How long do risers last?
May 12, 2020 · How long do MerCruiser risers last? Mercruiser, for example, has a wonderful reputation for risers that sometimes don't last a year. On average, in saltwater use, good risers last about 4-5 years. Click to see full answer.
How often should I check the risers on my Boat?
Feb 14, 2020 · Secondly, how long do MerCruiser risers last? about 4-5 years . One may also ask, how often should risers and manifolds be replaced? As a general rule, you should start inspecting your risers and manifolds thoroughly after having used them for two years. Many exhaust manifolds can last you between three and five years but factors such as the type of water you …
How often should I replace my risers and manifolds?
Dec 05, 2007 · I bought a '95 Sea Ray 270 Sundancer last season. 7.4L Mercruiser 350hrs. on engine. Don't have records to indicate when the manifolds & risers were last replaced. I'm paranoid about them failing and trashing my engine due to water ingestion. Marine Max seems hesitant to remove and inspect due to possible problems.
What do you think about marine Max risers?
On average, in saltwater use, good risers last about 4-5 years. At 4 years, you should start worrying about them. Mercruiser 4.2 V6 riser. How long does an exhaust manifold last? A new and correctly installed exhaust manifold should last the life of your car. The biggest impact we’ve seen to the lifespan of manifolds of is rust.
How often should risers and manifolds be replaced?
But they do need replacing every once in a while. Luckily, if you make sure they are properly maintained, you can increase the life span up to 10 - 20 years. On average, however, you'll have to replace them every 3 - 5 years.
How often should you change your risers?
The general consensus on raw water-cooled manifolds and risers is that they will last upwards of (6-8) years. Keep in mind that most if not all engine manufacturers do not put out a service bulletin on how long these maintenance items will last.Sep 1, 2021
How do I check my Mercruiser risers?
1:106:21Mercruiser 5.7 exhaust riser inspection - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it's very important it's very easy to check - it's mainly four bolts on the top and hose clampsMoreSo it's very important it's very easy to check - it's mainly four bolts on the top and hose clamps that you just remove it and you inspect the water jackets.
How do you know if the manifolds and risers need to be replaced on a Mercruiser?
The warning signs of a potential manifold or riser failure are elusive. Hard starting and an unfamiliar knocking sound on starting are two signs of a leak, but by then the damage is usually done.
How do you clean marine risers?
One popular method to help clean up an old, dirty exhaust manifold is using an acid bath. Acid bath - An acid bath should be able to remove many of the problems that are present in your marine exhaust manifold. This is also very simple because it is a passive cleaning method that you can take advantage of.
How long do Mercruiser manifolds last?
Most experts suggest that a manifold will have a life expectancy of six to eight years.
How long do dry joint manifolds last?
Dry joint manifolds typically last at least 5 years, and have a much smaller chance of failing and letting water back in the engine. Unless the manifolds are leaking externally, I've seen people run these unopened for 5 years and even getting lifespans of 7 years and more.Aug 10, 2021
How do you inspect exhaust risers?
Remove the bolts securing the risers and/or elbows and look inside. Heavy corrosion or material dislodged by reaming with an old flat-head screwdriver or other tool warrants replacement. Check mating surfaces for flatness with a straightedge. Look for cracks.Mar 27, 2014
How do boat risers work?
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, (2) it serves as the device that introduces cooling water into the exhaust exit piping system.
What are exhaust risers?
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.
How do you pressure test a Mercruiser manifold?
0:192:24Pressure Testing Mercruiser Exhaust Manifold - YouTubeYouTubeStart of suggested clipEnd of suggested clipHey youtube so I thought I'd make a quick video on pressure testing my exhaust manifold from a 454MoreHey youtube so I thought I'd make a quick video on pressure testing my exhaust manifold from a 454 big-block mercruiser had a couple of engine problems while back dropped a valve seat.
When should I replace my manifold?
Do you trailer and flush religiously? If so, the manifolds will last a long time, even if raw-water cooled. However, I would personally pro-actively replace them if they are 1997. If your boat is in a saltwater slip, and it is raw-water cooled, they likely should be replaced sooner than 8 years.Jan 11, 2005
How long do exhaust manifolds and risers last?
As a general rule of thumb, when used in saltwater: Dry Joint: 5-7 years, although recommend removal and inspection at 3-4 yearsWet Joint: Approx....
How long do diesel exhaust elbows last?
As a general rule of thumb, when used in saltwater:Stainless Steel: 10+ yearsCast Iron: Approx. 5 years, although some manufacturers recommend remo...
Will a low hour engine require replacement of the exhaust manifolds and risers?
Yes, it does not matter how many hours are on the exhaust manifolds and risers, they will wear out if used in saltwater and let sit for long period...
How long do mercruiser risers last?
Mercruiser, for example, has a wonderful reputation for risers that sometimes don't last a year. On average, in saltwater use, good risers last about 4-5 years. At 4 years, you should start worrying about them. Mercruiser 4.2 V6 riser. Arrow shows where corrosion hole occurred.
How long should I keep a riser inspected?
Trying to salvage wasted risers is not worth the risk. (2) At the end of 4 years, automatically pull the riser (s) and have them inspected, even if there is no external corrosion. Just because you don't see it on the outside, doesn't mean that the riser may not be about to fail.
When did boat risers get sued?
The fact is that so many engine manufacturers, boat builders and riser makers got their pants sued off in the 1970's and 1980's for lousy designs that wrecked expensive engines, that they decided to resolve the problem once and for all by designing systems where this wouldn't happen.
What is an exhaust riser?
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 , (2) it serves as the device that introduces cooling water into the exhaust exit piping system. If the riser fails to accomplish either of those jobs successfully, ...