Overview
The ZF 4166.039.087 CONVERTER Torque Converter Assembly is a critical hydraulic component responsible for transferring engine torque to the transmission input shaft while providing torque multiplication and fluid coupling in ZF WG 65 Series drivetrains. This complete unit sits between the engine flywheel and the transmission pump, converting rotational energy into hydraulic power. The SKU 4166.039.087 is engineered as a direct replacement assembly, ensuring precise lock-up clutch engagement and smooth power delivery under heavy-duty industrial loads.
Symptoms of Failure
- Torque converter shudder or vibration during acceleration — Worn internal clutches or damaged stator vanes cause inconsistent hydraulic pressure, leading to noticeable shaking when the converter locks up.
- Transmission overheating and fluid darkening — A failing converter generates excessive heat due to internal slippage, often accompanied by burnt-smelling transmission fluid.
- Delayed or harsh gear engagement — When the converter fails to build proper hydraulic pressure, you may experience a lag between shifting and actual gear engagement, particularly from neutral to drive.
- Visible fluid leaks near the bell housing — Worn seals or cracks in the converter housing allow transmission fluid to escape, leaving puddles under the vehicle and reducing system pressure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4166.039.087 |
| Assembly Type | Complete Torque Converter Unit |
| Outer Diameter | ~340 mm (estimated) |
| Weight | ~18.5 kg (estimated) |
| Housing Material | High-strength cast iron |
| Impeller Material | Heat-treated steel |
| OEM Reference | ZF 4166.039.087 |
| Seal Type | Viton O-ring compatible |
Compatibility
This torque converter assembly is designed for the ZF WG 65 Series transmission family, which includes models such as the WG180, WG200, and WG250. It is also compatible with select WG 65 variants used in construction equipment, agricultural tractors, and material handling machinery. Always verify your transmission model and serial number before installation.
During replacement, it is essential to inspect adjacent components. The TRANSMISSION HOUSING must be free of cracks or warping to ensure proper converter alignment. Secure the assembly using the correct fasteners: the HEXAGON SCREW (M10 x 30) for bell housing attachment, the HEXAGON SCREW (M12 x 35) for pump mounting, and the HEXAGON SCREW (M16 x 50) for flywheel connection. All bolts must be torqued to factory specifications to prevent vibration loosening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses and supports torque converter assembly |
| 0636011038 | HEXAGON SCREW | M10 bolt for housing-to-converter fastening |
| 0636011118 | HEXAGON SCREW | M12 bolt for pump mounting |
| 0636016015 | HEXAGON SCREW | M16 bolt for flywheel connection |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for converter housing |
| 0634313118 | O-RING | Seals converter-to-housing interface |
| 0636304019 | SCREW PLUG | Drain plug for converter fluid |
| 0634801152 | SEALING RING | Prevents fluid leaks at plug point |
| 0732611049 | FILTER INSERT | Traps debris in converter circuit |
| 0634303718 | O-RING | Secondary seal for converter cover |
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