BBTV 6872 Engine Piston Ring

Engine Piston Ring Set Overview

This engine piston ring set, part number 6872, is built for 85.00 mm bores with standard oversize dimensions. It uses grey iron and steel rail/stainless expander construction with phosphate and chrome surface treatments for controlled wear characteristics.

Key Features

• Part number 6872 for a direct engine sealing application
• Standard bore size: 85.00 mm / 3.346 in.
• Top ring and second ring made from grey iron
• Steel rail and stainless expander oil ring design
• Phosphate and chrome surface treatments for ring durability
• Configured for 4-cylinder engines

Detailed Description

Part number 6872 is an engine piston ring set for 4-cylinder applications that require an 85.00 mm standard bore. The ring package combines a grey iron top ring and second ring with a steel rail and stainless expander oil ring, along with phosphate and chrome surface finishes to support consistent sealing and wear control. This makes it a practical choice for engine rebuild work where bore size and ring construction must match the original specification. It fits 1971-1977 Toyota Corolla, 1971-1973 Toyota Carina, and other listed Nissan and Subaru applications, including 1977-1979 Nissan 200SX and 1973-1976 Subaru DL. The part number 6872 also cross-references Monroe Shocks & Struts (e.g., 9099X, 12123P) for the same application.

What It Is Used For

• Restoring cylinder sealing in worn engines
• Reducing oil control issues caused by ring wear
• Addressing compression loss from aged piston rings
• Supporting rebuilds that require standard bore fitment
• Replacing rings specified for 4-cylinder engine service

Installation Notes and Tips

Verify the cylinder bore is 85.00 mm before installation and confirm the engine calls for standard oversize rings. Match the ring set to the listed application and inspect cylinder wall condition, ring end gap, and groove cleanliness during assembly. Fitment includes 1971-1977 Toyota Corolla, 1971-1973 Toyota Carina, 1977-1979 Nissan 200SX, and other listed Nissan and Subaru models; use the exact engine specification for final confirmation.

Quality Assurance

Use this ring set only where the bore size, ring materials, and surface treatments match the engine specification. Part number 6872 is cataloged for the listed applications and should be verified against the engine build requirements before assembly.