Overview
The ZF 4166.030.066 CONVERTER Torque Converter Assembly is a critical hydraulic coupling unit positioned between the engine flywheel and the transmission input shaft within the WG 150 Series drivetrain. This complete unit, identified by SKU 4166.030.066, multiplies engine torque during low-speed operation and provides a fluid coupling at higher speeds, ensuring smooth power delivery and protecting the gear train from shock loads. It integrates directly with the 4642101109 TRANSMISSION HOUSING and the 4642301205 TRANSMISSION HOUSING to form a sealed, high-pressure fluid circuit essential for clutch engagement and vehicle launch.
Symptoms of Failure
- Shuddering or vibration during acceleration: A worn torque converter lock-up clutch or damaged stator bearings cause noticeable shuddering when the converter attempts to lock, often described as a “judder” at highway speeds.
- Transmission fluid overheating and darkening: Internal stator failure or a seized one-way clutch generates excessive heat, leading to burnt-smelling, dark fluid and potential seal degradation around the 0730365125 TYPE PLATE.
- Delayed or harsh engagement from Park to Drive: A failing turbine hub or damaged pump drive splines cause a significant lag (2-4 seconds) before the vehicle moves, often accompanied by a loud clunk.
- Fluid leaks from the bell housing area: Worn pump seals or a cracked converter hub allow transmission fluid to escape, pooling near the 0631311009 GROOVED STUD mounting points.
Technical Specifications
| Part Number | 4166.030.066 |
| Type | Single-Stage, 3-Element Torque Converter (with Lock-Up Clutch) |
| Overall Diameter | 340 mm (13.4 in) |
| Length (Mounting Face to Pilot) | 185 mm (7.3 in) |
| Weight | 18.5 kg (40.8 lbs) |
| Housing Material | High-Strength Aluminum Alloy (A356-T6) |
| Impeller & Turbine Material | Stamped Steel with Heat-Treated Fins |
| OEM Reference | ZF 4166.030.066 (Direct Replacement) |
| Max Input Torque | 1,200 Nm (885 lb-ft) |
| Pilot Diameter | 52.0 mm |
| Bolt Circle | 8 x M10 x 1.5 on 295 mm PCD |
Compatibility
This converter assembly is engineered primarily for the ZF WG 150 Series transmissions. It is also compatible with the following ZF model families when used with the correct flexplate and housing adapter: WG 180, WG 200, and select Ecomat 4HP variants (specifically those with a 340mm converter bell). Always verify the pilot bore depth and flexplate bolt pattern against your existing unit. The converter interfaces with the 4642101109 TRANSMISSION HOUSING and 4642301205 TRANSMISSION HOUSING to ensure correct alignment with the oil pump drive.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses gear train and supports converter assembly |
| 4642301205 | TRANSMISSION HOUSING | Rear housing section for output shaft support |
| 0730365125 | TYPE PLATE | Identification plate with serial number and specs |
| 0631311009 | GROOVED STUD | Alignment dowel for housing-to-converter positioning |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4642301169 | SCREEN SHEET | Secondary filter screen for valve body protection |
| 0636100621 | HEXAGON SCREW | M10 bolt for housing flange fastening |
| 4642301186 | SCREEN SHEET | Coarse debris screen for sump area |
| 4644106300 | SHIFT SYSTEM | Electro-hydraulic control unit for gear selection |
| 4644306500 | COVER PLATE | Sealing cover for shift system access port |
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