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How long does it take for symptoms to appear after water enters a dry dual-clutch transmission?

2 Answers

ValerieFitz

07/29/25 1:09pm

Generally, problems will appear after driving about 10 kilometers if water enters a dry dual-clutch transmission. If there is water inside the transmission, it should be replaced promptly; otherwise, the transmission may be damaged. The gear transmission inside requires oil, and the presence of water will dilute it, affecting performance. In such cases, the transmission fluid may be diluted, leading to issues like delayed gear shifting and impact. Additionally, it can impair the cooling effect of the transmission fluid, causing emulsification, reduced lubrication, and decreased wear resistance, ultimately shortening the transmission's lifespan. There are several reasons why water may enter the transmission: The transmission is not completely sealed, and water can enter directly through the vent hole. If an automatic transmission operates in cold water and the water level is high, the vent hole can draw water inside. Excessive road water splashing onto the vehicle body can cause water to enter the automatic transmission. Mild water ingress: Some screws inside the transmission may rust. Moderate water ingress: White deposits may appear in the oil pan. When oil mixes with water, it forms a white emulsion that adheres to the oil pan. The presence of such deposits indicates moderate water ingress. Severe water ingress: This can be determined by the color and viscosity of the transmission fluid. Water in an automatic transmission can corrode steel screws inside, requiring immediate inspection and repair.

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SiennaLynn

08/14/25 2:52am

Last time I accidentally submerged the chassis while driving by the river, and the transmission started having issues the next day. Symptoms of water ingress in a dry dual-clutch transmission usually appear quickly, with gear shift jerks and unusual noises potentially occurring within 24 hours. Since its clutch plates are directly exposed to air, water seepage can cause the friction plates to rust and slip. The worst situation I encountered was the transmission completely seizing up after three days, costing me several thousand in repairs. It's advised to inspect immediately after driving through water—don't wait until it gets severe like I did, or the repair costs could be half the price of a new transmission. If it's just been submerged, it's best to take it to a professional shop for drying treatment right away, which can salvage most of it.

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