What are the effects of slight water ingress in a manual transmission?

1 Answers
DelLorenzo
07/25/25 4:26am
Manual transmission slight water ingress can cause some screws inside the transmission to rust. It's best to replace components such as gaskets and oil seals to extend service life, and it's recommended to change the transmission oil and differential oil. Other symptoms of water ingress in the transmission are as follows: Moderate water ingress: White deposits appear in the oil pan. When oil mixes with water, it creates a white emulsion that adheres to the oil pan. If such deposits are present in the oil pan, it indicates moderate water ingress in the transmission. Components such as gaskets and oil seals, as well as transmission oil and differential oil, need to be completely replaced. Severe water ingress: Can be judged by the color and viscosity of the transmission oil. After water enters an automatic transmission, it can corrode the steel screws inside the transmission, requiring timely transmission maintenance. Similar to moderate water ingress, and in severe cases, the sprocket also needs to be replaced.
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