How do you break in a new outboard lower unit?

Lower Unit & Sterndrive Break-in Procedure

1. Fill unit with manufacturer's required gear oil to recommended level.
2. Adjust RPM at idle to manufacturer's specifications.
3. Proper shift adjustment is essential.
4. Jumping out of gear: If the unit will not stay in gear, the clutch dog has probably been rounded off.

Do you need to break in a new lower unit?

If it was a powerhead you would be worried about seating rings and other high tolerance items, but a lower units is pretty simple and does not require the break in of a new motor.

How do you break in a new outdrive?

Do not exceed 75% throttle for the first 5 hours. Shift into forward and reverse a minimum of 10 times in the first 5 hours. For hours 5-10 you should do short runs at full throttle. After 10 hours normal operation can resume.

How do you break in a new Yamaha lower unit?

Yamaha does not have a break in procedure for new lower units. Personally, I would limit hard use for 10-15 hours, but other than that, run it normally. Change or check the oil around 20. Yes they do come filled from Yamaha with gear lube, but they typically are a little low on the level.

What causes an outboard lower unit to fail?

Just random failures due to normal wear and tear. Wear and tear over time. Fishing line around prop shaft damaging seal and allowing gear lube to leak out or water to get in. Impact when a propeller hits bottom.

How does water get into lower unit?

You have seals on both sides of your water pump. You can have a warped lower unit which will allow water to seep in; even with new seals. You can have a touch or roughness on a seal seat that doesn't let a seal seal. Take the lower unit to a "good" dealer and have them go through your lower unit.

How often should you change 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 break-in a brand new boat motor?

After the first hour you bring the speed up and keep the boat under 3,000 RPMs. This speed will be just about on plane, and you DO NOT want to be full throttle. For the next 8 hours of run time run the boat at varying speeds and avoid running the boat at wide open throttle for more than 5 minutes.

How do you break-in a new Yamaha engine?

The first 10 hours of operation should be run using the following running pattern:

1. First hour – run the motor at varying speeds up to 2000 rpm. ...
2. Second hour – accelerate hard enough to put the boat on plane. ...
3. Next 8 hours – run the motor at all speeds but avoid continuous.

How do you break in a Mercruiser?

First 20 Hours:

1. DO NOT operate the engine below 1500 rpm for extended period$ pf time. ...
2. DO NOT operate at one continuous speed for extended periods of time. ...
3. DO NOT exceed 3/4 throttle during the first 10 hours of operation. ...
4. DO NOT operate at full throttle until the engine reaches normal operating temperatures.

How many hours does it take to break-in a new boat motor?

The rule of thumb for most marine engines are 10 hours for the break-in period. Some inboards require more, like a 20-hour break in, but I think this could go back to the debate of the “break-in period myth.” So we will leave that there with what the manufacturers want, and say.

What happens if you don't break-in outboard?

Failure to follow the “break in procedure” for an outboard motor can result in mechanical failures, reduced life of the outboard and even a voided warranty!

How long does it take to break-in a Yamaha outboard motor?

Correct break-in will help ensure proper performance and longer motor life. Failure to follow the break-in procedure could result in reduced engine life or even severe motor damage. All current Yamaha four-stroke motors require a period of 10 hours break-in.

How do you break-in a tohatsu?

Run engine at maximum of 2000-3000 rpm; Vary throttle during this time. Run engine at maximum of 4000-5000 rpm; Vary throttle during this time. Full throttle run allowed for no more than 5 min. at a time.

How many hours does it take to break-in a new Mercury outboard?

IMPORTANT: The first 20-hours of operation will have a dramatic affect relative to overall engine performance and expected engine life. Proper break-in practices reduce the potential for excessive oil consumption. It also helps to achieve better engine performance levels for a longer period of time.

How do you break-in a new Mercury outboard motor?

For this particular model, during the first two hours of operation run the engine at varied throttle settings up to 4500 RPM, with one-minute bursts at full throttle every ten minutes. Always warm up the motor thoroughly at idle before running at higher engine speeds.

Can you overfill lower unit oil?

you shouldn't be able to overfill lower unit oil. If you have oil coming out, I would say these are your possabilities. 1, he filled from the top down, and there is air trapped in it, and when it got hot, it is expanding and putting pressure on the oil. This could cause problems.

Can you fill lower unit oil from top?

oil is very thick and the air can't pass through it fast enough. You will fill the LU until oil comes out and you will think it is "filled" when in fact, it won't be. Filling from the bottom pushes the air out, unobstructed, hence a full LU.

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.

How long do lower units last?

Like all mechanical devices, it will be good until it isn't, possibly last 40 years or 4 hours, anywhere between those would be about right.. Depends on the application.

Will water separate from gear oil?

The time it takes the water to separate will depend on the system's temperature, as well as the additive formulation, age of the oil and the base oil type. Some oils are designed to hold water in suspension rather than to allow it to separate out, making gravity separation a less-than-effective strategy.

Does water float on gear oil?

Oil floats on water so it will be at the bottom of the casing.

How important is break-in period?

What is the Break-In Period? For years the break-in period has been a widely prescribed step for preparing your new ride. The purpose of this procedure is to set the piston rings into the new engine's cylinder wall and give the engine's parts time to shift and seal correctly.

How do you break-in a 9.9 Mercury?

Registered. The T8 break in is 1 hour at 1/2 throttle or approx 2,000 RPM, than 1 hour at 3/4 throttle or approx 3,000 RPM, for the next 8 hours avoid full throttle for more than 5 minutes at a time for the first 10 hours.