Overview
The ZF 4166.041.021 CONVERTER Torque Converter Assembly is a critical hydraulic coupling component designed for the WG 65 Series transmission family. Positioned between the engine flywheel and the transmission input shaft, this complete unit multiplies engine torque and transfers rotational power through fluid dynamics, enabling smooth vehicle acceleration and load handling. The SKU 4166.041.021 is a direct replacement assembly, ensuring precise fitment within the bell housing area. During installation, the torque converter interfaces directly with the 4616101116: TRANSMISSION HOUSING and is secured by the 0636011118: HEXAGON SCREW fasteners, which must be torqued to specification for optimal alignment.
Symptoms of Failure
When the ZF 4166.041.021 torque converter wears out, operators typically encounter these specific failure indicators:
- Shuddering or vibration during gear engagement – A common sign of worn internal clutch friction material or degraded stator bearings, often searched as “torque converter shudder when accelerating.”
- Transmission fluid overheating and darkening – Caused by internal slippage, leading to “torque converter overheating symptoms” in heavy-duty applications.
- Delayed or harsh shifting – The converter fails to lock up properly, resulting in “ZF transmission slipping between gears” complaints.
- Whining or grinding noise from the bell housing – Indicates damaged needle bearings or impeller wear, frequently reported as “torque converter noise at idle.”
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4166.041.021 |
| Assembly Type | Complete Torque Converter Unit |
| Diameter (Approx.) | 385 mm |
| Weight | 22.5 kg (49.6 lbs) |
| Housing Material | High-Strength Steel / Aluminum Composite |
| OEM Reference | ZF 4166 041 021 |
| Stator Type | Sprag Clutch with Needle Bearings |
| Fluid Capacity | 2.8 Liters (Approx.) |
Compatibility
This torque converter assembly is engineered for the ZF WG 65 Series transmission family. It is compatible with the following models based on the WG platform: WG180, WG200, WG210, and WG250. These transmissions are commonly found in mid-range to heavy-duty commercial vehicles, construction equipment, and municipal trucks. The converter mounts directly to the 4616301307: HOUSING and the 4616301309: HOUSING components, which form the outer casing of the transmission assembly. Always verify the flywheel bolt pattern and pilot diameter before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101116 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 0636011118 | HEXAGON SCREW | Fastener for housing assembly |
| 4616301307 | HOUSING | Intermediate housing section |
| 4616301309 | HOUSING | Rear housing component |
| 0636011038 | HEXAGON SCREW | Mounting bolt for converter cover |
| 0636016015 | HEXAGON SCREW | High-torque fastener for bell housing |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0634313118 | O-RING | Seal between converter and housing |
| 0636304019 | SCREW PLUG | Drain plug for torque converter |
| 0634801152 | SEALING RING | Copper gasket for plug sealing |
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