EC781 OIL FILTER CAP FOR FL2016 2003-2007 6.0L 2008-2010 6.4 | IFJF

iFJF part No.: FJ-CAP03-CK. 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 Precision 36mm Hex Drive : Sharp, well-defined hex flats ensure your socket grips firmly no slipping, no rounding, unlike worn OEM plastic caps. Exact OEM Fitment : Identical thread pitch, height, and sealing surface to the factory cap. Drop-in replacement threads into your existing oil filter housing. 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. 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.