Sealed Power 4125M Engine Crankshaft Main Bearing Set

Overview of Sealed Power Engine Crankshaft Main Bearing Set 4125M

The Sealed Power 4125M Engine Crankshaft Main Bearing Set is designed as an OE replacement for Ford small block engines with 289 and 302 cubic inch displacement. This main set is engineered to meet the specifications required for reliable engine performance in various Ford, Lincoln, and Mercury vehicles.

• OE replacement main bearing set for Ford small block engines
• Compatible with 289 and 302 cubic inch displacement engines
• Constructed from overplated copper-lead alloy for durability
• Includes standard and undersized bearings: Std, -1, -10, -20, -30, -40
• Fits a wide range of Ford, Lincoln, and Mercury models

Detailed Product Description and Attributes

The Sealed Power 4125M main bearing set is manufactured specifically for Ford small block engines, including the 289 and 302 cubic inch displacement variants. Made from an overplated copper-lead alloy, these bearings provide a balance of strength and wear resistance essential for maintaining proper crankshaft alignment and smooth engine operation. The set includes multiple size options—standard and undersized increments (-1 to -40)—allowing precise fitment during engine rebuilds or repairs. This main set is compatible with a broad range of vehicles such as the Ford Mustang, F-150, Bronco, Lincoln Continental, Mercury Cougar, and several Econoline models, ensuring versatility across Ford’s small block engine lineup.

Compatible Vehicles and Applications

• Ford Mustang (289, 302 engines)
• Ford F-100, F-150, F-250, F-350 trucks
• Ford Bronco and Explorer
• Lincoln Continental, Mark VI, Mark VII
• Mercury Cougar, Grand Marquis, Marquis, Villager
• Ford Econoline series (E-100, E-150, E-250, E-350 and Club Wagon variants)

Common Engine Issues Addressed

• Excessive crankshaft end play or bearing clearance
• Engine knocking due to worn main bearings
• Oil pressure loss related to bearing wear
• Crankshaft damage prevention during rebuilds
• Restoring proper bearing fit after machining or wear

Installation Notes and Tips

• Verify engine displacement and bearing size before installation
• Measure crankshaft journals to select correct bearing size from the set
• Clean all bearing surfaces and lubricate bearings prior to assembly
• Follow manufacturer torque specifications for main bearing caps
• Inspect crankshaft journals for wear or damage before installation

Quality Assurance and Warranty

Sealed Power manufactures the 4125M main bearing set to meet OEM standards for durability and performance. The overplated copper-lead alloy construction ensures consistent wear resistance and reliable engine operation. While specific warranty details may vary, Sealed Power products typically come with a limited warranty against manufacturing defects, providing confidence in the product’s quality and longevity.