Sealed Power E-978K Engine Piston Ring Set

Sealed Power E-978K Engine Piston Ring Set

Sealed Power E-978K is a standard-size engine piston ring set built for 100.40 mm bores and 6-cylinder applications. It combines a steel top ring with chrome facing, a grey iron second ring with phosphate coating, and a 3-piece flex vent oil ring for precise sealing in Ford and Mercury V6 engines.

Key Features

• Standard-size piston ring set for 100.40 mm bore diameter
• Top ring material: steel with chrome face for wear resistance
• Second ring material: grey iron with phosphate coating
• Top ring face design: barrel face
• Second ring face design: reverse torsional
• Oil ring design: 3-piece flex vent
• Ring groove widths: 1.2 mm top, 1.5 mm second, 3.0 mm oil
• Fits 2002-2011 Ford Ranger, N/A
• Fits 2002-2010 Ford Explorer, N/A
• Fits 2007-2010 Ford Explorer Sport Trac, N/A
• Fits 2002-2005 Ford Explorer Sport Trac, N/A
• Fits 2005-2010 Ford Mustang, N/A
• Fits 2002-2010 Mercury Mountaineer, N/A
• Fits 2002-2003 Ford Explorer Sport, N/A

Detailed Description

Built for engine rebuilds that require accurate ring-to-groove matching, Sealed Power E-978K is engineered around a 100.40 mm bore and standard sizing. The ring package uses a chrome-faced steel top ring for the upper compression position, a grey iron second ring with phosphate coating for the second land, and a 3-piece flex vent oil ring to manage oil control and cylinder sealing. This part number, E-978K, is listed for Ford Ranger, Ford Explorer, Ford Explorer Sport Trac, Ford Mustang, Mercury Mountaineer, and Ford Explorer Sport applications across the 2002-2011 model years.

Sealed Power focuses on modern manufacturing methods and materials selection to meet the demands of current engine service work. This piston ring set cross-references 2C5187 for the same application.

Common Repair Uses

• Restoring compression loss caused by worn piston rings
• Reducing oil consumption from worn oil control rings
• Addressing blow-by and crankcase pressure buildup
• Supporting cylinder sealing during engine overhaul work
• Replacing damaged or worn rings during a rebuild

Installation Notes and Tips

Verify bore diameter, ring groove widths, and standard-size requirements before installation. Confirm the top, second, and oil ring positions match the specified 1.2 mm x 1.5 mm x 3.0 mm groove layout. Check cylinder wall condition, ring end gap, and piston groove cleanliness during assembly. For best results, follow the engine builder’s service procedures for ring orientation and break-in.

Quality Assurance

Sealed Power uses modern materials and ISO- and QS-certified manufacturing processes to produce engine components for demanding service applications. The E-978K part number is built to support consistent fit and function in the listed Ford and Mercury engines.