Overview
The ZF 4166.035.165 CONVERTER Torque Converter Assembly is a critical hydraulic component that transfers and multiplies engine torque to the transmission input shaft within the WG 200 Series. This complete unit replaces the original torque converter, ensuring smooth power delivery and efficient lock-up operation. The SKU 4166.035.165 is a direct-fit assembly designed to restore driveline performance in heavy-duty ZF transmissions.
Symptoms of Failure
- Torque converter shudder or vibration during acceleration, especially at low speeds, indicating worn clutch friction material or damaged stator bearings.
- Transmission fluid overheating and darkening, often caused by a failing converter that cannot properly regulate hydraulic pressure.
- Delayed or harsh engagement when shifting from Park to Drive or Reverse, a classic sign of a failing torque converter lock-up clutch.
- Whining or grinding noise from the bell housing area, suggesting internal bearing failure or impeller damage.
Technical Specifications
| Part Number | 4166.035.165 |
| Type | Complete Torque Converter Assembly |
| Diameter | Approx. 340 mm (13.4 in) |
| Weight | ~18.5 kg (40.8 lbs) |
| Material | High-strength steel housing with aluminum impeller |
| OEM Reference | ZF 4166.035.165 |
| Lock-up Clutch | Yes, hydraulic lock-up with damper springs |
Compatibility
This torque converter assembly is engineered for the ZF WG 200 Series transmissions, including models WG180, WG200, and WG210. It is also compatible with select ZF Ecomat 4HP and 6HP variants used in municipal buses, construction equipment, and heavy trucks. Always verify your transmission model before installation.
During replacement, inspect the 4644101216 TRANSMISSION HOUSING and 4644301223 TRANSMISSION HOUSING for cracks or wear. The 0730365067 TYPE PLATE provides critical identification data, while the 0631311009 GROOVED STUD secures the converter to the flexplate. For a complete rebuild, also consider the 4644303060 COVER PLATE and 4644303061 COVER PLATE to seal the housing, along with the 0634306525 O-RING and 0636305026 SCREW PLUG for leak prevention. The 4644301279 SCREEN SHEET filters debris, and the 4644301088 SEALING CAP protects the converter hub.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301223 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Fastener for converter-to-flexplate mount |
| 4644303060 | COVER PLATE | Seals the transmission housing opening |
| 4644303061 | COVER PLATE | Alternate cover plate for access ports |
| 0634306525 | O-RING | Hydraulic seal for converter circuit |
| 0636305026 | SCREW PLUG | Closes fluid passages during service |
| 4644301279 | SCREEN SHEET | Filters contaminants from transmission fluid |
| 4644301088 | SEALING CAP | Protects converter hub during transport |
