What Does Milky Marine Transmission Fluid Mean? #
Marine transmission fluid should normally have the appearance expected for the particular fluid specification used by the transmission manufacturer.
If the fluid becomes noticeably cloudy, milky or emulsified, water contamination should be considered.
How Can Water Get Into a Marine Transmission? #
One potential source is an internally leaking transmission oil cooler.
Many marine transmission coolers use raw seawater to remove heat from the transmission fluid.
If an internal failure occurs, water may be able to contaminate the transmission oil.
Other water-entry paths may also be possible depending on the vessel and installation.
Why Is Water in Transmission Fluid a Problem? #
Transmission fluid is responsible for lubrication, hydraulic operation and heat control.
Water can reduce its ability to perform these jobs and can contribute to:
- Corrosion
- Reduced lubrication
- Internal wear
- Mechanical damage
Continuing to operate with contaminated fluid can make the problem significantly worse.
Simply Changing the Fluid May Not Solve the Problem #
Replacing milky transmission fluid can temporarily improve its appearance.
However, if the source of the water has not been corrected, contamination may return.
The source should be diagnosed first.
After the repair is completed, additional fluid changes or flushing may be required depending on the transmission manufacturer and severity of contamination.
All Tech Diesel provides Marine Transmission Service & Repair throughout Southwest Florida.
