Users' questions

Why does my exhaust manifold keep cracking?

Why does my exhaust manifold keep cracking?

The exhaust manifold is exposed to the extremes – it’s heating and cooling, which causes constant expansion and contraction. Manifolds can crack over time due to the stress from constant, extreme temperature changes.

Will a cracked exhaust manifold affect performance?

If the exhaust manifold cracks or leaks, it can cause an exhaust leak that can negatively affect engine performance. An exhaust leak can cause the vehicle to experience a reduction in power, acceleration, and even fuel efficiency.


https://www.youtube.com/watch?v=QPZJyHT5mGk

How long do dry joint manifolds last?

For a FWC engine setup in theory the manifolds should last as long as the engine. Meaning if the boat is in a fresh body of water the engine and manifolds can last in upwards of 20 years.

Can an exhaust manifold leak cause engine damage?

Besides leaks, cracks in the manifold can allow outside air in, which in turn can cause the engine to stall or die. If the crack isn’t fixed in a timely fashion, you can also cause major damage to the engine, such as blown head gaskets and overheated heads.

Can you drive with a bad exhaust manifold?

Driving with an exhaust leak is potentially dangerous as the fumes contain carbon monoxide. Another sign of an exhaust leak is if you have to fill up your gas tank more often. An exhaust leak can decrease fuel efficiency, causing your engine to work harder, and you to fill up your gas tank more frequently.

What problems can an exhaust manifold leak cause?

An exhaust manifold leak can cause burned exhaust valves, improper fuel trim as the leak introduces extra oxygen that is picked up by the oxygen sensor, and slow warm-up time which also causes high fuel consumption, which will also cause your catalytic converter to fail prematurely, and the exhaust fumes can easily …

Can you use JB Weld on exhaust manifold?

Will J-B Weld work on an automotive exhaust? Because of the extreme temperatures of exhaust systems, we do not recommend J-B Weld for use on exhaust manifolds and catalytic converters. Nor do we recommend the product for repairs within the combustion chamber.

What is a dry joint exhaust manifold?

The term Dry Joint Exhaust refers to MerCruiser’s patented exhaust system which utilizes 2 coolant passages vs 4, between the manifold and riser that are separated outside of the exhaust gasket. The term Dry Joint Exhaust is primarily associated with the cast iron MerCruiser Exhaust Manifolds and Risers.

How long do marine exhaust manifolds last?

six to eight years
Most experts suggest that a manifold will have a life expectancy of six to eight years. However, heavy use in saltwater can see this drop to as low as three years, while lightly used freshwater boats can get up to 20 years out of a manifold.

What kind of manifold does a MerCruiser 350 have?

Direct OEM Manufactured Replacement for Mercruiser Small Block Chevy 350 Dry Joint Manifolds and Risers Manifolds and 4″ Risers Constructed from Cast Iron and painted with black corrosion resistant paint. Fits 2002 and newer 350/377 engines with dry joint exhaust serial 0M317000 and up.

What kind of exhaust system does a Mercruiser have?

Mercruiser V8 Small Block Chevy (SBC), 305/350, 5.0/5.7L Complete Exhaust System w/ 6” Spacer, 3″ Hose Riser Includes gaskets for both freshwater and raw water cooling. Replaces factory Mercruiser OEM Part Numbers:

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 to install a MerCruiser dry joint exhaust manifold?

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