National 99237 Engine Crankshaft Repair Sleeve - Rear

National 99237 Crankshaft Repair Sleeve

National 99237 is a stainless steel engine crankshaft repair sleeve for rear applications on a wide range of Ford, Mazda, Mercury, and Land Rover vehicles. It is sized for a 2.375-inch shaft and provides a precise repair surface where crankshaft sealing wear has affected performance.

Key Features

• Stainless steel construction for durable sealing-surface repair
• Fits a 2.375-inch shaft size, with 2.374-2.380 inch shaft size range
• Flanged outside diameter: 2.734 inches
• Installation depth: 1.375 inches
• Overall width: 0.938 inches; width on shaft: 0.781 inches
• Engine crankshaft repair sleeve for rear position applications
• National part number 99237 for direct reference and ordering

Detailed Description

This National crankshaft repair sleeve restores a worn sealing surface on the crankshaft where the seal rides, helping return the shaft to a usable condition without replacing the crankshaft assembly. It is built from stainless steel and sized for shafts measuring 2.374 to 2.380 inches, making it a precise repair solution for rear crankshaft seal service. National 99237 is listed for applications including Ford Ranger, Ford Explorer, Ford Mustang, Mazda B4000, Mercury Mountaineer, and Land Rover LR3, along with additional rear-position fitments across the covered vehicle range. This part cross-references Timken KWK99237 for the same application.

What It Is Used For

• Repairing a crankshaft sealing surface worn by the rear main seal
• Addressing oil leakage at the rear of the engine
• Restoring a smooth running surface where seal wear has created grooves
• Supporting service on Ford Ranger and Ford Explorer rear applications
• Providing a repair option for Mazda B4000 and Mercury Mountaineer rear fitments

Installation Notes and Tips

Verify shaft diameter before installation and confirm the sleeve matches the 2.374-2.380 inch shaft range. Clean the crankshaft sealing area thoroughly, inspect for scoring or damage, and install the sleeve to the specified depth of 1.375 inches. Confirm rear-position application before assembly, especially on Ford Mustang, Ford Explorer Sport Trac, and related fitments. Use the vehicle’s service information for final seal and sleeve installation procedures.

Quality Assurance

National has supplied sealing solutions for more than 75 years and develops products for modern vehicle service needs. Part number 99237 is engineered as a stainless steel repair sleeve for consistent fit and sealing-surface restoration.