^AAEB — 6N21AL-V

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Zulu Code Model

Description

Yanmar 6N21AL-V — a 6-cylinder four-stroke engine with 210mm bore and variable timing. Used as main propulsion on smaller merchant vessels and large fishing boats.

Specifications

Cycle	4-Stroke
Bore	210 mm
Cylinders	6
Fuel Type	MDO

Did you know

The Yanmar 6N21AL-V is part of the N21 series of marine diesel engines, which are widely used in the marine industry. Yanmar has a long history of engine manufacturing, dating back over a century, with the company developing the world's first small diesel engine in 1933.
The 6N21AL-V is a 6-cylinder model within Yanmar's N21 series, which also includes 8-cylinder configurations like the 8N21AL.
This engine is known for its durability, strong performance, and long service life, often utilized as an auxiliary engine to power ship generators, pumping systems, and other onboard equipment. It incorporates technologies like the ASSIGN Combustion System and High Pressure Miller Cycle System to improve fuel consumption and reduce NOx emissions, meeting IMO Tier II emission requirements.

Model	Number of Cylinders	Cylinder Bore × Stroke (mm)	Rated Output (kW)	Engine Speed (min-1)
6N21AL-V	6	210 × 290	745-1020	720/750, 900/1000
8N21AL	8	210 × 290	Not specified in sources	Not specified in sources

Sources: labdhimarine.com; yanmar.com; yanmar.com; scribd.com; malwimarine.com; yanmar.com; navela.hr

Competitive Models

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^AABH RT-flex58T-B

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Spares

Positions 1–12 are the same part on every engine and are safe to quote by code. 13 and 14 vary with cylinder count.

1Cylinder Liner — page under construction
2Piston — page under construction
3Fuel Injector Nozzle — page under construction
4Cylinder Head / Cover — page under construction
5Connecting Rod — page under construction
6Main Bearing — page under construction
7Bottom-End (Crankpin / Con-Rod) Bearing — page under construction
8Fuel Injection Pump — page under construction
9Fuel Injector (Complete) — page under construction
10Exhaust Valve — page under construction
11Inlet Valve — page under construction
12Piston Ring Set — page under construction
13Crankshaft — page under construction
14Camshaft — page under construction

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Code map

^A  A  E  B
 │  │  │  └── Model: 6N21AL-V
 │  │  └───── Make: Yanmar
 │  └──────── Equipment: Main Engine
 └─────────── System: ME, Propulsion & Steering