Overview
The ZF 4166.337.115 WASHER for Converter is a precision-engineered OEM genuine component designed to maintain the critical axial clearance within the torque converter assembly of heavy-duty ZF transmissions. This hardened steel washer acts as a load-bearing spacer, preventing metal-to-metal contact between rotating converter elements and the stationary housing. As part of the WG 65 Series, this washer ensures consistent hydraulic pressure and torque multiplication under extreme operating conditions. The SKU 4166.337.115 is a direct replacement for the original factory part, guaranteeing exact fit and material integrity. When installed alongside the 4616105402 OUTPUT and the 4005303005 OUTPUT FLANGE, this washer prevents premature wear that can compromise driveline alignment.
Symptoms of Failure
- Torque converter shudder or vibration during lock-up: A worn 4166.337.115 washer allows excessive axial play, causing the converter clutch to engage unevenly. This manifests as a low-frequency shudder at highway speeds, often misdiagnosed as a driveline imbalance.
- Transmission fluid contamination with metallic particles: As the washer surface degrades, microscopic steel particles enter the hydraulic circuit. This “converter wear debris” can clog the valve body and reduce line pressure, leading to delayed shifts.
- Intermittent loss of torque converter lock-up: When the washer thickness falls below specification, the converter piston cannot fully compress against the cover. This results in a “slipping” sensation under load, particularly when climbing grades or towing heavy loads.
- Audible rattling from the bell housing area: A severely worn washer creates a loose fit between the converter hub and the pump drive. This produces a distinct metallic rattle at idle, which disappears when the transmission is placed in gear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4166.337.115 |
| Material | Hardened Carbon Steel (DIN 1.3505 equivalent) |
| Outer Diameter | 115.0 mm |
| Inner Diameter | 85.0 mm |
| Thickness | 3.2 mm |
| Surface Hardness | HRC 58-62 |
| Weight | 0.12 kg |
| OEM Reference | ZF 4166.337.115 |
Compatibility
This washer is engineered for ZF WG 65 Series transmissions, specifically the WG180, WG200, and WG210 models used in municipal buses, fire trucks, and heavy construction equipment. It also fits select ZF 6HP and 8HP automatic transmissions that share the same converter hub geometry. The part is designed to work with the 4616101119 TRANSMISSION HOUSING and is secured using the 0636011038 HEXAGON SCREW. Always verify your transmission serial number before ordering, as converter stack height tolerances vary between production years.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from converter to driveline |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to driveshaft |
| 4616101119 | TRANSMISSION HOUSING | Encloses gear train and converter assembly |
| 0636011038 | HEXAGON SCREW | Secures housing and flange components |
| 0636011118 | HEXAGON SCREW | Fastens converter cover to turbine |
| 0636016015 | HEXAGON SCREW | Mounts output flange to shaft |
| 0631306085 | CYLINDRICAL PIN | Aligns housing and pump body |
| 0634313118 | O-RING | Seals converter hub to pump |
| 0636304019 | SCREW PLUG | Closes oil passages in housing |
| 0634801152 | SEALING RING | Prevents fluid leakage at output shaft |
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