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VOITH Transmission Oil Cooler Heat Exchanger 8989147
Troubleshooting Guide
1. Oil backflow into the engine expansion tank (auxiliary tank): Upon opening the coolant filler cap, a thick layer of reddish-brown or yellow grease (retarder operating oil) is observed floating on the surface of the coolant.
2. Sudden drop in retarder braking performance or fault code alerts: Coolant leaking into the retarder causes the retarder oil to thin and emulsify, resulting in a loss of high-pressure transmission capability; the dashboard will quickly display fault codes indicating issues such as excessive retarder oil temperature or abnormal pressure.
3. Recommended corrective action: If oil contamination is detected, the vehicle must be stopped immediately, and the 8989147 heat exchanger must be replaced entirely with a new unit. After replacement, the vehicle's engine cooling system passages must be thoroughly flushed using a specialized cleaning agent to remove all oil residue, and the retarder oil must be completely replaced with fresh, dedicated retarder oil; failure to do so will lead to more severe problems, such as engine overheating and internal mechanical wear within the retarder.
HVAC/Cooling System Overhaul BOM (Bill of Materials) - VOITH 8989147 Heat Exchanger
| Item | Part Name | Core VOITH Part No. / Spec | Functional Description | Unit | Qty | Recommended Replacement Reason & Notes |
|---|---|---|---|---|---|---|
| 01 | Heat Exchanger Assembly | 8989147 | Core replacement component. Side-mounted on the retarder body for oil-to-water heat transfer. | Pcs | 1 | Replace the entire unit if the outer shell cracks or internal tube bundles leak (causing oil-water cross-contamination). |
| 02 | Heat Exchanger End Cover Gasket | 56.4999.11 / 68.0938.10 | Specialized profile gasket located at the oil line interface between the heat exchanger and the retarder housing. | Pcs | 2 | Mandatory Replacement. Prolonged immersion in working oil over 100°C warps the gasket. Reusing it guarantees oil leaks. |
| 03 | Inlet/Outlet Water Line O-Rings | VOITH Genuine Fluororubber Ring | Seals the joints connecting the heat exchanger water chambers to the engine block coolant feed lines. | Pcs | 2 ~ 4 | Mandatory Replacement. Prevents engine coolant from leaking out under high pressure or drawing air into the system. |
| 04 | High-Strength Fastener Bolts | M10 / M12 (Depends on retarder model) | Specialized Dacromet-coated heavy-duty bolts used to secure the heat exchanger to the retarder block. | Set | 1 | Replace as needed. The heavy truck chassis vibrates intensely and is prone to rust; replace if threads slip or bend during removal. |
| 05 | Specialized Liquid Retarder Oil | Meets VOITH standards (e.g., Telus 32 / 46) | The working medium of the retarder, featuring exceptional shear resistance and ultra-high thermal stability. | Liters | Approx 6-8L | Top up or refill based on loss. If oil-water cross-contamination has occurred, the entire system must be flushed and 100% replaced with fresh oil. |
| 06 | Heavy-Duty Engine Antifreeze | Standard OAT Ethylene Glycol type (-35°C / -40°C) | The cooling and heat-dissipation medium. | Liters | As Req. | Disconnecting the coolant hoses will cause partial fluid loss. If the original coolant has been emulsified/contaminated by oil, the circuit must be flushed and refilled. |
| 07 | Water Hose Heavy-Duty Clamps | Stainless Steel T-Bolt Clamp / Wide-Band Clamp | Used to secure the rubber coolant inlet/outlet hoses to the heat exchanger spigots. | Pcs | 2 | Spare parts. Stock clamps lose tension or rust over long periods; highly recommended to replace during a major overhaul. |
DETAILS
| DESCRIPTION | Transmission Oil Cooler Heat Exchanger | PART NUMBER | 8989147 |
| WEIGHT | 8kg | VOLUME | 48 cm × 25 cm × 22 cm |
| TRUCK MOLDE | VOITH | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | CHASSIS |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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