Overview
The ZF 4642.121.204 OIL PIPE is a precision-engineered fluid conduit designed specifically for the WG 150 series transmission. This OEM genuine part ensures consistent lubrication and hydraulic pressure delivery to critical internal components, including the clutch packs and valve body. Positioned within the transmission’s oil circuit, the pipe directs ATF (Automatic Transmission Fluid) under high pressure to maintain thermal stability and reduce friction. The SKU 4642.121.204 is a direct replacement for worn or damaged lines, restoring proper fluid flow and preventing contamination. For optimal sealing, this pipe integrates with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to form a leak-proof assembly.
Symptoms of Failure
- Transmission fluid leaks near the oil pan or bell housing: A cracked or corroded 4642.121.204 oil pipe often causes visible drips, leading to low fluid levels and overheating.
- Delayed or harsh gear engagement: Insufficient hydraulic pressure from a blocked pipe results in slipping between shifts, especially under load.
- Whining or humming noise during acceleration: Air entering the system through a damaged pipe creates cavitation, producing audible noise from the pump.
- Burning smell or erratic shifting: Starved lubrication accelerates wear on clutches and bands, causing friction material to burn and shift quality to degrade.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4642.121.204 |
| Material | Steel with anti-corrosion coating |
| Length | Approx. 280 mm |
| Inner Diameter | 8 mm |
| Outer Diameter | 12 mm |
| Weight | 0.15 kg |
| OEM Reference | ZF 4642.121.204 |
| Torque Spec | 25 Nm (connection nuts) |
Compatibility
This oil pipe is primarily engineered for the ZF WG 150 series, but it also fits select variants of the WG 180 and WG 200 transmissions due to shared oil circuit architecture. Always verify the part number 4642.121.204 against your transmission’s serial plate. The 0730365125: TYPE PLATE provides exact model identification, while the 0631311009: GROOVED STUD secures the pipe to the housing. For heavy-duty applications, cross-reference with WG 250 series if the oil gallery layout matches.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Encloses gear train and oil passages |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing for valve body |
| 0730365125 | TYPE PLATE | Identifies transmission model and specs |
| 0631311009 | GROOVED STUD | Secures oil pipe to housing |
| 4642301168 | SCREEN SHEET | Filters debris from oil flow |
| 4642301169 | SCREEN SHEET | Secondary filtration mesh |
| 0636100621 | HEXAGON SCREW | Fastens pipe brackets |
| 4642301186 | SCREEN SHEET | Fine-mesh oil strainer |
| 4644106231 | SHIFT SYSTEM | Controls gear selection |
| 4644306470 | GASKET | Seals pipe-to-housing connection |
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