What are manifolds and risers on a boat

This is just if the riser gaskets are leaking or you have internal crackscorrosion paths that allow leaks. Since the manifolds will be new you shouldnt have to tap them but it wont hurt if you do.

Inspecting Exhaust Manifolds And Risers Keeping a wary eye on raw-water cooled manifolds and risers can prevent the premature death of your engine.

What are manifolds and risers on a boat. What are manifolds and risers on a boat. Exhaust manifolds and risers are large metal castings that carry hot exhaust gasses away from the engine block on inboard engines. Sometimes the riser slopes down from the end of the manifold if the engine sits high enough above the waterline in which case its often called an elbow.

Exhaust manifolds and risers are large metal castings that carry hot exhaust gases away from the engine on inboard engines. All V-8 and V-6 engines for instance have a separate exhaust manifold along the side of each cylinder bank. Manifolds and risers are used to collect the exhaust gases from the engine cool them down and also allow the cooling water to exit.

On a petrol engine they are subjected to high temperatures and often saltwater resulting in a very tough life. Check risers and elbows starting at two years and annually thereafter if the boat is used in salt water. Even with a closed cooling system the risers are raw-water cooled.

Risers usually fail before manifolds do. Risers and manifolds used in fresh water have an almost indefinite life. Exhaust manifolds and risers are large metal castings that carry hot exhaust gasses away from the engine block on inboard engines.

All V-8 engines for instance have a separate exhaust manifold along the side of each cylinder bank. And so are the risers. One part of the riser system is between the exhaust manifold and the turbocharger.

This is normally fresh water cooled and does not figure into our discussion here. There is another component we also call a riser and that is the part that attaches to the exhaust side or rear of the turbo. The higher quality Marine Exhaust Systems we see today include exhaust manifold and riser designs such as the MerCruiser Dry Joint Exhaust System.

PPTs High Quality Marine Exhaust Systems include direct replacement Manifolds Risers and Spacers that are the marine industrys only internally and externally double and triple EDP Coated 3 year warranted exhaust systems. Risers are a little easier to find at lower prices than exhaust manifolds but both of these will cost you a fair bit of money. The better-quality parts are going to be on the higher end of the spectrum.

On PCM manifolds the bolts are 38-16 x 1-18 long Allen cap screws and there are 8 per side. They have their own issues on occasion but at least you can grind the heads off if you need to and still remove the manifolds then use vicegrips on the bolt still in the head. Inspecting Exhaust Manifolds And Risers Keeping a wary eye on raw-water cooled manifolds and risers can prevent the premature death of your engine.

The owner of a 30 powerboat hops aboard his boat one day to go for a cruise but his inboard V-8 engine is slow to start. Marine engine exhaust riser and manifolds are important parts of an engines exhaust system. An exhaust riser cools the engine exhaust before it is sent to the engines exhaust hose.

Mostly the exhaust risers and exhaust manifolds are equal in number and their total number depends on the type of the engine. The following article describes the construction and function of marine engine risers. This will make for even snuggness on the gaskets and greatly increase your chance for success when it comes to leaks on both the exhaust manifolds and the risers.

Since the manifolds will be new you shouldnt have to tap them but it wont hurt if you do. Also I would use new bolts. This job can be done by the home mechanic.

It doesnt take long for salt water to destroy a bare steel cylinder. This is just if the riser gaskets are leaking or you have internal crackscorrosion paths that allow leaks. Pull your risers and inspect.

If everything looks acceptable you only replace your gaskets and bolt it back together. Also what are manifolds and risers. Exhaust manifolds and risers are large metal castings that carry hot exhaust gasses away from the engine block on inboard engines.

The exhaust hose is then attached to the aft end of the riser or elbow. Today Im going to be repairing and replacing Risers Manifolds and Elbows on my boat. I will use Mercruiser parts.

I have some Merc seals as well. Im going to go over some of the tools you will need to do this job. So lets do that and then lets get to work on this.

TOOLS WE NEED-The first tool you need is a 916 on a 34 inch ratchet. Kit includes parts to configured for both Raw and Fresh Water Cooling Systems. Marine Power high performance semi-tuned aluminum exhaust manifold and riser kit.

Fits 50L305ci and 57L350ci engines. 2 Manifolds 2 Risers Riser to Manifold Gaskets and hardware. Exhaust comes unpainted ready for primer and paint.

Quick Easy and saves moneyTricks of the trade. Extend the life of the engine exhaust manifolds risers. The dry joint manifolds pass the water through a distinct pipe that runs separately to the join for the exhaust gasses so if this water jacket joint corrodes water can only flow externally and not into your cylindersthe distinct pipe is part of the casting of the manifold and riser it is not a rubber pipe so can be quite hard to spot.

Whats the life of an exhaust manifold and riser. Manifolds and risers that see heavy use in saltwater can have life expectancy as low as 3 years while manifolds and riser in engines rarely run and used in freshwater can last 15 to 20 years. No matter how you use your engine the older manifolds and riser get the chance of failure increases.

When do you routinely replace your exhaust manifolds. Boat US uses a probability table to guess the life expectancy of these items 6 years they estimate that the manifolds and risers have a 65 probability of failure and 8 years they estimate a. Manifold and Riser Sets.

These are all Genuine Barr Marine made in the USA. Barr Marine are know as the STRONG IRON for a good reason and have been manufacturing marine engine parts for more than seventy years. Barr Marine still manufactures marine engine parts for many of the original equipment manufacturers.

I need to replace the exhaust manifolds and risers on my boat. I know I can get factory ones but has anyone used after market ones that are better. Just figured I might upgrade if there is something better out there.

2005 57 OSXi motor.