Overview
The ZF 4656.183.186 LOOSE PARTS kit is a critical service component designed specifically for the WG 160 series transmission. This genuine OEM assembly includes all necessary fasteners, seals, and positioning elements required to secure internal sub-assemblies within the main gear case. The SKU 4656.183.186 functions as a retention and alignment package, ensuring that the 4656101037: TRANSMISSION HOUSING maintains proper structural integrity under heavy torque loads. Without this loose parts set, the internal clutch packs and planetary gearsets cannot be correctly indexed within the housing bore.
Symptoms of Failure
- Transmission housing oil seepage at mating flanges: When the 4656.183.186 loose parts degrade, the seal between the 4656201075: HOUS.FRONT SECT and the main case begins to weep ATF fluid, leaving visible drips on the bell housing.
- Intermittent gear engagement hesitation: Worn locating pins and loose bolts from this kit allow the 4656201035: HOUSING REAR PART to shift microscopically, causing delayed engagement when shifting from neutral to drive.
- Abnormal driveline vibration under load: A failing loose parts set permits axial play in the 4472239178: HOUSING REAR PART, transmitting harmonic vibrations through the chassis at highway speeds.
- Metallic debris in transmission pan: As the retaining hardware fatigues, fretting wear between the housing sections generates fine steel particles that contaminate the hydraulic circuit.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.183.186 |
| Kit Contents | Bolts, dowel pins, lock washers, sealing rings |
| Material Grade | Heat-treated alloy steel (Grade 10.9) |
| Total Kit Weight | 0.85 kg (1.87 lbs) |
| Thread Pitch | M8 x 1.25 and M10 x 1.5 |
| Corrosion Protection | Zinc-nickel plating (240h salt spray) |
| OEM Reference | ZF 4656.183.186 |
Compatibility
This genuine ZF 4656.183.186 loose parts kit is engineered for the WG 160 transmission family. It is also compatible with the WG 180 and WG 200 series when used with the appropriate TRANSMISSION HOUSING variant. The kit directly replaces all fasteners in the front and rear housing sections of the WG 160, WG 180, and WG 200 models. For applications using the 4472239178: HOUSING REAR PART, verify housing casting revision before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306816 | CYLINDRICAL PIN | Aligns housing sections during assembly |
| 4656301148 | FIXING PLATE | Secures bearing preload in the rear housing |
| 0636100817 | CAP SCREW | Fastens the front housing to the main case |
| 4656301016 | SCREEN SHEET | Filters debris from the lubrication circuit |
| 4656301017 | SCREEN SHEET | Secondary filtration for the oil pump intake |
| 0636100803 | CAP SCREW | Mounts the rear housing to the adapter plate |
