Does
The factory PCV hose carries crankcase vapor from the valve-cover area to the turbo intake. The reroute kit removes this original intake connection, seals the unused opening, and directs the crankcase hose away from the intake tract.
This can reduce the amount of new oil mist entering the intake. It does not guarantee more horsepower, longer engine life, better fuel economy, or a fix for an existing mechanical problem.
If you are comparing kits for more than one Duramax generation, the Duramax CCV and PCV reroute kit collection helps separate the available options by engine and model-year range.
Tools and Parts Required
Required Tools
- 10 mm and 12 mm socket wrenches
- U-joint socket for the harder-to-reach lower bolt
- Long extension bar
- Long-nose or angled pliers for the hose clamps
- O-ring-safe lubricant
- Zip ties for securing the rerouted hose
- Gloves and eye protection
- Rated jack stands or a hoist if access below the truck is required
Verify the Kit Components
Before removing the factory hose, inspect the SPETUNER 2011–2016 LML Duramax CCV/PCV reroute kit. Based on the supplied installation article, the kit includes:
- Billet aluminum delete plate
- PCV reroute hose
- Spring clamps
- Block-off plate
Compare the received parts with the current product listing and bill of materials. Stop before installation if a required plate, O-ring, hose, clamp, or fastener is missing or damaged.
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Pre-Installation Safety Checklist
- Park the truck on a stable, level surface.
- Set the parking brake.
- Allow the engine, turbo, and exhaust parts to cool fully.
- Wear gloves and eye protection.
- Keep loose clothing and tools away from the belt and fan.
- Use a rated hoist or jack stands at approved lift points if lower access is needed.
- Never work under a truck supported only by a floor jack.
- Review the complete hose path before removing or securing any part.
How to Install an LML Duramax CCV Reroute Kit
Step 1: Inspect and Lubricate the Delete Plate O-Ring
- Inspect the O-ring for cuts, twists, flat spots, or other damage.
- Apply a small amount of O-ring-safe lubricant to its inner edge.
- Make sure the O-ring remains seated in its groove.
The lubricant helps the seal slide into place without catching or tearing. Do not install a damaged O-ring.
Step 2: Install the Billet Delete Plate
- Align the billet delete plate with the factory PCV port.
- Push it into place with light, even pressure.
- Watch the O-ring while the plate seats. It must not pinch or roll out of its groove.
- Start the mounting bolts by hand.
- Tighten the bolts evenly without forcing the plate.
Do not overtighten the fasteners. The O-ring creates the seal. Too much force may damage the seal, plate, or threads. Use the current product instructions or factory service information if a torque value is provided.
Step 3: Disconnect the Factory PCV Hose
- Locate the factory PCV hose connection below the turbo boost tube on the valve cover.
- Use long-nose pliers to remove the crimped clamp carefully.
- Pull the hose end from the fitting with steady pressure.
Do not pry against a plastic, cast, or sealing surface. If the hose is stuck, work it loose slowly to avoid damaging the fitting.
Step 4: Remove the PCV Hose from the Turbo Intake
- Follow the factory hose to its mounting point at the turbo intake near the resonator delete plate.
- Loosen the upper mounting bolt. Remove it by hand after it is free if access allows.
- Use a U-joint socket and long extension to reach the lower bolt.
- Keep the socket square on the fastener and work slowly to avoid stripping it.
- Lift the factory PCV hose assembly out of the engine bay after removing both bolts.
A light oil film inside the factory hose can be normal because the system carries crankcase vapor. Pooled liquid oil, fast oil loss, or strong crankcase pressure needs further diagnosis. A reroute kit should not be used to hide an engine or turbo problem.
Step 5: Install the Block-Off Plate
- Clean the original PCV hose mounting area without allowing debris to enter the intake.
- Align the SPETUNER block-off plate with the original mounting location.
- Make sure the plate sits flat against the sealing surface.
- Start the upper factory bolt by hand, followed by the lower bolt.
- Tighten both fasteners evenly.
- Return the nearby wire-harness bracket to its correct position while securing the lower bolt.
Confirm that the plate sits flat and the wire harness is not loose, stretched, pinched, or trapped below the plate.
Step 6: Connect the New CCV Hose
- Slide a spring clamp over the new hose and leave it a few inches back from the end.
- Push the hose fully onto the barbed PCV fitting on the valve cover.
- Use long-nose angled pliers to move the spring clamp over the connection.
- Confirm that the clamp sits behind the fitting barb and holds the hose evenly.
The hose should cover the fitting fully. It must not be split, folded, or held only by the edge of the clamp.
Step 7: Route the CCV Hose
- Route the hose upward, then over and down toward the driver-side frame rail.
- Keep it away from the turbo, exhaust, belt, fan, steering parts, and other moving components.
- Use wide bends so the hose does not kink or collapse.
- Leave enough slack for normal engine movement without allowing the hose to rub.
Test the entire route before securing the hose. A clean-looking route is not safe if it touches a heat source, sharp edge, or moving part.
Step 8: Secure the Hose Along the Frame Rail
- Raise and support the truck with approved equipment if lower access is required.
- Continue the hose toward the outside of the frame rail.
- Use the supplied zip ties to support it at several points.
- Trim only the excess ends of the zip ties.
- Check the complete route for heat, pinch points, sharp edges, and moving parts.
Do not tighten a zip tie enough to crush or flatten the hose. The crankcase must retain an open ventilation path.
Optional Catch Can Considerations
The supplied article lists a vented catch can as an optional addition. A correctly sized and installed catch can may collect part of the oil mist carried through the rerouted hose. It also adds a component that needs secure mounting, correct routing, draining, and regular inspection.
Confirm that the catch can supports the truck’s crankcase flow and planned venting layout. A restrictive, full, frozen, or poorly routed catch can may increase crankcase pressure. Never cap the outlet or reduce the hose path without verified instructions.
Post-Installation Checks
Before Starting the Engine
- Confirm that the billet plate is seated and its O-ring is not visible or pinched.
- Make sure the block-off plate sits flat.
- Check that all bolts were started correctly and tightened evenly.
- Verify that the spring clamp sits behind the hose barb.
- Make sure the hose has no kink, flat spot, tight bend, or blocked end.
- Confirm that the wire-harness bracket is back in place.
- Remove all loose tools and fasteners from the engine bay.
Idle Check
- Start the truck and let it idle for several minutes.
- Listen for a new hiss or unusual crankcase noise.
- Inspect both plates and the hose connection for seepage or movement.
- Shut the engine off if the hose collapses, comes loose, or shows unusual pressure.
Short Test Drive and Recheck
Take a short test drive only after the idle inspection passes. Park the truck, shut off the engine, and inspect the route again. Heat and engine movement may reveal a rub point that was not clear while the truck was cold.
Check the engine oil level during the post-install inspection. SPETUNER’s 6.6L Duramax oil capacity and oil type guide covers the LML and other Duramax generations. Use the dipstick and the truck’s service information to confirm the final level.
Common LML CCV Reroute Installation Mistakes
| Mistake | Possible Result | What to Check |
|---|---|---|
| Pinching the plate O-ring | Oil seepage or a poor seal | Remove the plate and inspect the O-ring before reinstalling it |
| Overtightening the plate bolts | Damaged threads, plate, or seal | Follow the current product or service instructions instead of guessing a torque value |
| Routing the hose near the turbo or exhaust | Heat damage or a softened hose | Move the hose to a cooler path and secure it away from hot parts |
| Creating a tight bend | Restricted crankcase ventilation | Use wide bends and confirm that the hose remains open |
| Crushing the hose with zip ties | Reduced hose flow | Loosen or replace the tie and restore the hose shape |
| Ignoring heavy blow-by or liquid oil | An engine or turbo problem remains undiagnosed | Diagnose the crankcase and engine before treating the reroute as a repair |
| Ordering by year alone | Wrong kit or mismatched hardware | Confirm the LML engine code, factory layout, truck configuration, and product fitment |
CCV Reroute Kit vs. a Complete LML Modification Package
A CCV reroute is a focused crankcase-ventilation change. It does not remove the EGR, DPF, or DEF systems and should not be treated as a substitute for a complete emissions-related package.
For a stand-alone CCV project, use the dedicated reroute kit. Owners planning a lawful off-road or closed-course build with several matched changes can separately review the 2011–2016 LML Duramax all-in-one EGR, DPF, and DEF kit. It serves a different purpose and may involve additional hardware, electronic requirements, installation work, and legal restrictions.
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If you are deciding whether to complete one change at a time, the guide to all-in-one diesel kits versus separate parts explains the main differences in fitment planning, cost, and installation scope.
Legal-use notice: Rules for crankcase-ventilation changes and emissions-related hardware vary by location and vehicle use. Products that remove or alter regulated emissions equipment may be restricted to off-road, competition, or export use. They may also affect inspections and warranty coverage. Check the laws that apply to your vehicle before ordering or installing any part.
Final Inspection and Maintenance
A correct installation leaves both plates sealed and the hose open. The full route should remain clear of heat, moving parts, sharp edges, and pinch points. Recheck the clamp, zip ties, hose bends, and plate areas after the first heat cycle and during normal service.
Do not ignore a new oil leak, unusual odor, collapsed hose, rising crankcase pressure, heavy discharge, or rapid oil use. Stop and diagnose the cause. A CCV reroute changes the vapor path, but it cannot repair internal engine wear or a damaged turbo seal.
Find the Right CCV Reroute Parts for Your Duramax
Shop the LML collection for parts built around the 2011–2016 engine platform. Use the Duramax CCV collection to compare crankcase-ventilation kits across different Duramax generations. Confirm the model year, engine code, factory layout, and product-page fitment before ordering.
FAQ
Q1: What years does this LML Duramax CCV reroute guide cover?
A1: This guide covers supported 2011–2016 Chevrolet Silverado and GMC Sierra trucks with the 6.6L LML Duramax. Confirm the engine code and product fitment before ordering.
Q2: What tools do I need to install an LML CCV reroute kit?
A2: You need 10 mm and 12 mm sockets, a U-joint socket, a long extension, angled pliers, O-ring-safe lubricant, and zip ties. Safe lifting equipment may also be required.
Q3: Does an LML Duramax CCV reroute require tuning?
A3: The supplied stand-alone CCV installation procedure does not list tuning as one of its mechanical steps. Confirm the requirements for your exact kit and any other changes made at the same time.
Q4: Will an LML CCV reroute cause a check engine light?
A4: A check engine light is not expected based only on this mechanical hose procedure, but no result should be guaranteed. Scan any new code and inspect every disturbed hose, connector, bracket, and seal.
Q5: Where should the LML CCV reroute hose be routed?
A5: Route it toward the driver-side frame rail and then toward the outside of the rail. Keep it away from the turbo, exhaust, belt, fan, steering parts, and sharp edges.
Q6: Is oil inside the factory LML PCV hose normal?
A6: A light oil film can occur because the hose carries crankcase vapor. Pooled oil, rapid oil loss, heavy discharge, or strong pressure needs further diagnosis.
Q7: Can I add a catch can to an LML CCV reroute?
A7: A properly sized vented catch can may be added if it supports the required crankcase flow. It must be mounted, routed, drained, and inspected correctly.
Q8: How do I check an LML CCV reroute after installation?
A8: Confirm that both plates are sealed, the clamp is behind the hose barb, and the hose remains open. Recheck for leaks, heat contact, rubbing, loose parts, and hose movement after idling and a short drive.
Lars
Diesel Performance Engineer | 15+ Years Experience
"Empower Your Beast: Run Cooler, Pull Harder, Last Longer."
