Sealed Power W525AP Engine Piston

Sealed Power W525AP Engine Piston for Jeep 4.2L Applications

The Sealed Power W525AP is a standard-size cast engine piston built for Jeep inline-six applications that require a recessed-head design and precise compression geometry. It is a direct-fit piston option for classic Jeep Cherokee, Wrangler, Comanche, Wagoneer, CJ7, and Scrambler engine rebuilds where bore, pin, and ring specifications must match the original setup.

Key Features

• Standard-size engine piston with a 3.8750 in. bore (98.4200 mm)
• Cast construction for traditional rebuild applications
• 1.580 in. compression distance
• Recessed head design with .116 in. deep recess and 9.2:1 compression ratio specification
• Negative 14.0 cc dome volume
• 0.931 in. pin diameter with 0.06 in. pin offset
• Ring groove layout: 5/64 in., 5/64 in., and 3/16 in.
• Minimum clearance listed at 0.001 in. at 2.420 in. from top of head

Detailed Description

Sealed Power W525AP is engineered for Jeep engine rebuilds that call for a standard-size piston with a recessed head profile and cast material construction. The piston’s 3.8750-inch bore, 1.580-inch compression distance, and negative 14.0 cc dome volume align with the compression and chamber requirements listed for 1983-1995 Jeep applications. This makes the W525AP a practical choice for restoring compression characteristics in Jeep Cherokee, Wrangler, Comanche, Wagoneer, CJ7, and Scrambler engines.

Sealed Power uses modern materials and ISO- and QS-certified manufacturing processes to produce engine components that meet demanding service requirements. For buyers searching for a Jeep Cherokee piston, Jeep Wrangler engine piston, or Jeep CJ7 replacement piston, part number W525AP provides the dimensional details needed for a proper rebuild decision.

Vehicle Fitment

• Fits 1984-1995 Jeep Cherokee, N/A
• Fits 1987-1995 Jeep Wrangler, N/A
• Fits 1986-1992 Jeep Comanche, N/A
• Fits 1984-1987 Jeep Wagoneer, N/A
• Fits 1983-1986 Jeep CJ7, N/A
• Fits 1983-1985 Jeep Scrambler, N/A

Common Repair Uses

• Restoring worn or damaged piston assemblies during an engine rebuild
• Correcting low compression caused by piston wear or ring groove damage
• Replacing a piston with the specified bore, pin, and compression dimensions
• Addressing oil control concerns tied to piston and ring wear
• Returning Jeep 4.2L-style engines to factory-style compression geometry

Installation Notes

Verify bore size, compression distance, pin diameter, and ring groove widths before installation. The W525AP is a standard-size piston, so cylinder condition and machine work should be checked carefully during rebuild preparation. Confirm minimum clearance, ring fitment, and head recess depth against the engine’s service specifications before final assembly.

Quality Assurance

Sealed Power engine parts are manufactured with controlled processes and materials intended for modern engine service demands. Part number W525AP is built to the dimensional and material specifications listed above for Jeep rebuild applications.