Piston Ring Set 4.000 1.5 1.5 4.0mm

The Hastings Piston Ring Set 4.000 1.5 1.5 4.0mm (MPN 2M4346) is a drop-in replacement piston ring kit engineered for 8-cylinder engines requiring a 4.000-inch bore. Built from plasma-moly steel with standard tension characteristics, this ring set delivers the compression sealing and blow-by control required for reliable engine operation across a wide range of applications, from vintage automotive builds to marine and industrial powerplants where OEM or equivalent ring specifications are critical.

The 1.5 x 1.5 x 4.0mm thickness configuration represents a balanced ring geometry for standard-duty service. Plasma-moly coating provides superior corrosion resistance and reduced wear against cylinder walls compared to uncoated steel rings, which is especially valuable in high-humidity or salt-air environments. The standard tension specification ensures proper ring-to-wall contact pressure without excessive drag on the crankshaft, maintaining fuel efficiency while preserving oil control and gas sealing. Drop-in design means this kit is ready for installation into compatible 8-cylinder blocks without custom machining or adaptation.

Mechanics, engine builders, and equipment technicians sourcing replacement piston ring sets for 4.000-inch bore engines benefit from Hastings' OEM supply heritage and quality control standards. This kit is suitable for rebuilds where factory specifications call for a 4-inch bore with these ring dimensions and materials. Confirm bore diameter and ring specifications against your engine manual or parts list before purchase to ensure proper fitment and performance.

Piston ring selection directly impacts compression ratio, oil consumption, and engine longevity. Using OEM-equivalent or OEM-sourced rings like this Hastings set eliminates guesswork and ensures ring-to-piston and ring-to-groove clearances meet factory specifications. Whether rebuilding a classic engine block or maintaining marine or industrial equipment, proper ring installation with new or reconditioned pistons is essential for restoring original performance characteristics.

TacticalSurplusUSA stocks Hastings engine components and OEM-equivalent parts for customers performing complete engine rebuilds or targeted wear-item replacement. Verify all dimensions and OEM compatibility references before ordering, and follow manufacturer installation guidance for proper ring gap setting, seating, and initial break-in procedures.