YC6T660L-D20 Yuchai Diesel Engine
YC6T Series · YC6T系列
The YC6T660L-D20 is a 6-cylinder Inline-6 diesel engine from Yuchai's YC6T series, rated at 441 kW prime power for generator-drive applications. With 16.35 L displacement and turbocharged aspiration, it delivers reliable power for diesel gensets in the 401–485 kW range.
This is a generator-drive (G-drive) rating, not a truck rating: the block, the governor and the cooling package are set up to hold a steady speed under a steady load, which is what a 50 Hz or 60 Hz alternator needs. The direct injection fuel system on this model is what keeps the frequency steady when a large motor starts across the line.
We couple it to our own TFW brushless alternator, mount it on a common base frame and run the finished set on our load bank to 110% before it is packed. If you are comparing an engine, compare the prime figure, the torque at the alternator's rated speed, and the after-sales cover for wear parts — the Yuchai vs Cummins vs Perkins comparison walks through that comparison.
Specifications
| Model | YC6T660L-D20 |
|---|---|
| Series | YC6T Series |
| Prime Power | 441 kW |
| Standby Power (ESP) | 485 kW |
| Cylinders | 6 · Inline-6 |
| Displacement | 16.35 L |
| Bore × Stroke | — |
| Aspiration | Turbocharged |
| Rated Speed | 1500 RPM |
| Fuel System | Direct injection |
| Emission Standard | Non-road T2 |
| Compression Ratio | — |
| Dry Weight | — |
| Dimensions | — |
| Oil Capacity | — |
| Cooling Type | Water-cooled |
| Start Method | Electric start |
| Rotation | CCW (facing power output end) |
Gensets Using This Engine
The YC6T660L-D20 powers the following Yuchai diesel generator sets:
Recommended Spare Parts
Maintenance Intervals
Overhaul Interval
5000 hours
Frequently Asked Questions
What is the power rating of the YC6T660L-D20 Yuchai engine?▼
441 kW prime and 485 kW standby (ESP) at 1500 rpm, from a 6-cylinder Inline-6 block of 16.35 L. Prime is the continuous duty figure; standby is for outage backup only. Both come from Yuchai's own rating table for this model, and we confirm which one your load needs before matching an alternator.
Which Zhiqiang generator sets use the YC6T660L-D20 engine?▼
In the current catalogue the YC6T660L-D20 powers TFW-450 (450 kW). Other ratings are built to order on the same block — send the load profile and we will size the set around this engine or the next size in the YC6T family.
What emission standard does the YC6T660L-D20 meet?▼
This engine is declared Non-road T2 under China GB 20891. The tier follows the model suffix: a -D2x engine is non-road T2, -D3x is non-road T3 and -D4x is non-road T4. The emission declaration and the engine test file are issued per order, so your customs broker or consultant can review them against the destination market before the set ships.
Get a technical quotation for your project
Send your load, country and frequency requirements — an engineer will confirm configuration, pricing and shipping.