How long do MerCruiser manifolds last?

OEM MerCruiser manifolds and riser elbows can last more than 5 years in salt water if properly cared for, but, every year over 5 years on a salt water application is a gamble with the life of your engine on the line.

How long does it take to replace a manifold gasket?

Replacing the intake manifold gasket is not a simple job it takes time. Most experts suggest that an experienced professional mechanic should take about 5.7 hours of work time. However, this number might be a little lengthy, and it could be in certain busy repair shops.

What is the horsepower of a MerCruiser 350 MAG MPI?

300-hp
The 5.0L MPI MerCruiser sterndrive package typically has about 260-hp. The 350 MAG MerCruiser is called a 350 MAG and typically is rated at 300-hp.

How long does an inboard engine last?

An inboard engine can run for an average of between 1500 to 2000 hours depending on the type. As with outboard engines, maintenance is crucial to prolonging the usefulness of an inboard motor. Ventilation is crucial for an inboard motor and should be continuously checked; otherwise overheating could cause a fire.

Can you drive with a bad intake manifold gasket?

Generally a really bad intake manifold gasket will make a car run rough at idle and/or cause a service engine light to illuminate. As far as driving the car, as long as you don’t have a fluid leak or the car is not stalling or running rough, it should be fine to drive for a few months.

How hard is it to change a intake manifold gasket?

It’s easy not to get the cooling system fully filled the first time. If you need to top it off, be sure to park the car and let it cool off before opening the reservoir cap. Replacing a manifold gasket can be a daunting job, especially because of the danger of making a small mistake that can ruin your engine.

How many hours does a 350 MerCruiser last?

The 350 MAG with proper maintenance should last at least 2000 hours before it needs a major rebuild.

How many hours will a 5.0 MerCruiser last?

Small plane engines must be rebuilt in the range of 1200-1600 hours depending on make and they are usually well maintained. If you do, you should get more than 4-5 years unless you’re boating in the saltiest of waters. I have a 5.0 with 775 hours still runs good. As said, you need to keep up with maintenance.

What kind of exhaust manifold do I need for a MerCruiser?

Fits 4.3L 262cid GM V-6 Engines. Can be used with fresh water or raw water cooling systems. New exhaust manifold and riser kit for MerCruiser small block marine gas engines with dry-joint style exhaust (2004 and newer, 5.0L, 5.7L, 6.2L) Does not replace older manifolds, log style manifolds, or 14 degree down-angle risers.

How big are exhaust manifolds and risers in a marine engine?

Exhaust Manifolds and Risers New exhaust elbow / riser. Direct Mercruiser replacement. Used in 2.5L and 3.0L late model applications from 1982-85 and 1990 and later. 4″ Diameter. Two bolt pattern.

How is the intake manifold on a MerCruiser cleaned?

Cleaning and inspecting the MerCruiser intake manifold isn’t a complicated process but it should be a thorough process. The manual discusses how the mechanic should clean the cylinder head mating surface, how to inspect the manifold and which cleaning material the mechanic should use. How to clean gasket materials from mating surfaces.

Why are my exhaust manifolds failing on my Boat?

Inspection tips that might help you prevent an engine catastrophe. Iron castings, such as exhaust manifolds and risers, fail from corrosion as they cool and contract. Many a boat that runs well has been put in its slip on Saturday afternoon only to have water siphon from corrosion-damaged castings into the cylinders overnight.