Overview
The ZF 0501.320.416 SCREW PLUG is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part serves as a critical closure point within the transmission housing, preventing fluid loss and maintaining internal pressure integrity. The SKU 0501.320.416 is installed directly into the 4108101158: HOUSING assembly, where it seals access ports used during maintenance or assembly. Without this screw plug, the transmission cannot maintain proper lubrication levels, risking premature wear to internal components like the 0735370298: ROLLER BEARING.
Symptoms of Failure
- Transmission fluid seepage around the drain or fill port: A worn or cross-threaded 0501.320.416 screw plug allows oil to escape, often leaving visible drips under the vehicle. This is a common long-tail search query for “ZF WG100 oil leak at plug.”
- Inconsistent gear engagement or slipping: When the screw plug fails to seal, low fluid levels cause hydraulic pressure drops, leading to delayed shifts or clutch slip during acceleration.
- Contaminated transmission fluid: A loose or damaged plug permits dirt and moisture ingress, which accelerates wear on the 0501215907: MOTOR and valve body components.
- Audible whining or grinding noises: Insufficient lubrication from a leaking plug stresses the 0501320268: COVER and planetary gear sets, producing metallic sounds during operation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0501.320.416 |
| Thread Size | M18 x 1.5 (estimated) |
| Head Type | Hexagon socket (6 mm) |
| Material | Steel, zinc-plated |
| Sealing Method | Copper washer (integrated) |
| Weight | 0.04 kg (0.09 lbs) |
| OEM Reference | ZF 0501.320.416 |
| Torque Spec | 25 Nm (18.4 ft-lbs) |
Compatibility
This screw plug is specifically engineered for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 variants where the same thread pattern is used for oil drain or fill ports. Always verify the thread pitch against your existing plug before installation. The 0501.320.416 is not interchangeable with metric plugs from other manufacturers due to its unique sealing profile.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101158 | HOUSING | Main transmission casing that houses all internal components |
| 0501215907 | MOTOR | Hydraulic pump motor for clutch actuation |
| 0501320268 | COVER | End cover sealing the transmission sump area |
| 0735370298 | ROLLER BEARING | Supports rotating shafts within the gear train |
| 0501317874 | HOUSING | Secondary housing for valve body assembly |
| 0501317875 | ROLLER | Needle roller for planetary gear support |
| 0501213227 | PISTON | Hydraulic piston for clutch pack engagement |
| 0501317876 | COMPRESSION SPRING | Returns piston to neutral position |
| 0501314823 | BUSH | Wear-resistant bushing for shift linkage |
| 0501314929 | CAM DISC | Controls shift timing in the valve body |
