National 711125 Engine Crankshaft Seal - Rear

Engine Crankshaft Seal Overview

National 711125 is an engine crankshaft seal built for rear applications on select Jeep and Ram vehicles. It uses a PTFE sealing material and a counter-clockwise spiral lip design to support controlled sealing performance in demanding engine environments.

Key Features

• PTFE sealing material for low-friction sealing contact.
• Counter-clockwise spiral lip design for directional sealing performance.
• Metric dimensions for precise housing and shaft matching.
• Part of National Series 711100 sealing components.
• Engine oil seal construction for crankshaft sealing service.

Detailed Description

This National crankshaft seal, part number 711125, is engineered with a PTFE lip and a counter-clockwise spiral profile to help maintain a consistent seal at the crankshaft. The listed dimensions include a 115.000 mm housing bore, 115.300 mm outside diameter, 100.000 mm shaft size, and 7.000 mm width, which are important reference points when matching the seal to the application. It is a direct-fit sealing component for rear crankshaft service on 2014-2019 Jeep Grand Cherokee and 2014-2018 Ram 1500 applications. National 711125 is part of the 711100 series and reflects the brand’s long history in sealing products. This part cross-references Mopar 68148406AA and SL260256 for the same application.

Common Issues This Seal Can Address

• Engine oil leakage at the crankshaft seal area.
• Seepage from a worn or hardened rear main seal.
• Loss of sealing performance from heat and age.
• Contamination around the crankshaft opening from failed sealing surfaces.

Installation Notes and Tips

Verify housing bore, shaft diameter, and width before installation. Clean the sealing surface thoroughly and inspect the crankshaft for wear or scoring that could affect seal life. Confirm rear application placement and match the seal orientation to the engine’s rotation requirements.

Quality Assurance

National has supplied premium sealing solutions for more than 75 years and continues to develop sealing products for modern vehicle applications. Part number 711125 is backed by that sealing-focused engineering heritage.