the lower unit is fairly easy to remove, if you are a do it yourselfer, change the water pump while you have it apart. Found water in lower unit when winterizing 1999 Evenrude 90 HP 2-stroke. No one wants water contamination in their lower unit. I changed the oil, installed new gaskets on the drain and vent screws. This will tell you the type and weight of gear lube that you’ll need, and may even include a diagram and instructions on how to change it. Change the oil, run the boat at high speed for an hour. Go … You can actually mix your lower unit oil 50/50 with water and it will still properly lubricate your lower unit, because of the type of synthetic oil. Brown lower unit oil is a sign of rust and is usually found in a gear case that has been sitting for awhile. Now my question is how else is water able to get in. There is a good chance the other seals are fine. Run at high speed for another hour. I have a 86 mercruiser alpha 1 and last summer I found water in the lower unit oil. For example, in a boat that is put in storage and left for a season, or a year or two. If you don't want to change it yourself you could remove the lower unit and take it to a shop. But definitely not recommended. Lower units house the gears, drive shaft, propeller shaft, water pump and raw water inlet for both outboard motors and inboard/outboard motors, where the lower unit is known as a sterndrive, gear case, outdrive or simply a "drive." A bad housing and related seal would allow water in the the lower unit. Hello everyone!! Took to dealer who pressure tested and said it was OK.Thought maybe oil plug not tight enough. I have never had the lower unit apart. This fall I was winterizing and found the oil milky again. Try to do the oil check within an hour if you can. Turned out I did not have the water tube aligned and was getting no water to the thermostat housing. It still would be unlikely that you would have rust in your lower unit even if it was it had a lot of salt water in it, because of the types of metals used and it. If there was any water in the lower unit when it went into storage, then the water and gear oil eventually separated. So i am not sure what else to do. I was told I forgot the o ring . Let it sit & cool down for 10 minutes with the lower unit in the water. Last year I had my prop shaft and the seals replaced, hoping to cure the problem. I have always had water in my lower unit when I change out the oil. Found full of water … They put new grease and plug gaskets in. The faster gear oil can separate from water, the faster it can start protecting your gears. Used this spring six or eight times and decided to check today. You most likely have a bad seal in the lower unit. This test shows that after only 20 minutes Royal Purple Max Gear was completely separated from water and after 60 minutes conventional oils were still partially emulsified. It sounds like the water could be coming from his water pump issue. Check the oil to see if the lower unit oil is still clear or not. Always consult your owner’s manual before changing your own lower unit oil. I did this about mid summer, and when I went to do my winterize and change lower unit oil, guess what, water in the lower unit. I would flush it out good with oil or diesel. How to Change Your Lower Unit Oil. Ok, either way, if in fact it is the seals, there are 2 areas where the seals are prone to wear, the most common is the upper seals (2) in the upper unit housing where the lower driveshaft passes through, and the other 2 seals are directly under your water pump impeller base housing..which is the lower unit driveshaft seals Then put it back together and pressure test. Put it all back together and gear oil leaked out of lower unit before ever reaching the vent hole. Dropped the lower unit to investigate.
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