Sealed Power E-551KC Engine Piston Ring Set

Sealed Power E-551KC Piston Ring Set

Sealed Power E-551KC is a standard-size engine piston ring set for 78.00 mm bores with a 1.5 x 1.5 x 4.0 mm ring groove width profile. It is built for 4-cylinder applications and uses a steel top ring with chrome face, a grey iron second ring, and a 3-piece Flex Vent oil ring design.

Compatible With Mazda Miata, Mazda 323, Mazda MX-3, Mercury Capri, and Mercury Tracer applications listed below, this ring set supports precise cylinder sealing and stable oil control in select 1986-1995 engines. The E-551KC part number is also referenced by several interchange numbers for matching applications.

Key Features

• 78.00 mm bore diameter and outside diameter
• Standard size ring set for 4-cylinder engines
• Top ring: steel with chrome face
• Second ring: grey iron with reverse torsional face design
• Oil ring: 3-piece Flex Vent design
• Ring groove widths: 1.5 mm x 1.5 mm x 4.0 mm
• File fit: No

Detailed Description

Sealed Power designs engine components with modern materials and controlled manufacturing processes to meet the demands of current engine service work. The E-551KC piston ring set is specified for standard 78.00 mm bores and uses a barrel-face top ring for improved seating characteristics, a reverse torsional second ring for ring stability, and a 3-piece Flex Vent oil ring for oil control. This configuration is suited to rebuild and repair work where correct groove width and bore size are critical. This part cross-references 551C and PS1913 for the same application.

Vehicle Fitment

• Fits 1994-1995 Mazda MX-3, N/A. Chrome Steel Top Ring; Ductile 2nd Ring; Premium; Ring Groove Widths: 1.5 (mm), 1.5 (mm), 4.0 (mm); Standard.
• Fits 1986-1994 Mazda 323, N/A. Chrome Steel Top Ring; Ductile 2nd Ring; Premium; Ring Groove Widths: 1.5 (mm), 1.5 (mm), 4.0 (mm); Standard.
• Fits 1991-1994 Mercury Capri, N/A. Chrome Steel Top Ring; Ductile 2nd Ring; Premium; Ring Groove Widths: 1.5 (mm), 1.5 (mm), 4.0 (mm); Standard.
• Fits 1990-1993 Mazda Miata, N/A. Chrome Steel Top Ring; Ductile 2nd Ring; Premium; Ring Groove Widths: 1.5 (mm), 1.5 (mm), 4.0 (mm); Standard.
• Fits 1987-1989 Mercury Tracer, N/A. Chrome Steel Top Ring; Ductile 2nd Ring; Premium; Ring Groove Widths: 1.5 (mm), 1.5 (mm), 4.0 (mm); Standard.

Installation Notes and Tips

• Confirm bore diameter, ring groove widths, and standard-size requirements before assembly.
• Verify piston ring end gap and cylinder wall condition during engine rebuild service.
• Match the ring set to the correct cylinder application and follow the engine builder’s installation procedure.
• Clean ring grooves thoroughly before fitting the new rings.

Quality Assurance

Sealed Power uses leading-edge materials and ISO- and QS-certified manufacturing practices to produce engine parts for demanding service conditions. The E-551KC reflects that manufacturing approach with application-specific ring materials and dimensions for select Mazda and Mercury engines.