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A restricted CCV filter or oil separator can raise crankcase pressure and contribute to oil leaks, oil use, and excess oil in the intake. However, the CCV design and service schedule vary by truck. Identify the installed assembly before ordering parts.
For a street-driven truck, repairing the factory system is usually the most practical option. A reroute can reduce oil vapor in the intake, but it also brings maintenance, odor, and emissions concerns.
What Does the 6.7 Powerstroke CCV System Do?
Some combustion gas passes around the piston rings and enters the crankcase while the engine runs. This gas, called blow-by, contains moisture and oil mist.
The CCV system releases this pressure through a controlled path. Its oil separator collects part of the oil and sends the remaining gas to the turbo inlet, where it returns to the engine. This controls crankcase pressure and keeps the gas from venting directly into the air.
Does Every 6.7 Powerstroke Have a Replaceable CCV Filter?
No. Ford used different CCV assemblies across 6.7 Powerstroke models, and some trucks have already received updated parts. Parts listings also use “CCV filter” and “oil separator” for several different assemblies.
Check the VIN, model year, truck type, build date, and installed part number before buying a replacement.
Serviceable CCV filter assemblies
Some Ford maintenance schedules list the CCV filter assembly as a replacement item. For example, the 2016 Ford Super Duty Diesel Supplement calls for changing the crankcase ventilation filter assembly at 100,000 miles.
In this case, “changing the filter” can mean replacing the complete assembly rather than opening it and installing a loose filter.
Non-serviceable oil separators
Some updated separators do not have a replaceable internal filter. The complete separator is replaced only when it is restricted, damaged, or fails the correct test.
Ford TSB 19-2142 covers certain 2016–2019 F-650/F-750 trucks and 2017–2019 Super Duty chassis cab and dual-rear-wheel trucks. Ford linked restricted filter elements to high crankcase pressure and oil use during extended idling. The updated replacement separator no longer included a serviceable filter element. Read Ford TSB 19-2142.
What Are the Signs of a CCV System Problem?
These symptoms can point to a CCV restriction, but they can also come from worn engine parts, turbo problems, damaged hoses, or too much engine oil.
New or worsening oil leaks
Restricted CCV flow can raise crankcase pressure and push oil past weak seals. Replacing the CCV assembly can correct the pressure problem, but it cannot repair a seal or gasket that is already damaged.
Increased oil consumption
A worn or restricted separator can allow more oil mist to enter the intake and burn in the engine. Check for external leaks and turbo problems before blaming the CCV system.
Excess oil in the intake system
A light oil coating inside the turbo inlet or charge pipes is common with a closed CCV system. Pooled or dripping oil needs further inspection. Possible causes include a damaged separator, excessive engine wear, an overfilled crankcase, or leaking turbo seals.
High crankcase pressure
High pressure can contribute to oil leaks and poor oil separation. Vapor at the oil-fill opening does not confirm a restriction because diesel engines produce some visible blow-by. Test the pressure and compare the result with Ford’s specification for the truck.
Check engine light and CCV codes
A disconnected hose, loose connector, damaged sensor, or CCV fault can trigger codes such as P04DB, P04E2, and P04E3.
Ford’s 17M04 service instructions tell technicians to check the CCV connection and updated collar when these codes appear. The assembly does not always need replacement. See Ford’s 17M04 service information.
When Should You Replace the CCV Filter or Separator?
Use the Ford maintenance schedule for your VIN rather than a universal mileage claim. The 2016 Super Duty diesel schedule, for example, lists replacement at 100,000 miles.
Replace the applicable filter or separator when:
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The truck reaches the interval in its Ford maintenance schedule
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A pressure test confirms restricted CCV flow
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The housing, hose, or seals are damaged
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Oil use is traced to poor oil separation
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CCV codes return after the connections and sensor are checked
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A Ford service procedure calls for replacement
The 67,500-mile interval found in some aftermarket articles is not a universal Ford specification.
How to Replace the CCV Filter or Separator
The exact access points and fastener settings vary by model. Use the Ford workshop instructions for the VIN and avoid opening high-pressure fuel lines unless the official procedure requires it.
Find the correct replacement part
Record the VIN, model year, truck model, build date, and current part number. Also confirm whether the truck is a pickup or chassis cab and whether it has single or dual rear wheels.
Compare the new and old assemblies before installation. The housing, hose connection, electrical connector, seals, and mounting points should match.
Prepare the truck and tools
Park on level ground, shut off the engine, and let it cool. Clean dirt from the area around the separator so debris cannot enter the valve-cover openings.
Gather the sockets, extensions, torque wrench, clean towels, seals, and scan tool required by the service procedure. Remove only the parts needed for access.
Remove the old assembly
Disconnect the electrical connector without pulling on its wires. Release the outlet hose carefully because aged plastic clips can break.
Remove the mounting fasteners and lift the separator away from the valve cover. Keep dirt, broken plastic, and old seal material out of the engine openings.
Install and check the new assembly
Clean the sealing surfaces and install new seals in the correct positions. Mount the new assembly and tighten each fastener to Ford’s specification.
Reconnect the hose and electrical connector, then reinstall the removed access parts. Start the engine and check for leaks. Scan for returning codes and test crankcase pressure again if it was high before replacement. Monitor the oil level over the next several drives.
What CCV Reroute Options Are Available?
A reroute changes where crankcase gases travel. It does not reduce engine blow-by or repair damaged seals.
Closed-loop catch can reroute
A closed-loop system sends the gases through a catch can and then back to the intake. The can collects additional oil and moisture before the gas reaches the turbo inlet.
This design can reduce intake residue without releasing the gas below the truck. However, the can must be drained and checked for restriction. It also needs protection from freezing in cold climates.
Open atmospheric reroute
An open reroute releases crankcase gases below the truck or through a vented catch can. It can reduce oil mist in the intake, but it does not provide a dependable horsepower or fuel economy gain.
The hose must have enough flow and a clear path. A small, kinked, or blocked hose can raise crankcase pressure.
Owners preparing a dedicated off-road or competition-use 2011–2016 truck can review this 2011–2016 Ford 6.7L Powerstroke CCV reroute kit. Confirm the vehicle fitment and kit configuration before ordering.
What Problems Can a CCV Reroute Cause?
Oil smell and visible vapor
An open reroute releases oil vapor and combustion gas under the truck. The odor can enter the cab at idle, especially when the outlet ends near the driver’s door. Visible vapor is also more noticeable in cold weather.
Oil drips and residue
Oil mist from an open hose can coat the frame and nearby parts. A catch can reduces this residue but can leak or restrict flow if it is not drained.
Restricted or blocked hoses
Sharp bends, crushed sections, and low points can block the hose. Oil or water can collect in low sections and reduce flow, causing crankcase pressure to rise.
Cold-weather condensation
Moisture can collect inside the hose or catch can and freeze. Ice can block the ventilation path, so these systems need more frequent checks during winter.
Check engine lights
A warning light can appear when the CCV sensor is disconnected or the factory connection is left open. Do not disable CCV fault monitoring to hide a problem.
Is a CCV Reroute Legal for Street Use?
An open atmospheric reroute that bypasses the factory closed CCV system should not be used on a public-road vehicle in the United States.
EPA enforcement documents identify crankcase ventilation delete hardware as defeat-device hardware when it bypasses required emissions equipment. See the EPA enforcement order.
A closed-loop catch can is not automatically approved for street use. It must retain required monitoring and meet the emissions rules that apply in the owner’s state. Open reroutes should be limited to dedicated off-road or competition vehicles where the modification is permitted.
Final Thoughts
Confirm the CCV problem before replacing parts. Check the installed assembly, Ford service schedule, hose, connector, fault codes, and crankcase pressure.
For most street-driven trucks, replacing a restricted factory filter or separator is the simplest choice. A reroute adds maintenance and can create odor, oil residue, cold-weather blockage, warning lights, and emissions problems.
FAQs
Where is the CCV filter on a 6.7 Powerstroke?
The CCV oil separator is mounted on top of the driver-side valve cover, behind the engine-mounted fuel filter. Its outlet hose connects the separator to the intake near the turbo inlet.
Can you clean a 6.7 Powerstroke CCV filter?
Do not wash the filter with solvent or blow it out with compressed air unless Ford provides a cleaning procedure for that exact assembly. Cleaning can damage the filter material or internal valves. Replace the scheduled filter or complete separator instead.
Do you need to change the engine oil during CCV replacement?
CCV replacement does not require an oil change by itself. Check the oil level before and after the repair, and change the oil only when it reaches its normal service interval or shows contamination.
Does a new CCV assembly require a PCM reset?
The mechanical replacement does not require performance tuning. Clear stored codes after completing the repair. If a VIN-specific Ford service program calls for PCM programming, that work should follow Ford’s procedure.
Recommended Reading ：
The 12 Most Common 6.7 Powerstroke Problems with Solutions
Ultimate Guide: 6.7 Powerstroke Oil Capacity & Maintenance Tips
