How many hours do MerCruiser engines last?

The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions.

What temperature should a MerCruiser 7.4 run at?

My 7.4 runs about 160-165.

How many hours is too many on a used boat?

The Key Takeaways. As a general rule, experts say that 1,500 hours on a boat is a lot. But actually, it differs a lot based on regular MAINTENANCE and USAGE. Regardless of the hours, a boat that is used around 30-100 hours each year and serviced annually would be a great pick than a boat used less or serviced rarely.

How do you check hours on a Mercruiser?

Read the hour meter from left to right. Most hour meters have a five-digit display. The first digit is thousands, second is hundreds, third is tens, fourth is the single hour digit and fifth is tenths of an hour.

How much does it cost to rebuild a 454 MerCruiser?

It usually costs between $2,500 and $4,000 plus parts and labor for an engine rebuild.

What oil does a 7.4 MerCruiser take?

There are four cylinders in the 0 engine, which has a power output of 135 horsepower. Its displacement is three. 0 liters. It is recommended that the manufacturer’s own MerCruiser SAE 20W-40 Full Synthetic Oil be used for the engine.

Does a Mercruiser have a thermostat?

The thermostat in your MerCruiser Alpha monitors the temperature of the engine. The impeller inside the out-drive sucks water into the engine. If the engine temperature is too hot, the thermostat opens to allow more water into the engine.

Why does my boat overheat?

-The water pump impeller has failed. -The engine belt driving the water pump is bad or broken. -The engine raw water strainers are plugged. -Or maybe the grills or grates where the water is pulled into the cooling system is blocked or plugged.