Exhaust Risers - Marine Engines : Boats and Yachts Maintenance, Repairs and Troubleshooting : Whether. All. marine inboard engines have exhaust risers. The exhaust riser has. If you wish to keep Uncle Big Bill at bay. Corrosion Failures.

All common gasoline engines use cast iron risers, as do most small. Cast iron, of course, corrodes, and. Problem is, there isn't. At least not that you're willing to pay for. If. you have extra $$$, have them custom machined from titanium and. That would set you back about $5,0.

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Actually, for the low cost, cast iron works pretty. But, like the tires on your car, they do not last indefinitely. Mercruiser. for example, has a wonderful reputation for risers that sometimes. On average, in saltwater use, good risers last. At 4 years, you should start worrying about them. Mercruiser 4. 2 V6 riser. It doesn't take. much corrosion to block these small water passages.

All marine inboard engines have exhaust risers. The exhaust riser has two functions: (1)to keep water from backing up into the engine through the exhaust piping and.

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Note that. the passages top and bottom only have a tiny hole where it. Hard to figure this. Merc 3. 50 riser.

Notice. the difference, especially the width of the gasket surfaces. This one had been cleaned of scale and. That didn't stop it from leaking and. Cast iron works well because it tolerates extremes. Since cooling water is injected into the exhaust. If you. were to heat up a cast iron skillet red hot and then pour cold water.

Same. thing with risers. Ergo, how they are designed has a lot to do with. The heat transition zones result in more rapid rates of corrosion. Cast iron corrodes in a unique way, depending on. When. the scale gets that thick, it ends up blocking the water flow. The. other problem with this is that this scale stays wet, retains water. Unlike aluminum. or Corten steel, the corrosion does not serve to protect the metal.

Therefore, as cast iron corrodes, the rate of. Meaning that the rate of.

Get the picture here? Flip Book Maker 3 Crackheads. The thinner it is, the sooner. That's because the riser is closed. Naturally, it costs more money. The water induction. Notice the oil filter adapter where you can easily.

Crusader riser, salt water cooled. This. design uses a steel insert ring with the water passage all around. It too, is narrow and over time became completely blocked. As with engine blocks, risers have water passages. Some riser designs, like those of Mercruiser.

This causes two problems. Neither make for. Even worse though, if corrosion makes a hole between. This is a very unfortunate state of affairs.

You don't want this to happen because. Of course. you cannot see that hole because it's on the inside.

One day you. go to start your engine and nothing happens. The starter clicks. Water has seized the engine up.

On that day, there will. The moral of the story here is that you need to. Pay Little Bill to stave off Big Bill.

Or. wait and pay Big Bill. Replace them if Mr. Goodwrench. recommends that. Trying to salvage wasted risers is not worth the. Just because you don't see it on. No, it does not matter how many hours there are. The hour meter measures itself, not the rate.

Throw them overboard. But do not judge the condition. They don't mean anything short of a meaningless. Aluminum Risers  Aluminum. Aluminum. is the wrong material to use for risers, which is all there is to. Yanmar engines have them.

Good. luck is needed here. Leaking Gaskets  The risers.

If water is leaking to the outside, it is also leaking. Count on it. Address the situation IMMEDIATELY.

A gasket. cannot seal to an eroded surface. Once this happens, no gasket will. Free Download Microsoft Picture Manager 2003. If you thought. risers were expensive, wait till you see the cost of manifolds. Sail Boats  Exhaust systems.

Most systems are okay in terms of height. The best thing for a sail boat is to use a dry.

That means no water cooling until. This will. eventually make life unpleasant for you.

Often combined with water. Personally, I do not like water lift mufflers because.

There often. isn't enough space to install them correctly. If you do know, then it is an obvious disaster waiting to. I find so many half- baked systems like this in sailboats. If you are in doubt, have an expert look at it. Here's a picture that would make any. This cast aluminum riser is guaranteed.

The insulation on the down side indicates. Diesel Engines  Most diesel. Didn't. I just say stainless was not so good? Yes, but changes in design. Sometimes great, great granddaddy. With turbocharged engines, the exhaust system is.

And so are the risers. One part of the riser system is. This is normally. On. all Caterpillars since at least 1. On Detroit Diesels it may be separate elbows on. It doesn't much matter except in price because. Both the iron and stainless versions are shown.

Iron riser for the non turbocharged. Cat 3. 20. 8. Here the very small water passage holes became completely. Riser failure here wrecked. The latest diesel riser designs utilize. This precludes the possibility of riser. Detroit Diesel. 8.

V9. 2One difference between gas and diesel is that diesel. Therefore. whatever you get is an after market product, about the quality of. I know anything. The fact is that so many engine manufacturers. And so it doesn't, proving once. Diesel exhaust pipes have to be huge because these.

The riser, which we can also call a water induction. And because the pipe is very. Otherwise, the. fiberglass, rubber or silicone parts will burn up. That's not good. so they put a lot of holes all around the induction section like. This causes a spraying action that gets all.

But they are small holes, aren't they? And you. know what that means. Small holes normally become big holes, except. Remember the. case of the ? Now you know where all those broken pieces of water pump impeller. They go completely through the system and stop right.

Yep, lodged right against our little holes there. Naturally, this creates the same problem as with a gas engine. Angry as hell and not going to take it anymore. You miserable chunk of stainless!

An infrared thermometer gun, that is. This allows. us to . Actually, you can even feel around the. Consequently, the moral of the story here is that even.

A little Priority Management 1. DXDCIIV. Title III is in order here. Under the heading. A stitch in time. If the system is not designed right, then it is.

This is one of. the most common causes of turbo charger failures. You replace a. $2. This can happen when the elbow. Bearing in mind that a little change in trim of the.

Notice that the stainless riser in the photo above is. Even if it did leak, the water would run. Very good. Large diesel induction elbow. This. one is 5 feet long. In this photo, the top of the pipe is.

There should not be any rust stains on the inside. And many of them are only welded from the outside because.

Ergo, leaks usually. One very good thing about stainless is that. Meaning that there can be a little hole smack in. The. really nice part is that Mr. Goodwrench can take that part off. That part may last indefinitely. You like. it and I like it.

Neither of us like it when the experts make big. Like attaching a carbon rubber hose to a stainless riser. That rubber will eat the. At the point where the hose attaches to the riser.

In the simplest of all possible terms, water gets between. So, if you see. leaks occurring at the point where the hose attaches to the elbow. Because, if. you don't, you can be sure that like Paul Revere riding through. Big Bill is a comin'. If you wait until the little. Save your britches and take.

Epilogue  Leaks on engines. They are trying to tell you that. This. is part and parcel of why boat ownership is so dang expensive. While we. can marvel at how fish thrive in this stuff, and relish eating. But it's a. whole lot cheaper to nip these problems in the bud, rather than. Posted October 2. Marine Investigations: Chapter 9 - .

Machinery Failure Analysis.