Overview
The ZF 4166.336.215 PLATE PISTON is a critical hydraulic actuation component engineered for the WG series of heavy-duty automatic transmissions. Positioned within the clutch pack assembly, this OEM genuine part converts hydraulic pressure into mechanical force, engaging and disengaging gear sets with precision. The SKU 4166.336.215 is manufactured to ZF’s exacting tolerances, ensuring consistent clamping force and minimal fluid bypass during high-torque operations. This plate piston works in concert with the TRANSMISSION HOUSING (4616101065) to maintain structural integrity under extreme loads.
Symptoms of Failure
- Delayed or harsh gear engagement: When the plate piston loses sealing capability, hydraulic pressure drops, causing noticeable lag or jarring shifts during acceleration.
- Internal transmission fluid leaks: Worn piston seals allow ATF to bypass, leading to low fluid levels and puddling near the bell housing or pan gasket.
- Intermittent gear slipping under load: A fatigued plate piston cannot maintain clutch pack clamping force, resulting in RPM flare without corresponding vehicle speed increase.
- Erratic shift patterns: The transmission may hunt between gears or fail to hold a selected gear due to inconsistent hydraulic pressure regulation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.336.215 |
| Material | High-strength aluminum alloy with hardened steel insert |
| Outer Diameter | 168 mm |
| Inner Diameter | 95 mm |
| Thickness | 22 mm |
| Weight | 0.85 kg |
| OEM Reference | ZF 4166.336.215 |
| Seal Compatibility | Nitrile rubber (NBR) or Viton |
Compatibility
This plate piston is designed for ZF WG series transmissions, specifically the WG65, WG150, WG180, WG200, and WG201 models. It is a direct-fit replacement for units manufactured between 2005 and 2020. The part interfaces with the HEXAGON SCREW (0636011038) and HEXAGON SCREW (0636011118) for secure mounting to the valve body. Additionally, the HEXAGON SCREW (0636016015) is used to fasten the piston retainer plate. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Encloses and supports all internal gear and clutch assemblies |
| 0636011038 | HEXAGON SCREW | Secures valve body and piston components |
| 0636011118 | HEXAGON SCREW | Fastens clutch pack retainer plates |
| 0636016015 | HEXAGON SCREW | Mounts piston guide and spring assembly |
| 0631306085 | CYLINDRICAL PIN | Aligns piston and valve body during assembly |
| 0634313118 | O-RING | Seals piston bore to prevent fluid leakage |
| 0636304019 | SCREW PLUG | Closes hydraulic test ports on the housing |
| 0634801152 | SEALING RING | Prevents oil seepage at threaded connections |
| 0732611049 | FILTER INSERT | Traps debris in the hydraulic circuit |
| 0634303718 | O-RING | Provides secondary seal for piston return spring |
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