Fel-Pro 71321 Spark Plug Tube Seal

Fel-Pro Spark Plug Tube Seal 71321

Fel-Pro 71321 is a molded rubber spark plug tube seal built for real-world repair conditions. It is designed to help maintain a reliable seal on engines where sealing surfaces are not perfect, making it a practical choice for Ford and Lincoln secondary ignition service.

Key Features

• Molded rubber construction for consistent sealing performance
• Premium grade type for repair-focused applications
• Designed to address imperfect sealing surfaces
• Lower inside diameter: 1.14
• Lower outside diameter: 1.676
• Upper inside diameter: 1.14
• Upper outside diameter: 1.676
• Thickness: 0.449

Detailed Description

Fel-Pro 71321 spark plug tube seal is engineered for secondary ignition service where a dependable seal matters. The molded rubber material helps support a tight fit in the valve cover area, while the premium construction reflects Fel-Pro’s focus on repair applications that need dependable sealing on worn or uneven surfaces. This part cross-references MAHLE B33509 for the same application. It is a direct-fit service part for many Ford F-150, Ford Explorer, Ford Bronco, and Lincoln Navigator applications, along with additional Ford and Lincoln models listed in the fitment data.

What It Helps Fix

• Oil leaking into spark plug tubes
• Moisture intrusion around spark plug wells
• Misfire concerns caused by contaminated plug tubes
• Loss of sealing at the valve cover spark plug tube area
• Service issues on aging or imperfect sealing surfaces

Installation Notes and Tips

Verify the seal dimensions against the original part before installation. Clean the sealing surfaces thoroughly and inspect the surrounding valve cover area for wear, damage, or residue that could affect the seal. Confirm vehicle application by year, make, and model before ordering. Fits 2021-2025 Ford Bronco, N/A; Fits 2015-2025 Ford Expedition, N/A; Fits 2011-2025 Ford Explorer, N/A; Fits 2011-2025 Ford F-150, N/A; Fits 2024-2025 Ford Ranger, N/A; Fits 2015-2025 Ford Transit-150, N/A; Fits 2015-2025 Ford Transit-250, N/A; Fits 2015-2025 Ford Transit-350, N/A; Fits 2015-2025 Ford Transit-350 HD, N/A; Fits 2020-2025 Lincoln Aviator, N/A; Fits 2015-2025 Lincoln Navigator, N/A; Fits 2007-2024 Ford Edge, N/A; Fits 2011-2023 Ford Mustang, N/A; Fits 2019-2023 Lincoln Nautilus, N/A; Fits 2018-2022 Ford EcoSport, N/A; Fits 2017-2022 Ford GT, N/A; Fits 2010-2020 Ford Fusion, N/A; Fits 2019-2020 Ford SSV Plug-In Hybrid, N/A; Fits 2014-2020 Ford Transit Connect, N/A; Fits 2017-2020 Lincoln Continental, N/A; Fits 2007-2020 Lincoln MKZ, N/A; Fits 2013-2019 Ford Escape, N/A; Fits 2009-2019 Ford Flex, N/A; Fits 2008-2019 Ford Taurus, N/A; Fits 2015-2019 Lincoln MKC, N/A; Fits 2010-2019 Lincoln MKT, N/A; Fits 2013-2018 Ford C-Max, N/A; Fits 2012-2018 Ford Focus, N/A; Fits 2007-2018 Lincoln MKX, N/A; Fits 2009-2016 Lincoln MKS, N/A; Fits 2008-2009 Ford Taurus X, N/A; Fits 2008-2009 Mercury Sable, N/A.

Quality Assurance

Fel-Pro gaskets are developed for repair environments and use proprietary materials to help deliver reliable sealing performance on challenging applications. The brand’s focus on imperfect sealing surfaces makes this spark plug tube seal a practical service part for Ford and Lincoln ignition maintenance.