Water in outboard lower unit

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Impeller blades or vanes touch the liner as the driveshaft rotates.

Water in outboard lower unit. 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.

You have to change that oil and find out were it is leaking If the problem is not address the water will ruin the lower unit gears drain the oilwater mix and put fresh oil back in. The lower unit needs to come off the engine the water pump seals and area need to be checked so have your pump changedreplaced. Water in lower unit.

Ok well I just got back to the states after my quick deployment to the middle east. I decided to do some much needed maintenance and start with chanigin the lower unit oil on my twin 2004 200hp HPDIs. No issues with the stbd motor besides some hair on the mag plug but it was just a little bit.

Water in a lower unit indicates seal problems —-There should be none at all—–If the leak gets bad halfway between oil changes then what —–Just check price and availability of a new lower unit —–it is severe sticker shock for most ordinary working folks. The only way to find it was apply an air hose to the lower unit vent hole. The result was when the dealer inserted the drive shaft unit into the housing the O-ring gasket did not seat correctly.

So other that a bearing seal gone bad this is another potential place for water getting in. Check after running to see if it was condensation or water intrusion. If its water intrusion after running it the will be milky.

I thought I had water getting in my lower unit one season as I didnt drain my oil but instead just checked to make sure there wasnt any water sitting in the bottom and it was caused by condensation. 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.

After running in test tank for 5minutes I noticed the water discharge was far less. Also noticed substantial amount of water coming from between mid and lower unit. The weep holes for lack of better term in the front of the lower unit had pressurized streams of water coming from them I dont remember this being the way it was before.

There are three main reasons for tilting your outboard up and out of the water. Marine growth galvanic corrosion and electrolysis. Marine growth is the buildup of marine lifeforms such as barnacles algae and seaweed that attach to and grow across any part of.

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. Theyre commonly damaged when fishing line gets wrapped around the prop shaft and the seal can be inspected by removing the prop.

Water coming out between lower unit and midsection Sounds like you have it assembled properly. That occurrance of having water leak out that metal to metal area is normal and it will eventually seal up with salt etc. On many small outboards a complete lower unit re-seal water pump kit will cost more than the whole outboard is worth.

A proper pressure test will show which seal is leaking. Ive had very good luck replacing just the offending seal s but to each his own. Jul 18 2011 6.

The lower unit is also known as the gearcase. Its the portion of the outboard that receives the rotation and power from the engines powerhead to transfer it to the propeller and prop shaft. The propeller rotates which allows your boat to move either forward or backwards through the water.

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. Dis-assembly and reassembly of a lower unit on a Mercury outboard. This video shows how to take apart the gearcase of an outboard motor and shows how it wor.

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. This pump then draws water from the intakes into the housing. Impeller blades or vanes touch the liner as the driveshaft rotates.

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.

90 HP 4 stroke mercury outboard is leaking water from between the lower unit and the upper unit at a rapid rate. Fresh seawater is normally drawn by a belt driven pump from a thru hull fitting in hull of boat on inboards or by water pump in stern drive through the lower unit water passages on an inboardoutboard and then exits the boat through the exhaust. Click to see full answer.

Lower Unit Gearcase Seal Kit for Mercury Mariner Outboard. Sealing the gear oil inside the gearcase and keeping water from intruding into the gearcase are the two aims of all the shaft seals o-rings spaghetti seals and gaskets in a lower unit. Pressure testing a lower unit is best performed by an authorized Yamaha Marine dealer because depending on findings it may be necessary to disassemble the lower unit for further inspection.

Its best not to run the outboard right before checking the lower unit lubricant as this will agitate the oil with whatever air is trapped inside. The resulting fine bubbles might be confused with the milky appearance.