16
Aug
Then put it back together and pressure test. If the oil is a milky color there is water in the lower unit and you will have significant problems down the road.
Milky lower unit oil means you have water in the oil which means youve lost a seal somewhere.
Water in lower unit outboard. What causes water to get in lower unit. Since the motor is only 3 years old and assumming you have run it moderately or less and you have changed the oil previously it may well be as the last post reply - vent andor fill plug. Last year when I changed my lower unit oil I inadvertantly forgot a teflon washer on one of the plugs.
Lower unit oil is water soluable what youre seeing sounds normal for end of the season especially for an older motor. Change it prior to putting it up for the winter any water mixed with the oil could freeze and create a real problem. You should be all set for that great striped bass fly fishing in your neck of the woods next spring.
Port motor on the other hand not so good I pull the plug and it seems as though the plug is defferent bigger than the stbd motor and I get milk out of the lower unit. This is my first time doing the lower unit oil on these motors as Ive only had it for a short period of time. I bought all new upper and lower plugs and gaskets but that port drain plug is much different.
My question is what could be the culprit letting water in the lower unit. Need a second option here on determining if I have water intrusion in the my Yamaha outboard. Decided to quickly check if there was any water in the lower unit as my prop shaft seal seems to be seeping Mercury performance lower unit oil.
I removed only the drain plug and after 30 seconds a little bit of water came out roughly half an oz. Pump it full of new oil. The oil can handle some water for a while.
Next fall drain the lower unit to remove any water for possible freeze damage and refill it for next season. Dealers sell a pump with a hose that screws into the lower drain hole and pump new oil in till it flows out of the upper hole. Water enters lower unit.
The lower unit heats up when the motors runningwhen its shut downtheres pressure - heat on a liquid creates pressurethe lower unit is sitting in cool water - the gear oil coolsa vacuum is createdwater is drawn into the gear. Pulled the boat this year crappy looking oil in the lower unit. It was a water oil mix as I just had the boat running 2 hours before and no time for it to separate.
Yanked the lower unit off and back into my work area. Pressure test at 6 lbs and 138 lbs. Held for 36 hours before I let it off.
It sounds like the water could be coming from his water pump issue. A bad housing and related seal would allow water in the the lower unit. I would flush it out good with oil or diesel.
Then put it back together and pressure test. There is a good chance the other seals are fine. Bad outboard lower units can give the operator shifting issues and other signs will include water in the gear lube metallic particles on the drain screw magnet clunking sounds when shifted or the loss of the ability to shift into gears.
Jacking it up To get the most out of your Outboards mount them on a jack plate. Engine position is critical when traveling at high speeds. The higher your motor is mounted raising the lower unit out of the water the less drag.
Of course another good reason you need low water intakes to keep the water pressure for cooling at proper pressures. I removed the lower unit again and this time I greased the water tube. Had failed to heed the warning to lube everything when working on an outboard.
I believe the water tube was not seating inside the new lower grommet and water was blowing by into midsection. The oil that comes out as you drain the lower unit can tell you a lot about whats going on inside the gearcase. Milky lower unit oil means you have water in the oil which means youve lost a seal somewhere.
The first place to look is the output seals which are found behind the propeller. If the water is coming out of the mating surfaces and the vent in the front of the gearcase it i totally normal and nothing to worry about. The lower unit is sealed under the water pump and the bearing carrier.
As long as water is not getting into the gearcase and the engine cools it is fine. In the water you would not notice it. How to get water out of outboard for winter.
Tilt it horizontal let any water drain. Tilt it vertical check lower unit for water drainrefill if any is present cover the prop to prevent entry of any precip forget the anti-freeze. Outboard water pumps arent complicated.
It is located just above the lower gear case assembly making it easy to service. Inside the pump housing there is a rubber impeller that is keyed to the driveshaft. As water enters into the lower gear case via the inlets on the side of the lower unit the driveshaft will turn the pump impeller.
Shaft length is 152025 I think. Most V hull boats have the long shaft. The depth of my BW at idle is 15 inches I think to the keel plus about 15 more for the lower unit.
Uh I would be very careful about diving in shallow water under moving boats–propellers will cause devastating wounds or fatalities. Beside this where does water come out of outboard. The water comes into the outboards engine through the lower unit which is below water level as the boat is moving.
Without a pump of some kind water couldnt flow up to the engine. Water in lower unit 60 hp johnson. 18 HP Prop Shaft seal.
Water in lower unit oil - 1981 E15RCIS 15hp Evinrude. 1998 200 hp Venom with water in lower unit. Outboard water pump service.
Loosen and remove the nuts that hold the lower unit in place almost all outboards have four nuts holding this in place. A socket will not fit so use a ring wrench to give good purchase on the nuts which will almost certainly be stiff to undo. If the oil is a milky color there is water in the lower unit and you will have significant problems down the road.
If this is the case go directly to your marine mechanic to diagnose the problem and hopefully fix the issue before it causes more damage. With the oil completely drained screw in your pump fitting and attach the pump. Remove the cap of your bottle of lower unit oil and screw the pump.
It keeps water from damaging the working components of a boat motor providing lubrication and preventing the motors lower unit from freezing. The O-Rings restrict liquid or gas from escaping. It will be inserted into a groove and squeezed between two surfaces in an outboard motor.