Overview
The ZF 4616.303.166 PULSE DISC is a critical speed-sensing component engineered specifically for the WG 65 Series transmission. This OEM genuine part, identified by SKU 4616.303.166, sits within the valve body or control module assembly, where it generates precise electrical pulses that the transmission control unit (TCU) uses to monitor output shaft rotation and shift timing. Without a properly functioning pulse disc, the transmission cannot accurately determine vehicle speed or execute gear changes, leading to erratic performance. This disc is often replaced during a full rebuild alongside the 4616101089: TRANSMISSION HOUSING to ensure signal integrity and structural alignment.
Symptoms of Failure
- Erratic shifting or gear hunting: A worn pulse disc sends inconsistent speed signals, causing the TCU to shift at incorrect RPMs or hunt between gears on level ground.
- Complete loss of speedometer function: When the disc fails to generate a signal, the vehicle may display zero speed while moving, triggering a limp-home mode.
- Delayed engagement or harsh shifts: Degraded pulse patterns force the transmission to rely on backup algorithms, resulting in jarring or delayed clutch applications.
- Intermittent transmission warning lights: The TCU logs fault codes for “implausible speed signal” or “output speed sensor circuit” when the disc wears unevenly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.303.166 |
| Material | High-temp polymer with ferromagnetic insert |
| Outer Diameter | ~85 mm |
| Inner Diameter | ~30 mm |
| Thickness | ~8 mm |
| Weight | ~0.12 kg |
| OEM Reference | ZF 4616.303.166 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This pulse disc is a direct fit for the ZF WG 65 Series transmission family. Based on its design and OEM numbering, it is also compatible with the following ZF models that share the same valve body architecture: WG180, WG200, WG210, and WG250. Always verify your transmission serial number before ordering. During installation, ensure the disc is secured with the correct fasteners; we recommend pairing it with 0636011038: HEXAGON SCREW and 0636011118: HEXAGON SCREW to prevent vibration loosening. For the housing cover, use 0636016015: HEXAGON SCREW to maintain proper clamping force.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101089 | TRANSMISSION HOUSING | Encloses and aligns all internal gear sets and valve body components |
| 0636011038 | HEXAGON SCREW | Secures valve body cover to housing |
| 0636011118 | HEXAGON SCREW | Fastens pulse disc mounting bracket |
| 0636016015 | HEXAGON SCREW | Holds output flange to shaft |
| 0631306085 | CYLINDRICAL PIN | Aligns valve body to housing during assembly |
| 0634313118 | O-RING | Seals oil passages between valve body and housing |
| 0636304019 | SCREW PLUG | Closes test ports in the valve body |
| 0634801152 | SEALING RING | Prevents fluid leaks at the pulse disc sensor bore |
| 0732611049 | FILTER INSERT | Traps debris before fluid enters the valve body |
| 0634303718 | O-RING | Seals the filter insert housing |
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