Carrier 5H40 Piston Set (4 PCS) | 5H40-482 Replacement Kit

Piston Assembly for Carrier 5H40 Compressors (MPN: 5H40-482) – Set of 4 (New Unused)

Bring your industrial cooling infrastructure back to factory efficiency with this superior heavy duty replacement Carrier 5H40 Piston Set (4 Pieces). They are cast iron pistons ( MPN: 5H40-482 ) that are specifically designed for Carrier and Carlyle open-drive reciprocating compressors . They have a 3-1/4 inch bore diameter that is finely constructed .

Whether you are servicing maritime HVAC equipment, industrial cold storage or commercial chiller facilities, this new unused replacement kit provides the heavy-duty refrigeration systems with the demanding compression metrics and thermal stability. Each piston assembly is designed to handle high velocity reciprocating loads while providing precise cylinder wall clearances, optimal volumetric efficiency and prolonged life.

Model Details:

• Manufacturer: Carrier / Carlyle
• Manufacturer Part Number (MPN): 5H40-482
• Interchange Part Numbers: 5H40482, PST4-5H40
• Condition: New, Unused (Overstock / Premium Replacement Component)
• Quantity: 1 Pack containing a set of 4 Piston Assemblies

Technical Specifications

Cross-Model Compatibility

• This heavy-duty cast iron piston assembly is fully compatible across a broad lineage of Carrier Carlyle 5H and 6L multi-cylinder reciprocating compressors:
• Carrier/Carlyle 5H Series: 5H40, 5H46, 5H60, 5H66, 5H80, 5H86, 5H120, 5H126
• Carrier/Carlyle 6L Series: 6L40, 6L43, 6L45, 6L60, 6L63, 6L65, 6L80, 6L83, 6L85, 6L120, 6L123, 6L125

Features:

1. Heavy Duty Cast Iron Metallurgy Designed with a high tensile cast iron to ensure thermal expansion rates are similar to the original OEMs to eliminate scuffing or premature wear at high operating temperatures.
2. Micro-Precision Machined Dimensions: engineered to a perfect 3-1/4″ bore profile, providing outstanding compression seal properties and reducing blow-by into the crankcase.
3. Complete Overhaul Hardware Package: Each piston comes with its own wrist pin and retaining clips to minimise assembly variables during a top-end compressor takedown.
4. Universal Multi-Refrigerant Compatibility: Structurally and chemically proven stable for use with synthetic polyolester (POE) or traditional mineral oils in multiple high/low-temp refrigerants.
5. Optimised Skirt Profile: Provides a superior skirt design to enhance the distribution of the hydrodynamic oil film, minimising frictional horsepower losses during part-load operation.

Expert Insight from the Engine Room:

The Carrier 5H series open-drive compressor is a legendary workhorse, but its longevity hinges entirely on top-end tolerances. When a compressor undergoes top-end reconstruction due to worn rings or liquid slugging damage, changing all pistons as a matched bank maintains uniform reciprocating mass balance. Mixing aged, micro-deformed pistons with new replacements causes localized harmonic vibrations that will tear down your main bearings prematurely.