Marine Engine
Weichai M21 Marine Diesel Engine (803–1341 hp)
Weichai M21 12.54 L 6-cylinder diesel engine, 803–1341 hp (599–1000 kW), 14 ratings for marine work. Each unit nameplate-verified.
Specifications
- Engine Model
- M21
- Displacement
- 12.54 L
- Cylinders & Configuration
- Inline 6, 4-cycle
- Rated Power Range
- 599–1000 kW (803–1341 hp) @ 2300 rpm
- Aspiration
- Dual-stage Turbocharged Aftercooled
- Applications
- Marine
- Documentation
- Nameplate verification + load-test record per serial number
Overview
The Weichai M21 is a 12.54 L 6-cylinder Weichai diesel engine supplied in 14 factory ratings from 803 hp (599 kW) to 1341 hp (1000 kW). Every rating listed on this page is a complete engine for marine duty, not a generator set, and each unit ships with its serial number recorded against the specification sheet that applies to it.
Ratings in this family differ in rated speed, peak torque and emissions tier rather than in displacement or cylinder count, so the choice between them is a duty-matching question. The specifications panel and the per-rating entries on this page are generated from the same source data, so a rating quoted here can be matched directly against a delivery document.
Specifications
The specifications panel lists the family-level values that are common to every M21 rating, including the 12.54 L displacement and the inline 6-cylinder layout. Ratings that share displacement and cylinder count but differ in output are listed individually in the model selection section.
Model Selection: M21 Ratings
Each entry in this section is one rating of the Weichai M21. The rated power is the output at the stated speed; the peak torque figure is the value the rating develops at the lower speed shown, which is what normally decides whether a rating suits a given machine. Each rating carries a stable anchor, so a single rating can be linked or quoted directly.
6M21V815-23E200
6M21V815-23E200 — rated 599 kW (803 hp) at 2300 rpm.
6M21Y815-23E201
6M21Y815-23E201 — rated 599 kW (803 hp) at 2300 rpm.
6M21Y900-23E200
6M21Y900-23E200 — rated 662 kW (888 hp) at 2300 rpm.
6M21Y900-23E201
6M21Y900-23E201 — rated 662 kW (888 hp) at 2300 rpm.
6M21Y1000-23E200
6M21Y1000-23E200 — rated 735 kW (986 hp) at 2300 rpm.
6M21Y1000-23E201
6M21Y1000-23E201 — rated 735 kW (986 hp) at 2300 rpm.
8M21Y1000-23E200
8M21Y1000-23E200 — rated 735 kW (986 hp) at 2300 rpm.
8M21Y1000-23E201
8M21Y1000-23E201 — rated 735 kW (986 hp) at 2300 rpm.
8M21Y1100-23E200
8M21Y1100-23E200 — rated 809 kW (1085 hp) at 2300 rpm.
8M21Y1100-23E201
8M21Y1100-23E201 — rated 809 kW (1085 hp) at 2300 rpm.
8M21Y1250-23E200
8M21Y1250-23E200 — rated 919 kW (1232 hp) at 2300 rpm.
8M21V1250-23E201
8M21V1250-23E201 — rated 919 kW (1232 hp) at 2300 rpm.
8M21Y1360-23E200
8M21Y1360-23E200 — rated 1000 kW (1341 hp) at 2300 rpm.
8M21Y1360-23E201
8M21Y1360-23E201 — rated 1000 kW (1341 hp) at 2300 rpm.
Applications
M21 engines in this family are normally specified for marine work.
Marine: ratings are quoted against the propulsion or auxiliary duty required, with the gearbox ratio and the duty classification taken into account.
Verification, Documentation and Ordering
Each engine is offered with nameplate verification + load-test record per serial number. That means the model and rating printed on the engine nameplate can be checked against the record issued for that serial number before shipment, which is the point most buyers of re-rated or re-exported engines want covered.
To receive a quotation, send the exact rating from the matrix above (for example 8M21Y1360-23E201), the machine or application it will drive, the quantity, and the destination port. If the rating you need is not listed, send the model and the required output and we will confirm whether it belongs to this family or to a neighbouring one.
Buyer tip: Send your M21 specification, quantity and destination port for a verified quotation and lead time.
Frequently Asked Questions
What is the power range of the M21?
The 14 ratings listed on this page run from 803 hp (599 kW) to 1341 hp (1000 kW).
What displacement and cylinder count does the M21 use?
Every rating in this family shares the same 12.54 L displacement and inline 6-cylinder, 4-cycle configuration. Ratings differ in output, rated speed and emissions tier rather than in the base engine.
What is the difference between 8M21Y1360-23E200 and 8M21Y1360-23E201?
8M21Y1360-23E200 is rated 1000 kW (1341 hp) at 2300 rpm, while 8M21Y1360-23E201 is rated 1000 kW (1341 hp) at 2300 rpm. They use the same base engine; the higher rating is the one to specify when the driven load needs the extra torque at the lower speed.
How is a M21 rating ordered?
Send the exact rating shown in the model selection table, the application it will drive, the quantity and the destination port. The engine is then quoted against that rating and confirmed against its nameplate and load-test record.
