YC6JN series marine gas auxiliary engine is adapted to 50~100(kW) marine gas gensets.
Product Features
High reliability
-The key parts and components such as the engine block, cylinder head, crankshaft, bearing bush, and gearbox are the same as those of a diesel engine, making the product highly reliable.
Complete safety guarantee design
-Explosion-proof design of crankcase:A special explosion-proof valve is provided on the crankcase side to ensure that the crankcase pressure is within a reasonable range. Exhaust temperature monitoring design: An exhaust temperature sensor is designed to monitor the exhaust temperature of the engine, ensuring its safety of the engine. The water-cooled exhaust pipe ensures low thermal radiation, reduced compartment temperature, and good accessibility.
Advanced combustion control
-The turbocharged & intercooled lean combustion technology ensures efficient and clean combustion and good economy.
Techical Parameters
| Marine G-drive auxiliary engine |
| Model |
YC4D80NL-C21 |
YC4D70NL-C21 |
YC4D55NL-C21 |
| Type |
Vertical, in-line, water-cooled, four-stroke |
| Induction system |
Turbocharged & intercooled |
| Number of cylinders |
4 |
| Bore mm |
108 |
| Stroke mm |
115 |
| Displacement L |
4.21 |
| Rated power kW |
57 |
50 |
40 |
| Rated speed r/min |
1500 |
| Overload power kW |
62.7 |
55 |
44 |
| Overload speed r/min |
1500 |
| Average piston speed m/s |
5.75 |
| Mean effective pressure MPa |
1.08 |
0.95 |
0.76 |
| Firing order |
1-3-4-2 |
| Rotation |
Anticlockwise (facing the power output end) |
| Starting mode |
Electric start |
| Fuel |
LNG |
| Oil capacity L |
12 |
| Steady-state speed regulation % |
≤5 |
| Instantaneous speed regulation % |
≤15 |
| Emission |
China II marine engines |
| Diemension(Length × width × height) mm |
1040×790×1155(Diemension may vary with configuration.) |
| Dry weight kg |
520( may vary with configuration.) |
Detailed Photos
Related Products
YUCHAI MARINE LNG PROPULSION PRODUCT LINE
| Engine |
Rated power |
Rated speed |
Usage |
| KW |
PS |
r/min |
| YC8CAXN-CM |
1617 |
2200 |
1000 |
Propulsion |
| 1470 |
2000 |
1000 |
| 1323 |
1800 |
1000 |
| YC6CAXN-CM |
1103 |
1500 |
1000 |
| 1029 |
1400 |
1000 |
| YC6TF1000NL-C20 |
735 |
1000 |
1800 |
| YC6TF900NL-C20 |
660 |
900 |
1500 |
| YC6TF800N-C20 |
588 |
800 |
1500 |
| YC6TF680N-C20 |
500 |
680 |
1500 |
| YC6TF650N-C20 |
478 |
650 |
1500 |
| YC6TF610NL-C20 |
450 |
610 |
1200 |
| YC6TD545NL-C20 |
400 |
545 |
1500 |
| YC6TD450NL-C20 |
330 |
450 |
1500 |
| YC6TD410NL-C20 |
300 |
410 |
1500 |
YUCHAI MARINE LNG AUXILIARY PRODUCT LINE
| Engine |
Rated power |
Rated speed |
Usage |
| KW |
PS |
r/min |
| YC6CAXN-CD |
1029 |
1400 |
1000 |
Auxiliary |
| 956 |
1300 |
1000 |
| YC6TF900NL-C22 |
660 |
900 |
1500 |
| YC6TF800NL-C22 |
588 |
800 |
1500 |
| YC6TF680NL-C22 |
500 |
680 |
1500 |
| YC6TD545NL-C25 |
400 |
545 |
1500 |
| YC6TD490NL-C25 |
360 |
490 |
1500 |
| YC6TD410NL-C25 |
300 |
410 |
1500 |
| YC6J170NL-C20 |
125 |
170 |
1500 |
| YC6J135NL-C20 |
100 |
135 |
1500 |
| YC6J110NL-C20 |
80 |
110 |
1500 |
| YC4D80NL-C21 |
57 |
80 |
1500 |
| YC4D70NL-C21 |
50 |
70 |
1500 |
| YC4D50NL-C21 |
36 |
50 |
1500 |
Certifications
Company Profile
Founded in 1992, Guangxi Yuchai Machinery Co., Ltd. (Yuchai for short) is the first Chinese-foreign joint venture in the domestic industry listed abroad. Headquartered in Yulin, Guangxi Zhuang Autonomous Region, we have 11 subsidiaries and distribute our production bases in such areas as Guangxi, Jiangsu, Anhui and Shandong. As an internal combustion engine manufacturing base with a complete range of products in China and broad areas of application, we have an annual sales revenue exceeding CNY 20 billion and an annual engine output of 600,000 sets.
Driven by the mission of "realizing customer value and driving better lives", we share market, technology and product achievements and development opportunities with all partners, and coordinate with OEMs, dealers, service stations and suppliers to achieve win-win.
About Cheongfa
·Yanngjiang Cheongfa Marine & Genset Power Co., Ltd. is a premier manufacturer of diesel generator sets and gas-powered generator systems, specializing in R&D, production, and integrated power solutions.
·Our expertise covers end-to-end solutions: power system design, noise/vibration control, flue gas treatment, and waste heat recovery. Supported by advanced manufacturing and testing facilities, we deliver tailored genset room layouts, environmental compliance, and exhaust/intake systems.
·Cheongfa serves industries such as data centers, telecom, marine, oilfields, mili tary, utilities, and infrastructure. Clients include China Telecom, Tencent, and CNOOC, with projects across Southeast Asia, Africa, South America, and the Middle East.
·Committed to innovation and quality, we ensure excellence from design to after-sales support, backed by a structured management system covering production, sales, and engineering services.
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