The Yanmar N21 engine was officially launched in 1996 alongside the smaller N18 engine as part of Yanmar’s N series of latest medium-speed diesel engines at the time. The N21 engine was developed primarily as a auxiliary engine for medium to large sized commercial vessels such as containers and cargo vessels and as a propulsion drive for smaller vessels such we tugs, AHTS vessels and offshore support vessels, with the 8N21 engine models being especially used in the propulsion role for the smaller vessels sailing in Asia. With a cylinder bore size of 210 mm and a stroke of 290 mm, the N21 engine produces power in the range of 660 kW to 950 kW, with a crankshaft speed of about 720 rpm to 900 rpm. The Yanmar N21 engine was one of the most compact medium-speed diesel engines that had applications as an auxiliary and propulsion engine at the time of its launch and that made it a very popular choice among vessel owners. The N21 engine also features advanced combustion systems for fuel efficiency and was compatible with HFO and MDO. The N21 engines have N and V variants. Both are in-line engine configurations but feature differences in some parts with the most notable example being the pistons – flat top for the N type and valve pockets on the top for the V type. 

Production of N21 engines has been stopped by Yanmar, with engines being made only on specific orders from shipowners. But there are still many N21 engines active on vessels sailing in Asia and Europe. And that is where Alang Maritime can help out, especially when it comes to original engine components. As an independent Yanmar specialist, we have a large stock of Yanmar N21 original parts and we have access to unused surplus Yanmar N21 engine parts from decommissioned vessels and trusted local suppliers. We supply Yanmar N21 original engine parts with complete inspection reports, no lead time and our technical expertise. From crankshafts to o-rings, we have you covered. For your Yanmar N21 engine parts, you can reach out to Alang Maritime. 

Engine Configurations: 6N21L-EN, 6N21L-DN, 6N21L-SN, 6N21L-UN, 6N21L-EV, 6N21L-DV, 6N21L-SV, 621L-UV, 6N21L-GV, 6N21AL-EN, 6N21AL-DN, 6N21AL-SN, 6N21AL-UN, 6N21AL-EV, 6N21AL-DV, 6N21AL-SV, 6N21AL-UV, 6N21AL-GV, 8N21A-EN, 8N21A-DN, 8N21A-SN, 8N21A-UN, 8N21A-EV, 8N21A-DV, 8N21A-SV, 8N21A-UV, 8N21A-GV, 8N21L-EN, 8N21L-DN, 8N21L-SN, 8N21L-UN, 8N21L-EV, 8N21L-DV, 8N21L-SV, 821L-UV, 8N21L-GV, 8N21AL-EN, 8N21AL-DN, 8N21AL-SN, 8N21AL-UN, 8N21AL-EV, 8N21AL-DV, 8N21AL-SV, 8N21AL-UV, 8N21AL-GV

Supply scope of Alang Maritime for Yanmar N21 engines:

Complete engines, crankshafts, cylinder heads, cylinder liners, pistons, connecting rods, engine blocks, bedplates, exhaust valves, intake valves, valve seats, bearings, lube oil pumps, air starters, fuel injectors, plungers, piston rings and other consumables.

Alang Maritime is one of Southeast Asia’s premier suppliers of high quality second hand spare parts for two-stroke and four-stroke marine diesel engines. We can supply new (unused surplus) parts that are obtained from scrap vessels or shipowners’ surplus from cancelled projects. We can also supply reconditioned parts, as well as used parts that are offered with technical reports.

The brands that we supply parts for are:

Yanmar | Daihatsu | MaK | Wärtsilä | MAN B&W | Bergen | Sulzer | Pielstick | Caterpillar | Niigata | Hyundai-HiMSEN

Alang Maritime stocks new, reconditioned, as well as quality controlled used parts for marine diesel engines. Our strengths are our 30+ years of experience in the maritime industry, a huge stocking space of more than 3,500 sq. mt., an extensive stock of more than 25,000+ engine parts, our technical knowledge of marine diesel engines and our close proximity to the Indian ship recycling yard of Alang. That is why Alang Maritime is your premier solution for high quality marine diesel engine parts at an economical cost.