What to Do If the Transmission Housing Cracks?
2 Answers
Transmission housing cracks and perforations can be repaired using patch plates, welding, or adhesive filling methods. Patch Plate Repair: For patch plate repair, drill several holes with a diameter of 4.9mm near the crack or perforation, tap M6 threads, prepare an approximately 3mm thick iron plate, drill corresponding 6.5mm diameter holes on the plate, place an asbestos gasket between the plate and the sidewall, and then secure the plate to the housing with screws. Welding Repair: When welding, it is necessary to drill 3.5mm diameter holes at both ends of the crack, create a V-shaped groove along the crack, and then perform cold welding using copper-iron electrodes or cast iron electrodes. Adhesive Filling Repair: For adhesive filling, stop-drill holes must be made, a V-shaped groove opened, and then filled with epoxy resin.
If I encounter a cracked transmission case, my first reaction is to immediately pull over and stop driving, because a broken case can cause transmission fluid to leak, potentially leading to complete transmission failure or even stranding me in the middle of the road, which could cause a major accident. Next, I turn off the engine and check for any oil stains on the ground or signs of fluid leakage under the car. If there are, it confirms an oil leak issue. In such a situation, I would never attempt to fix it myself and would directly call for a tow truck to take it to a professional repair shop. Repairing a transmission case is complex—small cracks can be welded with professional equipment, but large cracks require replacing the entire transmission case or assembly. During regular maintenance, I pay attention to avoiding high-speed driving over potholes and change the transmission fluid periodically to reduce metal fatigue. If this does happen, it could cost thousands or even tens of thousands to replace parts, but safety is the top priority.
