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National 710878 Engine Crankshaft Seal - Front
| Brand | National 710878 |
|---|---|
| Position | Front |
| Inside Diameter | 2.539 |
| Inside Diameter | 64.500 |
| Thickness | 0.374 |
| Thickness | 9.500 |
| Outside Diameter | 3.512 |
| Outside Diameter | 89.200 |
| Helix Type | Clockwise-spiral lip design |
| Housing Bore (Inch) | 3.504 |
| Housing Bore (MM) | 89.000 |
| Material | Fluoro-elastomer |
| Outside Diameter (Inch) | 3.512 |
| Outside Diameter (mm) | 89.200 |
| Overall Width with Side Lip (MM) | 11.800 |
| Overall Width with Side Lip (Inch) | 0.465 |
| Part Description | Oil seal |
| Series | 710800 |
| Shaft (Inch) | 2.539 |
| Shaft (MM) | 64.500 |
| Type | 40 |
| Unit of Dimension | Inch |
| Width (Inch) | 0.374 |
| Width (mm) | 9.500 |
| Fits | Ford · 6 vehicles |
Fluoro-elastomer material. Helps resist heat and wear in demanding sealing applications.
Clockwise-spiral lip design. Promotes consistent sealing performance as the shaft turns.
Oil seal. Engine crankshaft seal for dependable sealing in the engine.
Cross-references Four Seasons 26788, MAHLE 67831 and Timken SL260025 for the same application. See all 6.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
National 710878 Crankshaft Seal Overview
National 710878 is an engine crankshaft seal built for front-end sealing performance in select Ford Super Duty applications. It uses a fluoro-elastomer sealing material and a clockwise-spiral lip design to help maintain a consistent seal at the crankshaft. Fits 2008-2010 Ford F-250 Super Duty, front and 2008-2010 Ford F-350 Super Duty, front.
Key Features
- Part number 710878 engine crankshaft seal
- Fluoro-elastomer construction for sealing durability
- Clockwise-spiral lip design
- Inside diameter: 2.539 in. / 64.500 mm
- Outside diameter: 3.512 in. / 89.200 mm
- Thickness: 0.374 in. / 9.500 mm
- Housing bore: 3.504 in. / 89.000 mm
- Overall width with side lip: 0.465 in. / 11.800 mm
Detailed Description
National 710878 is an oil seal for the front crankshaft position on select Ford F-250 Super Duty and Ford F-350 Super Duty trucks from 2008 through 2010. The seal’s fluoro-elastomer material is selected for engine sealing environments, while the clockwise-spiral lip design helps manage oil control at the shaft interface. National has supplied sealing products for decades, and this part reflects that focus on dimensional accuracy and modern sealing design. This part cross-references Timken SL260025 for the same application.
What This Seal Helps Address
- Front crankshaft oil leakage
- Oil seepage around the crankshaft snout
- Seal wear from heat and engine operation
- Loss of sealing integrity at the housing bore
- Replacement needs during engine front-end service
Installation Notes and Tips
Verify shaft diameter, housing bore, and seal orientation before installation. The clockwise-spiral lip design must be installed in the correct direction for proper oil control. Clean the sealing surface and housing thoroughly, and inspect the crankshaft for grooves or damage that could affect sealing. Confirm fitment for 2008-2010 Ford F-250 Super Duty and 2008-2010 Ford F-350 Super Duty, front, before assembly.
Quality Assurance
National has more than 75 years of experience in sealing solutions and continues to develop products for current vehicle platforms. Part number 710878 is engineered to meet the dimensional and material requirements listed above for the specified Ford Super Duty front crankshaft applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2010 | Ford | F-250 Super Duty | 6.4L | V8 | Front | — |
| 2010 | Ford | F-350 Super Duty | 6.4L | V8 | Front | — |
| 2009 | Ford | F-250 Super Duty | 6.4L | V8 | Front | — |
| 2009 | Ford | F-350 Super Duty | 6.4L | V8 | Front | — |
| 2008 | Ford | F-250 Super Duty | 6.4L | V8 | Front | — |
| 2008 | Ford | F-350 Super Duty | 6.4L | V8 | Front | — |
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