Overview
The ZF 4646.162.416 OIL PIPE is a critical hydraulic conduit engineered specifically for the WG260 series transmission, though it also serves select variants in the WG 258, WG 308, and WG 310 series. This OEM genuine part channels pressurized transmission fluid directly from the pump assembly to the valve body and clutch packs, ensuring consistent lubrication and cooling under heavy-duty loads. As a precision-formed steel component, the SKU 4646.162.416 must maintain exact internal diameter tolerances to prevent pressure drops. It mounts internally within the main casing, often secured alongside the TRANSMISSION HOUSING and the HOUSING assembly, where it interfaces with multiple sealing surfaces.
Symptoms of Failure
- External oil leaks at pipe joints: Cracks or fatigue in the 4646.162.416 OIL PIPE often cause visible fluid seepage around the transmission bell housing or side cover, leading to low fluid levels.
- Erratic gear engagement or slipping: A compromised oil pipe reduces hydraulic pressure to clutch packs, resulting in delayed shifts or complete loss of drive in forward or reverse gears.
- Overheating transmission: Restricted oil flow through a damaged pipe starves the torque converter and cooler circuit, causing elevated operating temperatures and burnt fluid odor.
- Whining or cavitation noise: Air ingestion through a fractured pipe produces a high-pitched whine from the pump, especially during cold starts or under load.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.162.416 |
| Material | Seamless cold-drawn steel tube, zinc-plated |
| Overall Length | Approx. 320 mm |
| Tube Outer Diameter | 12 mm |
| Wall Thickness | 1.5 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 4646.162.416 |
| Sealing Type | O-ring groove ends (O-rings sold separately) |
Compatibility
This oil pipe is primarily validated for the ZF WG260 series, including WG260-1 and WG260-2 variants. It also fits select builds within the WG 258, WG 308, and WG 310 series where the hydraulic routing matches. The part is not compatible with WG180 or WG200 series due to different pump-to-valve body distances. Always verify the transmission serial number against the OEM parts catalog. When installing, use new HEXAGON SCREW and CAP SCREW fasteners to ensure proper clamping force on the pipe brackets.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101156 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating and hydraulic components |
| 4646301327 | HOUSING | Secondary housing for valve body and oil channel routing |
| 0636015304 | HEXAGON SCREW | M8 fastener for securing oil pipe brackets to housing |
| 0636101828 | CAP SCREW | M10 bolt for transmission housing flange connections |
| 4646301102 | COVER SHEET | Protective plate over oil pipe routing channel |
| 4646301285 | COVER SHEET | Alternate cover sheet for different housing variants |
| 0730365190 | TYPE PLATE | Identification plate riveted to housing |
| 0631311009 | GROOVED STUD | Alignment stud for oil pipe bracket positioning |
| 0636101193 | CAP SCREW | M8 cap screw for cover sheet retention |
| 0636010179 | HEXAGON SCREW | M6 hex screw for valve body mounting |
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