178-6633 and 485-4894belong to different engine entries
The 320D KGF / GDPwater-pump entry is178-6633. The 320D2 DNS / ZCS / RARrepair record uses485-4894. The latter is a legacyCatnumber now discontinued in the genuine catalog; replacement purchases retain the old number and selected engine configuration.
| Part number | Engine / machine entry | Technical identity |
|---|---|---|
| 178-6633 | 320D KGF / GDP | Gear-drive loading;6.5inlength/6.3inheight |
| 485-4894 | 320D2 DNS / ZCS / RAR | Gray/fl ake iron pump body; legacy number |
A pump assembly and mounting seals are separate lines
The water-pump assembly contains its housing, bearing, shaft and impeller. The engine-side gasket orO-ring seals the mounting joint. A thermostat and housing seal are additional cooling-service components with their own numbers.
Radiator and oil-cooler measurements describe different circuits
For a radiator, record core height, width, thickness, inlet/outlet diameters and hose positions. For an oil cooler, record the oil port connection, core dimensions and mounting points. A combined cooling pack can contain both, but its circuits remain separate.
| Component | Measurement / connection |
|---|---|
| Engine radiator | CoreH×W×T, tank/neck position, inlet/outlet Ø |
| Hydraulic oil cooler | CoreH×W×T, oil-portthread/flange and mounting |
| Fan/shroud | Diameter, bolt circle, offset and drive |
| Water pump | Partnumber, drive, mounting face and seal |
Keep the fan drive and hose layout with the cooling pack
Fan rotation, shroud clearance and mounting offset influence the complete cooling arrangement. A bare replacementcore and acomplete radiatorwith tanks are different offers; list the supplied caps, drains, brackets and hoses alongside the assembly.
Order a complete engine cooling repair
List the pump, installation seal, thermostat, coolant hoses and driveitems independently. A leaking radiator core repair can retain its original tanks and mounts; a complete radiatorpurchase replaces the selected assembly. Use the engine serial with the machine prefix so the cooling list follows the fitted engine.
Buying questions
Is a hydraulic oil cooler an engine radiator?
They serve different fluids. A radiator cools engine coolant; an oilcooler serves the hydraulic circuit. A coolingpack can mount both units.
Is485-4894still a current genuine part number?
It is a discontinued genuinecatalognumber. It remains a useful old-partidentity for locating the corresponding replacement assembly for the fitted engine.
Does a water-pump purchase include a thermostat?
A thermostat is a separate cooling-service component. Include its number and opening temperature specification as another purchase line.
What distinguishes a bare core from a complete radiator?
A core repair renews the heat-exchangecore while retaining the chosen surroundingparts. A complete assembly offer identifies the includedtanks, mounts, caps anddrains.