Mercury outboard lower unit oil leak

The oil is black and has an exhaust smell to it. V046022 Lower unit seal kit Mercury 4 cylinder 1961 and prior 4 cylinder gear shift motors except Mark 30 6395.

Motor oil is found spilled on the outdrive.

Mercury outboard lower unit oil leak. Mercury lower unit oil leak. The first thing to do when you get the LU dropped is to examine the top of the shift shaft seal to see if there is evidence of oil. As you are getting the oil out of the cavity drain surrounding the shift shaft odds are that it may be that seal.

Outboard Motor Lower Unit Seals Leaking Oil - YouTube. Almost every year about this time or earlier folks seem to notice an oil puddle under their lower unit. Most times what they are seeing is unburned oil from the 2 stroke combustion.

At colder temps the oil isnt burned fully and at the end of the day the oil slowly makes its way down and out at the prop where the exhaust exits. Investigating why I have white goop at the prop on my fathers Mercury 15 HP two strokes. Changing the oil in the lower unitFinally came to the conclusion t.

First of all the Honda 75 and 90s use Mercury 4 14 lower units. Honda buys them from Mercury so if necessary any Mercury dealer can easily service those lower units. Since youve got gear oil leaking out of the WATER intakes youve got a problem that needs immediate attention.

The oil is leaking between the machined surfaces where the lower unit mates up with the mid section. And it is leaking from a hole at the under side of the anti-ventilation plate above the oil level plug. I have no idea what that hole is for by the way.

The outboard is a 1999 Mercury 125 HP. If motor oil is leaking from the front of the engine its probably the front main seal. Based on where you find the oil leak there are various steps necessary to successfully repair it.

Consult your users manual and contact a technician about parts and repairs. Its also a good idea to stock up on Mercury oil to replace all the leaked oil from the engine. I have never seen a leak get better but almost 100 get worse.

You are taking a big chance on destroying your lower unit. Lack of proper lubrication can cause the bearings to seize gears to strip and if bad enough can cause the lower to lock up and destroy the splines in your crankshaft which will mean a new engine. My lower unit is leaking oil.

I thought it was from either the fill plug or drain plug but those screws are purty friggin tight. And there didnt seem to be. The drive shaft seals and the shift rod seal and the gasket are all above the oil level so it wont leak from any of those unless its been laid down.

If you are sure its gear oil its gear case off drain and do a pressure test if possible otherwise inspect the shift rod boot change if necessary change it anyway and also change the drive shaft seals note they are fitted back to back. Mercury 200 2010 Not rated yet Really slow oil leak. Had lower unit seal kit installed last November and put in storage.

A month ago went to check on it and same problem existed. The oil dripping from the lower unit where the exhaust comes out is a new issue. Its definitely oil from the fueloil mix not oil from the lower unit gear case.

The oil is black and has an exhaust smell to it. The oil in the gear case is almost as clean looking as it was the day it was put in. Engine seems to be running fine.

Even so when theres a leak the drive will be less damaged with a marine gear oil in there so thats what you should use. Almost all drives have different requirements ranging from the older Volvos that should have the same as the engine to clutch Alphas and outbords that use 80w90 or straight 90 mineralsemi synth GL4 or GL5 to the dual prop drives that requires VERY specific full synth. If your lower unit seals are bad enough to let gearcase lube leak out you will very likely see A SIGNIFICANT AMOUNT of water in your lower unit lube when you drain and change it.

A few drops of water is normal due to condensation so dont go nuts here. The oil squirters exist to lubricate the cylinders. This design of the block suppressed horsepower.

And connecting to PCMs would not give you more horsepower. Motor oil is found spilled on the outdrive. Oil is found on exhaust ports as well.

Oil especially leaks when the boat is tilted. Also found from the base of the trim. No oil in lower unit of 99 Mercury.

Mercury Prop Shaft Seal. Fuel and Lower Unit Oil. 25 hp 1986 upper crankshaft bearing and oil seal.

1992 6 hp mercury gearcase seal replacement. 1992 mariner 25 hp lower oil seal. Lower Unit Oil leak question on seal kit - 1976 Mercury 75 HP SN4400192 4.

Tilt the motor up to look for any oil leaks from these plugs. If there is any spilled oil in your area you need to clean it up. Also make sure to dispose of the oil properly.

Outboard Lower Unit Rebuild Cost. If you have a bad outboard lower unit you have several options. You can rebuild the unit or.

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.

How to Change Mercury 40HP Outboard Gearcase Lube. Remove the vent screw and its nylon washer from the upper right side of the lower unit. Put a drain pan under the lower unit and remove the drainfill screw and its nylon washer from the bottom right side of the lower unit.

Wait for the gearcase oil to drain out. V046022 Lower unit seal kit Mercury 4 cylinder 1961 and prior 4 cylinder gear shift motors except Mark 30 6395. V046032 - Lower unit seal kit Merc 650 800 900 950 1000 1100 1150 1250 1350 1400.

V046450 lower unit seal kit fits 1962 Merc 450 sn. Oil leaking from lower unit outboard motor. March 22 2021 Post category.

0 Comments 0 Comments. 501 oil from that high up of info on my 25 hp Johnson outboard lower leaks. To show lower-unit oil leaking from the fueloil mix not oil from the engine and I.

Guess that you can spray the cleaner directly into the engine and will. I have 2006 225 Merc Opti ProXS with 197 hrs on a Triton 215x boat. Boat sat a week and I discovered injector oil below dripping off the skag.

Leak was about 25 dia spot on floor. Oil comes from the small 4 holes on the front of lower unit. Looked at engine and could not find any major oil leak.

Oil residue in botttom of alum engine cowelling.