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Mercury 115 Pro XS Problems: 5 Common Issues with Solutions

Mercury 115 Pro XS Enigne Boat

You’ve installed one of the best boat engines for your boat. It’s the mercury 115 pro xs. It was expensive as well. But you suddenly notice that it has some issues. However, after spending so much money on this engine, you can’t afford any problems!

So, what are the mercury 115 pro xs problems?

Well, there could be a couple of issues with this outboard engine. First of all, engine being overheated is quite a common issue. A broken drive belt is also a general problem. After that, the trim getting stuck is also an issue with this engine. Besides, the engine not shifting into the gear is also problematic. Finally, the boat motor gets stopped all of a sudden which is a serious issue.

We have got the details adequately about its problems and solutions. If you have some free time, take a look at those!

Sounds good? Let’s just give it a read to know in detail!

Mercury 115 Pro XS Problems with The Solutions

We’ve learned the basics regarding the issues. However, this isn’t enough. So, now we’re going to read about the problems of this engine along with the solutions.

As said, we’d like to go to the details now without any further delay.

Problem 1: Overheated Engine

The needle on the thermometer is rising. This is almost often a sign of a cooling loop that isn’t getting enough water. Most small outboards lack radiators, just like your car.

On the other side, the water they’re floating in is used to cool the engine. The engine will overheat and eventually fail if the water supply is interrupted.


Look into the source. In the vast majority of cases, the problem is caused by a blockage in the raw water intake. Locate the inlet and clear the pipes of the engine. A loose hose clamp or a cracked or ruptured line can also limit water flow.

It also has the ability to spray moisture around the engine, which can be harmful. Examine your impeller to see if it’s in good working order. If not, then remove the impeller and put in a new one. Moreover, it should be serviced on a regular basis. Take a look at its residential quarters as well.

Due to scarring of the metal casing, even a good impeller might lose pumping power. Make sure your mechanic inspects the exhaust system for rust or clogs. Examine the exhaust risers and associated components on a regular basis.

Also, make sure to have proper ideas about the cost of replacing manifolds and risers. Because, of course, being aware of the time and money you’re investing is preferable!

Then closed-loop cooling systems in engines present extra issues. From the inside, these can clog the heat exchanger. To avoid this maintenance is required on a regular basis. This ensures that the coolant reservoir is full.

Problem 2: Broken Drive Belt

Mercury 115 Pro XS Broken Drive Belt

Over the ordinary engine noise, the sound of a drive belt tearing is unusual. You’ll know something’s wrong when the ‘overheat’ warning light lights. According to your voltage meter, the alternator may not be charging.

Not only do inboards have to deal with a broken belt, but outboards too. If the belt is broken, you won’t have an alternator or a water pump. There’s a lot of information about making a temporary belt on the internet. A fishing line, pantyhose, or something similar can be used for this.


The belt should be examined, adjusted, and dressed. You should also inspect the contact surfaces of the pulleys. Rough areas can be caused by corrosion on the pulleys. This can eat a brand-new belt in no time.

Problem 3: Trim Getting Stuck

You’ve returned to the ramp. But the outdrive/outboard will not raise. This is preventing you from loading the boat onto the trailer and onto the highway. This takes you to an unwanted situation which is quite annoying.


It’s a mechanical/hydraulic issue, assuming it’s not a blown fuse. The easy approach is to wade outback and manually raise it. To do so, you’ll need to know where the trim release valve is located.

When this valve is opened, pressure in the hydraulic loop is released, allowing the driver to tilt. Maintain a healthy fluid balance. In addition, inspect on a regular basis. Make sure that the fluid reservoir is free of leaks and water infiltration.

Problem 4: Engine Not Shifting into The Gear

You push the gearshift as you draw away from the dock. But the boat’s idling speed is never exceeded. Moreover, the transmission is not engaged by the shifter.

So, this is quite a disruptive situation. Not only that, but this can also lead to outboard shifting issues.


It’s most likely a broken or stuck connection. Begin with the gearbox. Check to check whether the cable from the transmission housing’s shift lever has come free. If the cable has been stuck due to internal corrosion, try wiggling it free.

Manual shifting is also possible at the engine. The most prevalent cause of transmission failure is a lack of fluid or gear oil. So make sure to keep those levels up to date and adjust them as needed.

On a regular basis, inspect the end fittings and hardware. Additionally, the cable should be serviced on a regular basis.

Problem 5: Boat Motor Getting Stopped

Boat Motor Getting Stopped


If you’re lucky, the kill switch has been accidentally pushed. It’s also conceivable that you’ve depleted your fuel supply. If none of these checks out, there’s a good chance you’re dealing with an electrical issue.

It could be a blown fuse or a tripped breaker. It could, however, be due to rust or a faulty connection. Furthermore, rust can result in a frozen boat steering cable.

You may also see boat motor stops due to not having a good propeller.


To begin, check to see if the lanyard key has come loose on any boat equipped with a kill switch and lanyard. At times, it may appear to be engaged. He has, however, moved just far enough to activate the switch.

Ignition switches can also fail due to defective connections or malfunction. This will, however, most likely present itself during the early stages of the business.

Corrosion is most likely to blame for your problems. Even some who are cautious about battery terminal maintenance fail to see the other end of those cables. They need to be cleaned on a regular basis, as well.

It could be something more sophisticated, such as an EFI engine’s ignition chip. You may need to seek professional assistance in that instance. Discover the different components that make up the ignition system.

Then check, clean, and apply an anti-corrosion chemical to each exposed connection. Do it on a regular basis.

These are the common problems of this boat engine.


1. How long can this engine last?

Well, it usually depends on the maintenance. But with routine maintenance, these engines may easily last 1000 hours or more. You can use it for heavy-duty fishing.

2. Is there any difference between Mercury 115 and 115 pro xs?

The new 115 Pro XS is 16 pounds lighter than its predecessor. It’s 18 pounds lighter than the closest competitor with 115 horsepower. Its top speed exceeds 115 miles per hour.

3. How much should you pay for mercury 115 pro xs?

The price of this engine starts from $10,830. However, there are additional charges added to the base price. The maintenance charge for this engine varies from one to another.

4. How fast is a Mercury 115 Pro XS?

Mercury 115 Pro XS motors offer great performance and are perfect for small to mid-size boats. They produce a top speed of 28 mph and can cruise at 24 mph. These motors are also very powerful and have a lifespan of up to 100,000 hours.

5. Is Mercury 115 Pro XS motor as good as Yamaha?

Mercury Pro XS motors are excellent choices for riders who want high performance and reliability. They offer great power, torque, and efficiency ratings, making them a great choice for both recreational and competitive riders. Yamaha motors, on the other hand, are known for their high quality and performance. However, they may not be as reliable or efficient as Mercury Pro XS motors.

6. How much horsepower does a Mercury 115 Pro XS have?

Mercury 115 Pro XS engines are designed to deliver great fuel economy while still providing good performance. These engines produce a maximum horsepower of 123. While this may not seem like a lot, it is more than enough power to get you through most tasks. Not to mention, the low emissions and fuel efficiency make these engines great choices for environmentally-conscious consumers.

Mercury 115 pro Review


Now you know the Mercury 115 pro xs problems. We hope we could convey the information about the problems and solutions of this engine. Make sure to follow our instructions in order to resolve the issues easily. Please contact us if you have any questions concerning boat outboard engines.

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