Description
Product Overview
The EC781 Oil Filter Cap is a precision-engineered replacement for the OEM plastic oil filter housing cap found on 2003-2010 Ford F-Series Super Duty trucks and Excursion SUVs with the 6.0L and 6.4L Powerstroke diesel engines. Designed to replace OEM part numbers 3C3Z-6766-CA and 1840754C91, this cap provides reliable sealing and easy removal for every oil change.
Key Features
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Precision 36mm Hex Drive: Sharp, well-defined hex flats ensure your socket grips firmly — no slipping, no rounding, unlike worn OEM plastic caps.
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Exact OEM Fitment: Identical thread pitch, height, and sealing surface to the factory cap. Drop-in replacement — threads into your existing oil filter housing.
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Includes Replacement O-Ring: New O-ring seal included. Always replace the O-ring at every service to prevent the slow oil seepage that's common when old seals are reused.
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Compatible with All FL2016 Cartridges: Works with Motorcraft, WIX, Baldwin, Fleetguard, and all aftermarket FL2016/PF2016-spec filter elements.
Compatibility
| Year |
Make |
Model |
Engine |
| 2003-2007 |
Ford |
F-250/F-350/F-450/F-550 Super Duty |
6.0L Powerstroke V8 |
| 2008-2010 |
Ford |
F-250/F-350/F-450/F-550 Super Duty |
6.4L Powerstroke V8 |
| 2003-2005 |
Ford |
Excursion |
6.0L Powerstroke V8 |
| 2003-2010 |
Ford |
E-350/E-450 Super Duty Van |
6.0L Powerstroke V8 |
Specifications
| Specification |
Value |
| Part Number |
FJ-CAP03-CK |
| OE Cross Reference |
3C3Z-6766-CA, 1840754C91 |
| Socket Size |
36mm Hex |
| Torque Specification |
18-22 ft-lbs (25-30 Nm) |
| Filter Compatibility |
FL2016, PF2016, 57316, BT7349, LF16161 |
| Includes |
Filter Cap + Replacement O-Ring Seal |
Frequently Asked Questions
Q: Is this the same as the OEM plastic cap?
A: It's a direct dimensional replacement but made from higher-quality materials. The OEM cap (3C3Z-6766-CA) is injection-molded plastic that fails over time. Our EC781 cap is engineered for durability with precise machining for reliable socket engagement every oil change.
Q: Does this cap come with an O-ring?
A: Yes. A new O-ring seal is included. Always replace the O-ring at every oil change — reusing old O-rings is the #1 cause of oil filter housing leaks on 6.0L/6.4L engines.
Q: What is the correct installation torque?
A: Tighten to 18-22 ft-lbs (25-30 Nm). Hand-tighten until the O-ring contacts the housing, then 1/4 turn with a torque wrench and 36mm socket. Do NOT exceed 25 ft-lbs — over-torquing can damage the aluminum housing threads.
Q: Does this cap fit all FL2016 filter cartridges?
A: Yes. Compatible with Motorcraft FL2016, WIX 57316, Baldwin BT7349, Fleetguard LF16161, and all other FL2016/PF2016-spec cartridges.
