Yanmar NF60 Diesel Engine with Kaji YD2A-0.75 Compressor

Yanmar NF60 Diesel Engine coupled with Kaji YD2A-0.75 Air Compressor Package (Workshop Tested)

The Yanmar NF60 Diesel Engine and Kaji YD2A-0.75 Air Compressor combine to create a powerful self-contained diesel powered emergency air compressor kit, for maritime vessel black-start applications, industrial backup pneumatic systems and offshore facilities.

This package is designed for maximum reliability in emergencies, combining Yanmar’s single-cylinder horizontal four-stroke direct-injection NF60 diesel engine with Kaji Technology Corporation’s high-efficiency YD2A-0.75 reciprocating air compressor head. The device is designed to be completely independent of the main electrical busbars and supplies the high pressure starting air to the main engine receivers, generator air vessels and auxiliary pneumatic systems in case of complete vessel power loss.

This particular build has been bench tested in our maritime engineering workshop for air discharge delivery, operating temperature stabilization, lubricating oil pressure retention and compression efficiency across the complete operating RPM ranges.

Model Details

• Engine Model: Yanmar NF60 / NF60-HF
• Compressor Head Model: Kaji YD2A-0.75 (Kaji Iron Works Ltd.)
• Assembly Part / MPN: YAN-NF60-KAJI-YD2A075
• Drive Type: Direct Flywheel / Heavy-Duty Belt Coupling with Protective Guard
• Configuration: Horizontal Skid-Mounted Emergency Diesel Air Compressor Unit

Key Features

1. Black-Start Emergency Capability: Operates without external electrical power using hand-crank start mechanisms, guaranteeing air production during vessel power failure.
2. Dual-Stage High-Efficiency Compression: Kaji YD2A-0.75 reciprocating piston pump provides rapid air receiver charge up to maximum working pressure ratings.
3. Heavy-Duty Fuel & Thermal Management: Water-cooled/hopper-cooled Yanmar NF60 diesel engine ensures low specific fuel consumption (SFC) and prolonged running cycles under continuous load.
4. Compact Skid-Mounted Footprint: Modular baseplate design allows easy retrofit into tight steering gear compartments, emergency generator rooms, or engine room workshops.
5. Bench-Tested & Overhauled: Fully inspected valve plates, piston rings, cylinder liners, fuel injection pump, and crankshaft clearances to ensure immediate operational readiness.

Compatible Vessel & Equipment Models

• Emergency Starting Air Systems: Designed for vessel starting air bottles ranging from 50L to 250L capacities.
• Auxiliary Diesel Generators: Serves as dedicated dead-ship starting compressor for Yanmar 6HAL/6RAL series, Daihatsu DK/DC series, and Caterpillar 3400/3500 series gensets.
• Circuit Breakers & Industrial Systems: Fits industrial medium-voltage gas/air circuit breaker pressuring systems utilizing Kaji YD2A series compressor manifolds.

Cross-Reference Part Numbers

• Yanmar Engine Assembly: NF60, NF60-HF, NF50, TS60, YDG-series engine blocks
• Kaji Compressor Head: YD2A-0.75, YD2A-2.2C, YD2-series reciprocating units
• Equivalent Emergency Air Units: Tanabe LSHC-20B, Sperre HL2/77, J.P. Sauer WP15L-200, Matsubara MS-75

Applications

• Emergency Shipboard Starting Air: Primary dead-ship start device on merchant vessels, tugboats, fishing trawlers, and offshore supply vessels (OSVs).
• Industrial Gas & Circuit Breakers: Air compression for sub-station pneumatic switchgears and high-voltage circuit breakers.
• Remote Standby Power Units: Remote off-grid sites requiring non-electric, diesel-driven high-pressure air source.
• Shipyard & Repair Docks: Portable high-pressure air supply for pressure testing valves, pipes, and vessel tanks.

Marine Engineer Expert’s Guide

1) Black-Start Decompression Procedure

Pro Tip: When manually starting the Yanmar NF60 in a dead-ship scenario, always engage the decompression lever before cranking. Crank the engine rapidly up to top rotational speed before releasing the decompression lever. This prevents hydraulic lock and ensures immediate ignition, even in low ambient engine room temperatures.

2) Valve Plate Maintenance & Carbon Buildup Control

When operating the Kaji YD2A-0.75 compressor, high operating discharge temperatures can lead to carbon deposits on the 2nd stage suction and discharge valve discs.

Inspect suction/discharge valve assemblies every 250 operating hours.

Clean disc valves using carbon solvent; never use abrasive emery paper that can score the stainless steel seating faces.

Ensure valve clearance and spring tension match OEM specs to prevent thermal backflow and loss of volumetric efficiency.

3) Lubricating Oil Selection for Marine Environments

Engine (Yanmar NF60): Use API CF/CG-4 SAE 30 or 15W-40 heavy-duty marine diesel oil.

Compressor (Kaji YD2A-0.75): Use ISO VG 100 non-detergent reciprocating air compressor oil. Do not use detergent engine oil inside the compressor crankcase, as it emulsifies condensed moisture and causes premature bearing wear.

Frequently Asked Questions

What is the primary function of the Yanmar NF60 with Kaji YD2A-0.75 set?

It functions as a standalone, diesel-driven emergency air compressor designed to build up high-pressure starting air for main engines or generator sets during a complete power failure on ships or industrial facilities.

Can this air compressor set be manually hand-cranked?

Yes, the Yanmar NF60 engine is equipped with a manual hand-start handle and a mechanical decompression mechanism, allowing full manual operation without relying on electrical batteries.

What maximum pressure can the Kaji YD2A-0.75 compressor achieve?

The Kaji YD2A-0.75 two-stage reciprocating compressor head reliably delivers working pressures between 25 bar (2.5 MPa) and 35 bar (3.5 MPa).

Is this unit supplied ready to install on a vessel?

Yes, the package is mounted on a rigid skid base, fully overhauled, bench-tested under load, and delivered with a workshop test certificate for immediate shipboard installation.

What maintenance is required for the cooling system?

For hopper-cooled configurations, ensure the cooling water reservoir is topped up with fresh water treated with anti-corrosion additives before starting. Check coolant levels during prolonged running cycles.