This is a rear crankshart seal and wear ring installer for use on 4.5L, 6.0L, and 6.4L Ford powerstroke. This tool will work on the following applications:Ford E-150, E-250, E-350, and E-450 equipped with 6.0L Power Stroke Diesel model years 2004, 2005, 2006, 2007, 2008, and 2009.
Ford Excursion equipped with 6.0L Power Stroke Diesel model years 2003, 2004, and 2005.
Ford Super Duty F-250, F-350, F-450, and F-550 equipped with 6.0L Power Stroke Diesel model years 2003, 2004, 2005, 2006, and 2007.
Ford Super Duty F-250, F-350, F-450, and F-550 equipped with 6.4L Power Stroke Diesel model years 2008 and 2009.
Ford Super Duty F-650/750 equipped with 6.0L Power Stroke Diesel model years 2004, 2005, 2006, and 2007.
Ford Low Cab Forward equipped with 4.5L Power Stroke Diesel model years 2006, 2007, 2008, and 2009.This is a replacement to part number ZTSE-4518, and 303-771.
The ATCZTSE4518 Rear Crankshaft Seal & Wear Ring Installer (OEM 303-771 / ZTSE-4518) is a professional diesel service tool engineered to install the rear main crankshaft oil seal and wear ring on heavy-duty Ford PowerStroke diesel engines — specifically the 4.5 L, 6.0 L, and 6.4 L platforms used across Ford Super Duty, E-Series, Excursion, and Low Cab Forward applications. This tool provides accurate, damage-free installation of the seal and wear ring assembly, helping technicians achieve a proper fit and long-lasting engine performance without risking distortion or misalignment of critical sealing surfaces.
Rear crankshaft seals play a vital role in preventing oil leaks and maintaining crankcase pressure. On high-torque diesel engines like the PowerStroke lineup, improper installation of the rear seal can lead to oil seepage between the engine and transmission, contamination of the clutch or torque converter, and increased service costs. The ATCZTSE4518 allows controlled, concentric press fitting — eliminating common issues caused by improvised tools such as hammers or oversized sockets that can damage the sealing lip or crankshaft journal.
Designed for professional mechanics, fleet service departments, and heavy-duty truck shops, this installer is built from rugged steel and delivered ready for repeated use in demanding work environments. It’s the OEM-style solution for technicians who need consistency and precision when servicing rear main seals on PowerStroke diesel engines.
Key Features & Benefits
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OEM Replacement Tool: Direct aftermarket equivalent to Ford 303-771 / ZTSE-4518 rear crankshaft seal and wear ring installer.
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Precision Engineered: Helps install rear main seals and wear rings concentric with the crankshaft to prevent leaks and premature wear.
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Damage-Free Service:
Eliminates the risk of seal lip flaring, housing distortion, or
crankshaft surface damage that can occur with makeshift methods.
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Heavy-Duty Construction: Built for repeated use in professional shops, dealerships, and fleet maintenance facilities.
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Time-Saving: Speeds rear main seal replacement when compared to ad-hoc approaches, reducing downtime and rework.
Applications
Designed for rear crankshaft seal and wear ring installation on the following diesel engine platforms:
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Ford 4.5 L PowerStroke diesel (Low Cab Forward and similar applications).
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Ford 6.0 L PowerStroke diesel — Super Duty, E-Series, Excursion, F-650/750 (2003–2010).
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Ford 6.4 L PowerStroke diesel — Super Duty (2008–2009).
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Navistar VT365 / MaxxForce7 variants using compatible rear seal configurations.
This installer is ideal whenever a rear main seal or wear ring service is needed during engine rebuilds, rear main leak repairs, or transmission separation procedures.
Why It Matters
Replacing the rear crankshaft seal on a heavy-duty diesel engine is a precision job. The seal must be seated perfectly square and at precise depth to ensure an oil-tight fit — especially on multi-stage pressure seals found in PowerStroke engines. Incorrect installation can lead to oil leaks at the engine-transmission junction, contamination of drivetrain components, and unnecessary repeat repairs. Using a correct installer tool like the ATCZTSE4518 helps avoid these pitfalls and supports reliable, long-term engine sealing performance.
Ford Excursion equipped with 6.0L Power Stroke Diesel model years 2003, 2004, and 2005.
Ford Super Duty F-250, F-350, F-450, and F-550 equipped with 6.0L Power Stroke Diesel model years 2003, 2004, 2005, 2006, and 2007.
Ford Super Duty F-250, F-350, F-450, and F-550 equipped with 6.4L Power Stroke Diesel model years 2008 and 2009.
Ford Super Duty F-650/750 equipped with 6.0L Power Stroke Diesel model years 2004, 2005, 2006, and 2007.
Ford Low Cab Forward equipped with 4.5L Power Stroke Diesel model years 2006, 2007, 2008, and 2009.
Rear crankshaft seals play a vital role in preventing oil leaks and maintaining crankcase pressure. On high-torque diesel engines like the PowerStroke lineup, improper installation of the rear seal can lead to oil seepage between the engine and transmission, contamination of the clutch or torque converter, and increased service costs. The ATCZTSE4518 allows controlled, concentric press fitting — eliminating common issues caused by improvised tools such as hammers or oversized sockets that can damage the sealing lip or crankshaft journal.
Designed for professional mechanics, fleet service departments, and heavy-duty truck shops, this installer is built from rugged steel and delivered ready for repeated use in demanding work environments. It’s the OEM-style solution for technicians who need consistency and precision when servicing rear main seals on PowerStroke diesel engines.
Key Features & Benefits
-
OEM Replacement Tool: Direct aftermarket equivalent to Ford 303-771 / ZTSE-4518 rear crankshaft seal and wear ring installer.
-
Precision Engineered: Helps install rear main seals and wear rings concentric with the crankshaft to prevent leaks and premature wear.
-
Damage-Free Service: Eliminates the risk of seal lip flaring, housing distortion, or crankshaft surface damage that can occur with makeshift methods.
-
Heavy-Duty Construction: Built for repeated use in professional shops, dealerships, and fleet maintenance facilities.
-
Time-Saving: Speeds rear main seal replacement when compared to ad-hoc approaches, reducing downtime and rework.
Applications
Designed for rear crankshaft seal and wear ring installation on the following diesel engine platforms:
-
Ford 4.5 L PowerStroke diesel (Low Cab Forward and similar applications).
-
Ford 6.0 L PowerStroke diesel — Super Duty, E-Series, Excursion, F-650/750 (2003–2010).
-
Ford 6.4 L PowerStroke diesel — Super Duty (2008–2009).
-
Navistar VT365 / MaxxForce7 variants using compatible rear seal configurations.
This installer is ideal whenever a rear main seal or wear ring service is needed during engine rebuilds, rear main leak repairs, or transmission separation procedures.
Why It Matters
Replacing the rear crankshaft seal on a heavy-duty diesel engine is a precision job. The seal must be seated perfectly square and at precise depth to ensure an oil-tight fit — especially on multi-stage pressure seals found in PowerStroke engines. Incorrect installation can lead to oil leaks at the engine-transmission junction, contamination of drivetrain components, and unnecessary repeat repairs. Using a correct installer tool like the ATCZTSE4518 helps avoid these pitfalls and supports reliable, long-term engine sealing performance.
