Piston Ring Compressor Band – 5-1/4" to 5-1/2"

Make piston and cylinder installation easier with the Piston Ring Compressor Band, designed for large-bore engines using pistons measuring 5-1/4" to 5-1/2" in diameter.

The compressor band applies even pressure around the piston rings, holding them securely within their grooves while the cylinder is installed over the piston. This helps reduce the risk of snagging, chipping, or breaking piston rings during cylinder installation.

Designed for use with compatible Ring-O-Matic-style piston ring compressor pliers, the quick-change band is an excellent specialty tool for cylinder replacement, top overhauls, and complete engine rebuilds.

Product Features

• Size Range: 5-1/4" – 5-1/2"
• Designed for large-bore piston applications
• Provides even piston ring compression
• Helps prevent ring damage during cylinder installation
• Quick-change band design
• Reusable professional engine service tool
• Ideal for cylinder changes and top overhauls
• Compressor band only – pliers/handle sold separately

Engine Compatibility

The engines with piston/cylinder dimensions falling within its 5.25"–5.50" working range.

Common applications include select:

Continental 520 Series

• IO-520
• TSIO-520
• GTSIO-520

Continental 550 Series

• IO-550
• TSIO-550
• TSIOF-550
• IOF-550
• Select other 550-series configurations

These Continental 520- and 550-series engines commonly use a 5.25-inch cylinder bore, making the particularly useful when servicing these large-bore Continental engines.