PC3Z-6A785-A: Ford 6.7L Powerstroke Crankcase Ventilation Tube Guide
The part number PC3Z-6A785-A is the updated genuine Ford OEM crankcase ventilation oil separator tube assembly engineered for modern 6.7L Powerstroke turbo diesel engines in Ford Super Duty trucks. Understanding this part's function, supersession history, failure symptoms, and installation procedure prevents costly oil leaks and turbocharger contamination.
What is Ford Part Number PC3Z-6A785-A?
Part number PC3Z-6A785-A is the factory Motorcraft crankcase ventilation (CCV) breather outlet tube and oil vapor return line. It connects the engine oil separator box located on the driver side valve cover directly to the turbocharger intake air tract on Ford 6.7-liter Powerstroke V8 turbo diesel engines.
Ford introduced this revised part with reinforced fluoropolymer heat-resistant synthetic o-ring seals and an updated quick-connect locking collar to resolve chronic oil seepage issues found on earlier generation factory hoses.
| Part Specification | OEM Factory Details |
|---|---|
| OEM Part Number | PC3Z-6A785-A (Motorcraft) |
| Superseded Part Numbers | FC3Z-6A785-C, FC3Z-6A785-B, HC3Z-6A785-A, LC3Z-6A785-A |
| Engine Fitment | Ford 6.7L Powerstroke V8 Turbo Diesel |
| Compatible Vehicles | Ford F-250, F-350, F-450, F-550 Super Duty (2017–2024+) |
| MSRP Price Range | $45 – $75 USD |
Symptoms of a Damaged or Leaking Crankcase Ventilation Tube
The 6.7L Powerstroke CCV system operates under constant pulsating crankcase pressures and extreme thermal cycling. Over time, plastic locking clips degrade and internal elastomer seals harden:
- Oil Dripping on Driver Side Axle/Pan: Oil mist escapes the quick-connect joint at the valve cover and runs down the back of the engine, often misdiagnosed as an expensive upper oil pan leak.
- Burnt Oil Smell in HVAC Cabin Vents: Oil vapors dripping onto hot exhaust downpipes or exhaust gas recirculation (EGR) coolers vaporize and get drawn into the cabin fresh air intake.
- Loose or Broken Quick-Release Tabs: Brittle plastic locking tangs break during routine fuel filter changes or air intake servicing, causing unmetered air and blow-by mist leakage.
- Turbo Compressor Wheel Residue: Damaged check valves inside the assembly allow excessive heavy oil sludge to coat the turbo inlet wheel.
Supersession History and Engineering Revisions
Ford updated the 6.7L Powerstroke CCV tube multiple times between 2017 and 2024 to address oil blow-by and connector fatigue.
| Part Number Revision | Production Era | Key Engineering Changes |
|---|---|---|
| FC3Z-6A785-C | 2017 – 2019 | Early push-lock connector with standard nitrile o-rings |
| LC3Z-6A785-A | 2020 – 2022 | Reinforced elbow angle with secondary retention clip |
| PC3Z-6A785-A | 2023 – Present | High-temp Viton dual internal seals + reinforced polymer housing |
Vehicle Fitment Compatibility Matrix
Confirming your truck's model year and body configuration ensures proper routing clearance around fuel lines and brake master cylinders.
| Ford Model | Model Years | Engine Option | Direct Fit? |
|---|---|---|---|
| Ford F-250 Super Duty | 2017 – 2024 | 6.7L Powerstroke V8 (Std & High Output) | Yes (100% Plug-and-Play) |
| Ford F-350 Super Duty | 2017 – 2024 | 6.7L Powerstroke V8 Diesel | Yes (100% Plug-and-Play) |
| Ford F-450 / F-550 Chassis Cab | 2017 – 2024 | 6.7L Powerstroke Commercial Diesel | Yes (Direct Fit) |
| Ford F-650 / F-750 Medium Duty | 2018 – 2024 | 6.7L Powerstroke Diesel | Yes (Verify Chassis Routing) |
How to Replace Ford CCV Tube PC3Z-6A785-A in 4 Steps
Step-by-step DIY replacement guide for Ford 6.7L Powerstroke Super Duty owners.
Step 1: Allow Engine to Cool and Disconnect Negative Battery Terminals
Ensure the engine bay is cool to touch and disconnect battery grounds for safety while working near the upper engine harness.
Step 2: Release Quick-Connect Locking Tabs
Squeeze the plastic locking collar on the oil separator outlet and gently pull straight back without twisting to avoid snapping the nipple.
Step 3: Disconnect Lower Hose from Turbo Air Intake Duct
Release the lower spring clamp or squeeze collar connecting the tube to the primary intake inlet pipe and remove the old assembly.
Step 4: Install New PC3Z-6A785-A Tube and Confirm Locking Click
Lubricate the new internal o-rings with clean motor oil, push the new tube firmly onto the oil separator until an audible click is heard, and pull back gently to verify engagement.
Frequently Asked Questions (7 Questions Answered)
Q1: What does the Ford part PC3Z-6A785-A do?
It vents blow-by crankcase oil vapor from the valve cover oil separator back into the turbocharger intake tract, maintaining balanced internal crankcase pressures while preventing atmosphere pollution.
Q2: Can a leaking PC3Z-6A785-A hose cause boost leaks?
No, this tube is part of the pre-turbo intake and crankcase breathing circuit, so it will not cause a pressurized charge-air boost leak, but it can cause unmetered air draw and oil seepage.
Q3: Does PC3Z-6A785-A fit on 2011 to 2016 6.7L Powerstroke trucks?
No, 2011 to 2016 Powerstroke models use an older sealed crankcase ventilation box with different hose routing (part series BC3Z-6A785). PC3Z-6A785-A is designed for 2017+ models.
Q4: Why does oil leak around this CCV connection?
The factory o-ring seals harden from extreme diesel exhaust heat and engine vibration over time, allowing pressurized oil mist to seep past the plastic locking joint.
Q5: Is tools required to replace part PC3Z-6A785-A?
No specialized hand tools are required. The assembly utilizes quick-release push tabs, though a small flat-blade screwdriver can assist in depressing stubborn locking clips.
Q6: Can I clean the old hose instead of buying PC3Z-6A785-A?
You can clean internal oil residue with brake cleaner, but if the plastic retaining ears are fatigued or internal o-rings have flattened, replacing the $55 OEM tube is the only permanent solution.
Q7: Where is part PC3Z-6A785-A located in the engine bay?
It is located on the driver side (left bank) of the 6.7L Powerstroke engine, mounted directly atop the oil separator box on the valve cover, routing toward the center turbo inlet.
Final Thoughts & Key Takeaways
In conclusion, understanding pc3z-6a785-a: ford 6.7l powerstroke crankcase ventilation tube guide provides essential clarity, practical strategies, and actionable advice. By incorporating these foundational insights, adhering to verified safety guidelines, and following structured best practices, you ensure reliable, long-term outcomes while preventing common mistakes. Stay informed, consult certified professionals when needed, and maintain consistent quality care.