What Happens If Oil Gets Low On Lower Unit Of Outboard Motors?

What happens if lower unit oil is low?

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.

How often should you change outboard lower unit oil?

Most sterndrive and outboard manufacturers advise you to change the gearcase oil in your lower unit every 100 hours or once a year (whichever comes first). Clean oil is critical for protecting the heavily loaded gears in your lower unit and preventing expensive damage.

How do you check lower unit oil?

Lower Units Used as Inboard/Outboard Drives Wipe the oil from the dipstick with a clean, lint-free rag and screw it back into the oil filler. Unscrew the dipstick from the oil filler and note the gear oil level. The oil level should be at or near the center of the dipstick, and above the lower mark on the dipstick.

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How much does it cost to repair a lower unit?

A typical set of parts for the gearcase can cost $500-600 and may go higher if the gearcase is severely damaged. If you have your local mechanic repair the lower unit, his labor will run about $300-400 for this type of repair.

What type of oil goes in a Mercury lower unit?

Mercury Premium SAE 80W90 Gear Lube is recommended for lower units for outboards below 75 horsepower. Mercury Premium SAE 80W90 Gear Lube should not be mixed with Mercury High-Performance SAE 90 Gear Lube.

How often should I change my outboard oil?

Most engine manufacturers recommend that you change your oil every 50-100 hours (check your owner’s manual for your engine’s exact interval requirements).

Can you use regular gear oil in a lower unit?

So, can you use any old gear lube in your marine lower unit? If you want the best protection possible, and want your lower unit to last as long as your boat, then the answer is no. Consult your engine’s manual and look for the proper marine gear lube for your application.

What do you do if your lower unit oil is cloudy?

You definitely have water in your lower unit oil. First check to see if the drain screw and vent screw have washers or o-rings on them. If not, I would put some on and try it out some more to see if it’s still leaking. If it is, get it to a shop.

Can you fill lower unit oil from top?

Filling from the top down will not allow all the air to escape from the gear box The heavy gear lube will stop flowing down as cohesion from surfaces slow it down till it stops as the air wants to go out the top hole If you let it sit overnight all the trapped air would eventually make its way up to the top

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Why is my lower unit oil milky?

That milky color and consistency is most likely due to water intrusion. It will not break down from use and get lighter, like other oils as it breaks down and gets used it darkens. Time to change seals and when you do your water pump do the whole kit and not just the impeller.

What causes water in lower unit of outboard motor?

This is usually caused by a leaky seal due to fishing line or other fine debris that got wrapped around your prop shaft. If you have water in your oil, don’t finish the oil change because water will just seep back in when you get out on the water.

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