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Remanufactured Bitzer 6NFCY Bus AC Compressor – Inside the 970cc 6-Cylinder Rebuild | 12V/24V R134a

Remanufactured Bitzer 6NFCY Bus AC Compressor – Inside the 970cc 6-Cylinder Rebuild | 12V/24V R134a

Overview
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The 6NFCY Advantage: 970cc of Pure Cooling Power

When a 12-meter coach or double-decker bus needs serious cooling, a 4-cylinder compressor runs out of breath. The Bitzer 6NFCY doesn't – its six cylinders displace 970 cm³ per revolution, 50% more than the 4-cylinder Bitzer 4NFCY. That extra swept volume translates directly into higher refrigerant flow, faster pull-down times and stable cooling on the hottest routes, from the Middle East to West Africa.

Hunan Weili rebuilds the 6NFCY to genuine OEM specifications under IATF 16949 quality systems – not cosmetic 'repair', but a full engineering-grade remanufacturing process detailed below. The result: the cooling muscle of a new compressor at 40–60% of the price.

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Remanufactured Bitzer 6NFCY – 970cc 6-Cylinder Open-Drive Compressor

4NFCY or 6NFCY? A Straightforward Displacement Decision

Both compressors share the same Bitzer F-series architecture, bore and stroke (70 x 42 mm). The decision is purely about cooling demand:

Comparison	Bitzer 4NFCY	Bitzer 6NFCY
Cylinders	4	6
Swept volume	647 cm³	970 cm³
Displacement @ 1450 rpm	56.2 m³/h	84.4 m³/h
Weight (no clutch)	33.0 kg	40.0 kg
Capacity control (optional)	100-50%	100-66-33%
Best fit	8–10 m buses & trucks	12 m+ coaches & double-deckers

Not sure which one your system needs? Send us your vehicle model, AC unit brand and OEM part number – our engineers will confirm the correct displacement before you order.

How We Rebuild a 6NFCY: The 12-Step Core Revival Process

A genuine remanufactured compressor is not a cleaned-up used part. Every 6NFCY core that passes through our Xiangtan plant follows a fixed, auditable 12-step process:

Incoming Inspection & Core Grading – every core is pressure-tested and graded before it enters the line.
Complete Disassembly – down to the last seal, with all parts tagged and tracked.
Ultrasonic Degreasing – removal of old oil, carbon and debris from every internal passage.
Precision Measurement – bores, journals and surfaces measured against OEM tolerance charts.
Consumable Replacement – new piston rings, bearings, oil seals and gaskets, never reused.
CNC Surface Restoration – worn mating surfaces machined back to factory tolerances.
Dynamic Balancing – rotating assemblies balanced to minimise vibration and bearing wear.
Clean-Room Assembly – rebuilt with genuine-spec components and OEM torque values.
100% Helium Leak Test – every unit, not a sample, is leak-checked under pressure.
Performance Bench Test – cooling capacity and oil pressure verified on the test bench.
Final Audit & QC Tag – a signed quality audit card ships with every compressor.
Protective Packaging – export-grade crate or carton, ready for global freight.

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Inside the Core Revival Workshop – Clean-Line Remanufacturing

Full Technical Specifications

Transparent, industry-compliant data for accurate selection – the same values used by OEM system designers:

Model	Bitzer 6NFCY Compressor (6-NFCY / 6 NFCY)
Cylinder volume	970 cm³ (59.1 CIR)
Displacement (1450 rpm)	84.4 m³/h (2980 CFH)
Displacement (3000 rpm)	174.6 m³/h (6165 CFH)
Cylinders x bore x stroke	6 x 70mm x 42mm (6 x 2.76″ x 1.65″)
Allowed speed range	500 – 3500 1/min
Weight (without clutch)	40.0 kg (88.0 lb)
Magnetic clutch 12V/24V	LA16 (Option, 10 kg)
V-belts	2 x SPB
Max. pressure (LP/HP)	19 / 28 bar (275 / 403 psi)
Connection suction line	2x 35 mm – 2x 1 3/8″
Connection discharge line	35 mm – 1 3/8″
Oil – R134a / R22	BSE 55 (Opt.) / B5.2 (Std.)
Oil charge	2.5 dm³ (88 fl. Oz)
Crankcase heater	70 W, 12 or 24V DC (Option)
Pressure relief valve	Standard
Oil drier	Option
Capacity control	100-66-33% (Option)

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Bitzer 6NFCY – Six-Cylinder Angle View (Actual Stock Photo)

Built for Real-World Duty

Where the rebuilt 6NFCY earns its keep:

12 m+ Coaches & Double-Deckers – roof-mount AC systems from Yutong, King Long and export fleets to Africa, the Middle East and Latin America.

Heavy Trucks & Construction Cabs – HVAC units for Zoomlion, SANY, XCMG, Sunward and Liugong Aolan equipment.

Refrigerated Transport & Cold Chain – partner duty for Thermo King and Carrier systems.

EV & Energy-Storage Thermal Management – auxiliary cooling for new-energy platforms.

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6NFCY Mounted on a Bus Rooftop AC Unit Frame (Application Scene)

Quality Gates & Certifications

Every rebuilt 6NFCY ships with an auditable quality trail:

IATF 16949:2016 certified production – the strictest global automotive quality standard.

ISO 9001, CE & RoHS compliance across the product line.

National High-Tech Enterprise & provincial 'S3N Little Giant' manufacturer.

Backed by long-term R&D partnerships with Tsinghua University and Hunan University.

Exported to 50+ countries with annual revenue exceeding 90 million RMB.

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Bitzer 6NFCY – Studio Product Shot

Bitzer 6NFCY – Frequently Asked Questions

Q: Is this a new or remanufactured compressor? A: It is a professionally remanufactured unit – a used core rebuilt through our 12-step Core Revival process with new consumables, tested 100% before shipment.

Q: Which refrigerant does it use? A: R134a (BSE 55 oil) as standard for bus AC; R22 configurations (B5.2 oil) are available on request.

Q: Can I get it with a magnetic clutch? A: Yes – the LA16 magnetic clutch is available in 12V or 24V DC versions as an option.

Q: How do I know the 6NFCY fits my bus? A: Send us your bus model, AC unit brand and OEM part number; our engineers confirm fitment before you place the order.

Q: What is the delivery time? A: Standard models are ready within 3–7 business days and ship worldwide by sea, air or express.