ZF 4657.230.037 CONVERTER BELL for WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.230.037 CONVERTER BELL is a critical structural component that connects the torque converter assembly to the main transmission casing in WG190 and WG210 series gearboxes. This OEM genuine part, identified by SKU 4657.230.037, serves as the mounting interface between the engine flywheel housing and the transmission, ensuring precise alignment of the converter and pump assembly. Machined from high-strength cast iron, this bell housing absorbs torsional vibrations and maintains concentricity between rotating elements. When paired with the 4657101078: TRANSMISSION HOUSING, it forms the primary structural envelope that protects internal components from debris and contamination.

Symptoms of Failure

• Torque converter oil leaks at bell housing seam: Cracks or warpage in the 4657.230.037 bell cause transmission fluid to weep from the mating surface, often mistaken for a front seal failure.
• Engine-to-transmission misalignment noise: A rhythmic metallic scraping or thumping sound during acceleration indicates the bell housing has distorted, throwing the converter out of true.
• Vibration through floorboard at highway speeds: Worn mounting lugs or bolt-hole elongation in the converter bell creates driveline shudder that intensifies under load.
• Difficult gear engagement or delayed shifting: When the bell housing no longer holds the pump housing square, hydraulic pressure fluctuations cause erratic clutch pack application.

Technical Specifications

Compatibility

This genuine ZF converter bell is engineered for the WG190 and WG210 series transmissions, which are widely used in municipal buses, fire trucks, and heavy-duty construction vehicles. While the 4657.230.037 is specifically validated for these models, it may also be retrofitted to earlier WG180 and WG200 variants when the 4657201166: HOUS.FRONT SECT is replaced simultaneously. For complete assembly integrity, always inspect the 4657201168: HOUSING REAR PART and 4657298101: HOUSING REAR SECTION for wear when servicing the bell housing.

Related Components

Frequently Asked Questions

Q: Can I install the 4657.230.037 converter bell without replacing the transmission housing?
A: Yes, the bell housing is a standalone serviceable component. However, ZF recommends inspecting the TRANSMISSION HOUSING for cracks or wear at the mating face, as any distortion there will compromise the new bell’s sealing.

Q: What torque specification should I use for the bell housing bolts?
A: For the M12 cap screws (part 0636100801), apply 85 Nm (63 lb-ft) in a crosswise pattern. Always use new FIXING PLATE tabs to lock the bolts.

Q: Does this bell housing fit the WG180 transmission?
A: While the bolt pattern is identical, the WG180 uses a shorter converter. You must also replace the HOUS.FRONT SECT to accommodate the different depth. We recommend verifying your transmission serial number against ZF’s compatibility chart.