Overview
The ZF 4166.328.058 WASHER for Converter is a precision-engineered OEM genuine component designed to maintain critical axial clearance within the torque converter assembly of heavy-duty ZF transmissions. This hardened steel washer sits between the converter hub and the pump drive gear, ensuring proper oil flow and load distribution during high-torque operations. As part of the WG 150 Series, the SKU 4166.328.058 directly supports the structural integrity of the converter housing, working in concert with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205) to prevent metal-on-metal contact that can lead to catastrophic converter failure.
Symptoms of Failure
- Torque converter oil leaks at the bell housing – A worn 4166.328.058 washer allows excessive axial movement, breaking the seal between the converter and the GROOVED STUD (0631311009), leading to visible fluid seepage.
- Intermittent gear slipping under load – When the washer thickness degrades, converter clutch engagement pressure drops, causing hesitation or slip during uphill climbs or heavy hauling.
- Metallic grinding noise during converter lockup – Thinning of the washer permits the converter impeller to contact the housing, producing a distinct high-pitched grinding sound at steady highway speeds.
- Delayed engagement from Neutral to Drive – Reduced washer height alters the converter’s end-play, delaying hydraulic pressure buildup and causing a 2-3 second lag in gear engagement.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4166.328.058 |
| Material | Hardened Carbon Steel (C45E) |
| Outer Diameter | 58.0 mm |
| Inner Diameter | 32.0 mm |
| Thickness | 2.5 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4166.328.058 |
| Surface Finish | Ground & Phosphated |
Compatibility
This washer is primarily specified for the WG 150 Series transmissions, including models WG150, WG151, and WG152 used in municipal trucks and construction loaders. It also fits select variants of the WG180 and WG200 series where the converter housing uses the same 58mm outer diameter interface. Always verify the TYPE PLATE (0730365125) on your transmission to confirm the exact series designation before ordering. The washer is not compatible with WG 120 or WG 250 series due to different hub diameters.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Rear housing for output shaft support |
| 0730365125 | TYPE PLATE | Identification plate for model verification |
| 0631311009 | GROOVED STUD | Alignment stud for converter housing |
| 4642301168 | SCREEN SHEET | Oil filter screen for sump |
| 4642301169 | SCREEN SHEET | Fine mesh screen for valve body |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 4642301186 | SCREEN SHEET | Secondary oil strainer |
| 4644106231 | SHIFT SYSTEM | Hydraulic shift control unit |
| 4644306470 | GASKET | Seal between housing sections |
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