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| Engine Model | YC4D120-21(D1204) |
| Rated Power | 120 HP (90 kW) @ 2800 rpm |
| Rated Torque | 420 N·m @ 1600-1900 rpm |
| Emission Standard | Euro II / China II |
| Application Field | Light-duty/medium-duty trucks, low-tonnage medium trucks, small construction machinery |
| Core Advantages | Low fuel consumption (≤205g/kW·h), high reliability (alloy cast cylinder block), easy maintenance (universal parts), turbocharged intercooled power system |
Power, Precision, Partnership: The Genuine Yuchai Ecosystem
Choose the authentic power legacy of Yuchai. Our 100% genuine OEM parts for the YC4D120-21(D1204) engine are designed to restore its original horsepower, torque, and efficiency, delivering the true Yuchai DNA.
Uncompromised Quality, Forged on the Original Line
Every part is produced to identical specifications under the stringent Yuchai Quality Control System (QCS), guaranteeing perfect fitment, durability, and seamless integration to preserve engine value.
1. D0899-1009000/01 Oil Sump Assembly
| No. | Part No. | Name | Qty. | Remark |
|---|---|---|---|---|
| 1 | D30-1009011C | Oil sump gasket | 1 | Easy Wear Part |
| 2 | D0305-1009040C | Oil sump parts | 1 | - |
| 3 | D30-1009102A | Washer | 7 | - |
| 4 | Q40308 | Washer 8 | 22 | - |
| 5 | Q/YC1820820 | Bolt M8X20 | 22 | - |
| 6 | 6105Q-3509013 | Washer | 15 | - |
| 7 | Q/YC149-27 | Compound sealing washer 27 | 1 | Easy Wear Part |
| 8 | 6105Q-1009032A | Oil drain plug electromagnetism | 1 | - |
| 9 | 6105Q-1009031C | Oil drain plug | 1 | - |
2. D30-1010000/05 Oil Strainer Assembly
| No. | Part No. | Name | Qty. | Remark |
|---|---|---|---|---|
| 1 | 6105QA-1010130B | Filter screen assembly | 1 | - |
| 2 | D30-1010010A | Oil suction pipe welded unit | 1 | - |
| 3 | Q150B0820TF2 | Bolt M8x20 | 1 | - |
| 4 | Q40308 | Washer 8 | 3 | - |
| 5 | Q150B0850TF2 | Bolt M8x50 | 2 | - |
| 6 | D30-1010050A | Washer combination unit | 1 | - |
3. D30-1011000A/07 Oil Pump Assembly
| No. | Part No. | Name | Qty. | Remark |
|---|---|---|---|---|
| 1 | Q/YC207-0828 | Bolt M8X28 | 2 | - |
| 2 | Q/YC207-0840 | Bolt M8X40 | 3 | - |
| 3 | D30-1011100 | Oil pump | 1 | - |
| 4 | D30-1011041B | Gasket plate | 1 | Easy Wear Part |
4. B8800-1012000/01 Oil Filter Assembly
| No. | Part No. | Name | Qty. | Remark |
|---|---|---|---|---|
| 1 | Q150B10100 | Bolt | 1 | - |
| 2 | Q150B1080 | Bolt | 1 | - |
| 3 | Q40310 | Washer 10 | 2 | Easy Wear Part |
| 4 | Q40110 | Washer 10 | 2 | Easy Wear Part |
| 5 | D30-1012010B | Oil filter | 1 | Easy Wear Part |
| 6 | 6105Q-1012002 | Oil filter gasket | 1 | Easy Wear Part |
5. D1208-1013000/02 Oil Cooler Assembly
| No. | Part No. | Name | Qty. | Remark |
|---|---|---|---|---|
| 1 | D30-1013012A | Oil cooler cover gasket | 1 | Easy Wear Part |
| 2 | D30-1013100 | Oil cooler | 1 | - |
| 3 | Q150B1070 | Bolt M10X70 | 1 | - |
| 4 | Q40110 | Washer 10 | 10 | - |
| 5 | Q40310 | Washer 10 | 10 | - |
| 6 | Q150B1065 | Bolt M10X65 | 1 | - |
| 7 | Q150B1035 | Bolt M10x35 | 2 | - |
| 8 | D30-1012001A | Oil exhaust guide pipe | 1 | - |
| 9 | Q150B1045 | Bolt M10X45 | 4 | - |
| 10 | Q150B10150 | Bolt M10X150 | 2 | - |
