WHY You NEED To CHECK Your BOAT'S MANIFOLDS

[@KeysBoatingChannel]

Hi Everyone! Watch the NEW Re-Vamp of this video with (No Music) and more details Click here to watch now: kzbin.info/www/bejne/a5fUn62Kgb6tpZo To Watch our Manifold, Spacer, and Elbow Removal & Replacement Video click here: kzbin.info/www/bejne/e4fRapqmgtpgqrs Thanks for watching! Peace from the Keys!

[@clintperez9981]

This is very true. I am currently going through an engine rebuild because my manifolds hadn't been changed in over 5 years. I had no knowledge of that and no one, not even the boat surveyor mentioned that when I bought it used. Luckily I found an honest mechanic who told me about this and now I'm changing the manifolds on my other engine with all new parts. I am not mechanically inclined but to save money I KZbin'd how to do it and I ordered and installed the parts. It'a heavy job but not a difficult one. You are definitely right about no one tells you this until something goes horribly wrong. Thank you for putting this out for all boaters.

[@KeysBoatingChannel]

Hi Clint! Thanks so much for watching our video. Its our pleasure to inform everyone about this, you're Welcome! Peace from the Keys!

[@keithdickinson6045]

Thanks for posting. Mercruiser fixed this issue back in the early 2000's by designing the "Dry Joint Exhaust System". You can look it up online but the problem really isn't an issue as much as it used to be. My boat is a 2005 and the exhaust system is as good as it ever was. I run in a combination of fresh and salt water (I flush after each use regardless). If you look up the life expectancy of these systems you won't find much info on them because the failure rates are slim. I'd say most people are replacing them because of cracks from leaving water in the manifolds. Anyway, just my .02. Thanks again.

[@KeysBoatingChannel]

Hi Keith! Great info, thanks for your comment, and watching our video! Happy Boating! Peace from the Keys!

[@thediplomasta5891]

Boat mechanic here. They like to set the replacement interval at 5 years, like you said. But really, they last as long as they last. It's very common for them to last 10 to 20 years in fresh water. If you are worried about yours, get yourself an infrared temperature gun. They are ten bucks. Then, you can go around with it, testing the temp of various parts of the engine, to help you zero in on what's going on. Check the exhaust manifolds, risers, intake manifold (which is where the engine temp sensor is), and also the thermostat housing and all the hoses going to it. The big hose should be as hot as the engine. The one from the outdrive should be cold. Don't blindly trust your temp gauge. It is a reference only. If your gauge says you're overheating, but the risers feel cool, then there is more to the story. The temp gun will help you. 👍

[@KeysBoatingChannel]

Thanks for your expertise! This information will be really helpful, and I will get a temp gun. Thanks for watching! Peace!

[@kevinheiberg227]

How hot should the manifold/riser be?

[@thediplomasta5891]

@@kevinheiberg227 most of the time, you should be able to touch the top of the riser comfortably. If you have to yank your hand away, it's too hot. Sometimes one side is a little hotter than the other, due to the holes in the riser gasket. This is normal, as long as the temp is within range. Varies from 90°F to 150°. If temp climbs above 190° max, shut her down. If you pass 200, you're about to melt your exhaust boots. If there's a problem with the water pump, the exhaust will overheat BEFORE the engine does. If you think the riser is plugged up, take it off and look inside. It's not a difficult job. But most of all, replace those riser gaskets!! Don't reuse those. And do NOT put any shit on the gaskets! NO RTV, unless you want to blow your engine! That gasket cannot leak, or water ingestion and hydrolock occurs.

[@kevinheiberg227]

@@thediplomasta5891 thank you very much for your answer. I have a problem with my engine that i think is caused by a bad riser/exhaust manifold. When i have driven the engine for a little while, and the engine is at operating temperature, the engine rund very hard at idle speed- and is hard to start when hot. I checked the carburator choke, and it is completely open, so that was not the problem. I suspect that water is dripping down in the cylinders when the thermostat is open, causing the engine to run hard when hot. The exhaust manifold is also very hot and has not been changed for many years (salt water cooled). May i be right when suspecting bad riser/manifold? The engine runs good before its completely hot.

[@thediplomasta5891]

@@kevinheiberg227 the only way to know is to take it off and look. I bet you could get a lot of rust flakes out with a screwdriver. Maybe it's just blocked with a big rust flake. It's worth a try before buying new ones. But yes, it sounds like it's getting down to that. Especially with saltwater use.

[@2BearsOutdoors]

My big brother... Wow! This is outstanding.. Great video.

[@martinschubert8388]

So our manifolds 5.0 mpi are 19 years old and look like new. I'm not kidding.. Got it onls 4 weeks a year in the water and we were winterizeing with antifreeze after and doing the oil changes engine and gear oil. Boat does great

[@KeysBoatingChannel]

Hi Martin, thanks for watching! Yes, minimal usage and prevention can prolong the life...but I would have them inspected once in a while...its inside where the problem starts. Thanks so much for your comment...Peace!

[@bikerdude2941]

Background music is way too loud but thank you for sharing

[@KeysBoatingChannel]

We have an Updated (No Music) version of this video! Click here to watch now: kzbin.info/www/bejne/a5fUn62Kgb6tpZo Thanks for watching. Peace from the Keys!

[@2BearsOutdoors]

Wow didn't know. Very valuable information. I'm sure many inboard boat owner finds out the hard way. Great informative video .

[@KeysBoatingChannel]

Thanks for Watching! Hope this helps others avoid catastrophic failure before it's too late. This is one of the most neglected items in a inboard outboard engine, besides the impeller. Blessings!

[@2BearsOutdoors]

@@KeysBoatingChannel for sure, No doubt. Awesome job

[@KeysBoatingChannel]

Thanks for your support and comments!

[@2BearsOutdoors]

@@KeysBoatingChannel ❤️

[@dennisbean1109]

thank you very much for your common sense and simple HELP Sir ...GOD Bless You...CHEERS

[@KeysBoatingChannel]

Hi Dennis, Thank you for watching our video! Blessings! Peace!

[@jakeroth5809]

Great video I been there brother I change mine every three years and do it myself

[@KeysBoatingChannel]

Hi Jake, Thanks for your comment and watching our videos. Every 3 years is the safest way to go. Happy Boating Brother! Peace!

[@2BearsOutdoors]

Great topic and editing. Thank you for this video. This is going to help many.

[@JohnBraman413]

i've used barnacle buster and give mainifolds and risers a bath to clean them. works good on heat exchangers also.

[@KeysBoatingChannel]

Hi John, thanks for your comment. That's great information, we've used it for our a/c and head or toilet raw water lines...makes sense to use it in manifolds too...thanks so much Brother. Happy Boating! Peace!

[@nikolajlundthomsen4799]

Nice valuable information. I have a mercruiser diesel 4.2 6 inline. Where do I get manifold/riser for this?

[@KeysBoatingChannel]

Hi Nicolaj, I will check for you. Send me your boats serial number at [e-mail] Thanks for watching our video! Peace from the Keys!

[@Bierdaddy1]

1987 omc 5.7 w open cooling system, fresh water. Doing maintenance now. Guessing your system is after the exhaust flapper delete because of those riser extensions or do you still have flappers to guard against water backing into the exhaust? Wondering if I should replace or omit mine. 🤔

[@KeysBoatingChannel]

Hi, thanks so much for watching our video. I was getting information to check them just recently. I don't know if mine has them in place or not, but I wanted to check to make sure they are not melted or damaged by heat. It can be blocking the passage and also cause overheating. If my overheating problem continues that would be one of my next area of exploration. Thanks again for your comment. Peace from the Keys!

[@305_beatbox4]

Fantastic video 🔥🔥👌🏽💯✊🏾✌🏽

[@KeysBoatingChannel]

Thanks for watching Bro! Peace!

[@MikeCarey-u7q]

A closed cooling system sorts this issue out. (Heat exchanger) I had a magnum 350 for 11 years with no issue. Always flushed when back home on the trailer.

[@KeysBoatingChannel]

Hi Mike, Yes, I thought about it converting it. It's better than the raw water system. Peace from the Keys!

[@budh420]

Also make sure you get a good mechanic, Im working on pretty much the same engines 2002 and the owner had someone else before I worked on the boat install new manifolds, risers, and elbows on twin engines and I just had to tear both top ends down because they didnt have the bolts tight and didnt clean all the paint off the mating surface and caused 7 grand in damage in 2 months, all 4 manifolds, these are salt water engines and the water just sat in the manifolds rusting the exhaust valves and the outside of the exhaust ports and ruined two heads, I did find water in all 4 valve covers and lifter valleys but thats an unrelated intake gasket leak, there was no water in the cylinders or on the intake valves

[@KeysBoatingChannel]

Wow! That's the kind of things I'm taking about. Thanks for posting this information, this is the reason I try to do everything I can myself. Because you can't just trust anyone, specially without knowing them or referral. This information will help others with the same issue. Thanks Brother for taking time to post your experience, and watching our video. Peace!

[@budh420]

I fixed the problem, turns out engines leaking salt water can cause low pressure in the water system and cause exhaust reversion where water can actually get sucked back into the engine because it’s not under enough pressure exiting the exhaust elbow and the last mechanic that worked on it rebuilt the raw water pumps and they started leaking and he said the pumps were bad. I found he used the wrong O-ring and the pumps work perfectly fine and now there’s no water in any manifold at all and the engines run great and my customer couldn’t be happier

[@snakeeyes4424]

Great video my friend a most see if you have an inboard out board engine It has happen to me on my 5.7 Mercruiser. I change the Manifold and raisers every 2 1/2 to prevent that situation I got it to 2 hours installation . I do the installation my self there are videos on you tube on how to do it. The parts used to cost about $650.00 I did my last change on February 2024 and the parts cost me $1,100.00 ( That's Inflation for you) So 2 1/2 year ago from February 2024 it costed me $650.00. I f you are in salt water you most do the change. I have same engine since 2010 and is not a genuine Mercruiser but a rebuilt. I do salt away too and i think it help I use my boats every week and I am out in the water cruising and deep sea fishing. I have a single Mercruiser and an auxiliary 15 horse power outboard Mercury for emergencies.

[@KeysBoatingChannel]

Hi, thanks so much for watching our video and posting your experiences. Your experience will help others, thanks. Peace from the Keys!

[@peptoid1]

thank you for the best advice that i ever heard.

[@KeysBoatingChannel]

You're welcome! Glad this helped. Thanks for Watching!

[@parkcitiesmobiledetail4864]

I have a 1998 deck boat with a 5.0 engine that is locked. I have been told that I can replace this engine with a chevy 5.0 or 5.7 engine, is that correct? What should I look out for during this process

[@KeysBoatingChannel]

Hi, thanks for watching our video. First, you should check with your boat manufacturer and see if your boat has the capacity to handle a larger engine. I would not use a regular car Chevy engine in a marine environment. I have not tried it, but you should ask a qualified marine mechanic. Thanks for your comment. Peace from the Keys.

[@arthurgay5746]

The manifolds on my old ass Bay liner are over 20 years old. They originally came from Lake Michigan so they never saw salt water until I got them. I remove them every fall when I store the boat and I bring them into the basement for the winter. I have them pressure tested at the local automotive machine shop before I put them on.

[@KeysBoatingChannel]

Hi Arthur, thanks so much for watching our video! Yes, doing the Flush, inspection and pressure testing every year will keep Mr. Rust Corrosion at Bay, but down here its a different story. My manifolds here, doing a flush every single time we come back, and even using salt away have only lasted 3 to 4 years. Peace from the Keys!

[@arthurgay5746]

@@KeysBoatingChannel my boat spends most of its time on the trailer. I never leave it in the water for more than a weekend at a time and I stay in freshwater.

[@roadjokers6467]

My manifold is filling with water my top riser gasket is fine does that mean I need a new manifold

[@KeysBoatingChannel]

Hi, thanks for watching our video. Some parts of the manifold and risers will have water going through, but if you have water seeping to the exhaust side internally this could be catastrophic for your engine. If your manifolds, and risers are used in saltwater and they are older than 4 years I'd have a mechanic replace them. Better to be safe than sorry. Hope this helps, and thanks for your comment! Peace!

[@roadjokers6467]

@@KeysBoatingChannel did the risers and manifold still got the same thing man

[@matthewhenneman9712]

A fresh water cooled engine only needs riser replacements, the manifolds last decades. Raw water cooled engines are fine in fresh water, but tend to be short lived in salt water.

[@KeysBoatingChannel]

That is correct, I've heard in fresh water is good over 10 yrs...Great information! thanks so much for your comment and support! Peace!

[@coreykuhl3079]

If I have a heat exchanger closed coolant system how often and what needs to be replaced?

[@anthonymartin1790]

The exhaust still gets sea water, only the block is cooled closed loop ​@coreykuhl3079

[@edwardwerthner7717]

Thx any other suggestions for,I/0

[@KeysBoatingChannel]

Hi Edward! Thanks for watching our video, and the following link is our playlist of boat how to videos, you may find other videos of interest. Thanks so much for your support! Peace! kzbin.info/aero/PLdGyBdjereVhr3ORJSkmsrvZdFZjogJN7

[@stuartthorne]

THANKS AGAIN I CHANGE MY RISER & MANIFOLD EVERY 2 YEARS I OVER HEATED BLEW MY 3 LT MERC UP OVER HEATING & PRE IGNITION NEW REBIULD $IIOOO AUS DOLLAR STEWY PEASE

[@KeysBoatingChannel]

Hi Stewy, welcome back to the channel. Yes, it's happened to me, and it's a difficult one...that's why I made this video to explain the importance of replacing the manifolds. Thanks for watching our video! Peace from the Keys!

[@KeysBoatingChannel]

Thanks for Watching! Hope this video helps others avoid catastrophic failure to their boats engine, before it's too late! This is one of the most neglected items in a inboard outboard engine, besides the impeller. Happy New Year 2022 to all! Blessings!

[@TheKillingFloor69]

What about for fresh water?

[@hildablanco1591]

If engine has fresh water cooling only elbows get replaced every 3 years but if it has a vaper lock system that drains it could rust and put water into your fuel system

[@KeysBoatingChannel]

Hi Hilda! Thanks for watching our video! I don't have experience with your type of system. My advice is to ask a mechanic or 2, or go to the forums of the type of boat you have and ask the question there. Usually they have mechanic's there that can help answer your question. My Take on it, any regular metal manifolds, risers, or extension that has fresh water moisture inside can get some rust, of coarse less than that of saltwater. Hope this helps, Thanks for your comment! Peace!

[@vdubluv222]

my boat is a 2001 bayliner. i've done the impeller only. never the water pump or any manifole. I'm taking this as my sign that i've been extremely lucky. it's time! I am 95% salt water all the time. I use salt away probably twice a year only....

[@KeysBoatingChannel]

Hi Troy! Thanks for watching our video! Hope this information helps avoid an Expensive engine replacement, and keep enjoying your boat for many years to come. Happy Boating! Peace!

[@vdubluv222]

@@KeysBoatingChannel thank you. I've known and maintained my impeller but that's it. I inspected my riser today and boy did I dodge a bullet! God is good! Thank you for your video!

[@KeysBoatingChannel]

You're very welcome! I'm glad this video helped prevent a costly situation. After you change all the risers and Manifolds...you'll be at peace knowing that you're good to go for at least another 4 years. Peace!

[@zarkobohacec3463]

I think it comes down to usage, storage, draining block and risers, hours on engine and where you drive the boat. obviouly salt weater eats everything. i got a 2006 and original riser i take it, all is fine only fresh water and nothing to worry about. check your impeller, check water flow, feel the warmth of the risers and outflow of water using muff. etc. you just had bad luck. Cheers

[@KeysBoatingChannel]

Hi Zarko, thanks for your comment...great information. Thank you for watching our video. Peace!

[@rron56]

Nice information from you you help us but in the music really you make a headach for me you don’t even need in the music when you are talk about the boat

[@KeysBoatingChannel]

Hi, thanks for your comment and information about the music...We'll keep it in mind for the next one. Thanks for watching! Peace!

[@KeysBoatingChannel]

Hi, we are re-vamping this video next. It will be available in a few days, and without music. Click here for our News info: kzbin.info/www/bejne/m5CliJuijMx_ntE Thanks for watching! Peace from the Keys!

[@SuperDcopeland]

I’m assuming this is only a salt water boat issue.

[@KeysBoatingChannel]

Hi Dave! Yes, mainly saltwater condition. There are many subscribers that have boats in freshwater environment reported to have their manifolds for up to 8 to 10 years. I don't know for sure because I have only saltwater experience. Thanks for watching! Peace from the Keys!

[@rdprdputube]

Switch over to a closed water system for all of you salt water boaters. Then all you need to worry about is the cooler at whatever the interval it needs to be changed. Quite a savings in a few short years.

[@KeysBoatingChannel]

Hi, thanks for watching, and your comment! Something to think about, thanks for your input. Peace from the Keys!

[@Nick_G7IZR]

I assume it's 3-4 years in saltwater and that freshwater will last a lot longer?

[@KeysBoatingChannel]

Experts say manifolds can last up to 6 to 8 years, 3 years in saltwater. In lightly used freshwater up to 20 years. But I would not ever take it that long without it least checking them every 4 to 6 years with a pressure test, and or inspection. What happens inside will never be visible from the outside, so its a guessing game. Checking it or replacing it can save you from a very expensive bill in the future. Great question! Thanks! Peace!

[@tomdavis8757]

Crusader. Enough said. Unless you like replacing manifolds and risers. Cheers

[@KeysBoatingChannel]

Hi Tom, right...can't do anymore manifolds and risers. I've had it. Brother thanks for watching our video, Peace from the Keys!

[@ThomasSellati-q2s]

Thank you it happened to me And I asked the mechanic how it happened he didn't know why terrible mechanic some are just part changers Eagle Marine in Delray Beach the worst mechanics and managers

[@KeysBoatingChannel]

Hi Thomas, thanks for watching our video! Yes, you can't trust anyone. You have to be present at all times to watch what they are doing, and then still they do a crappy job. Here's how we removed and replace our own manifolds: kzbin.info/www/bejne/e4fRapqmgtpgqrs Thanks! Peace from the Keys!

[@mysticvalley2003]

I REALLY hate to say it, but it happened to me....exhaust manifold riser internally became corroded blocking the flow of water within the engine. the water inside the engine boiled and the boat stalled out...we opened the engine hatch steam everywhere, it looked like the engine was on fire, scared the hell out of us. End results although the risers looked new on the outside they were total trash inside which destroyed the heads. Bought a new engine!!! $$$$ Sad part about it is an easy check. Now to people that want to buy a used boat over 5 years old....LOL good luck 97% of people don't maintain there boats per marine mechanics...When owning a boat expect everything can go wrong, manifolds, bellows, hoses, water pumps, electrical, etc...

[@KeysBoatingChannel]

Hi, thanks so much for watching our video! Wow, it's hard to deal with...lesson learned me included. Your experience will help others to avoid this issue, thanks! Peace from the Keys!

[@johnathanpeyton]

Would be a little easier to understand what you’re saying, without having to listen to music

[@KeysBoatingChannel]

Hi Johnathan, we are re-vamping this video next. It will be available in a few days, and without music. Click here for our News info: kzbin.info/www/bejne/m5CliJuijMx_ntE Thanks for watching! Peace from the Keys!

[@AAVIATOR481]

Good info... just PLEASE lose the background music!

[@KeysBoatingChannel]

Hi Andrew! We can't remove the music once it is uploaded to KZbin, but we will be doing an update video addressing this issue. Thanks for watching, and feedback. Peace from the Keys!

[@KeysBoatingChannel]

Hi Andy, we are re-vamping this video next. It will be available in a few days, and without music. Click here for our News info: kzbin.info/www/bejne/m5CliJuijMx_ntE Thanks for watching! Peace from the Keys!

[@guiller321]

Great vid. Wish you didn't add the dumb music or at least turn it way down...

[@KeysBoatingChannel]

Hi thanks for watching. This video has been re-made without the music...click here to view now: kzbin.info/www/bejne/a5fUn62Kgb6tpZo Peace from the Keys!

[@simondennis4047]

Turn the music off … it’s annoying and not required

[@KeysBoatingChannel]

Hi Simon, we will do a remake of this video adjusting music. Sorry! Thanks for your input. Peace!

[@KeysBoatingChannel]

Hi Simon, we are re-vamping this video next. It will be available in a few days, and without music. Click here for our News info: kzbin.info/www/bejne/m5CliJuijMx_ntE Thanks for watching! Peace from the Keys!

[@gillewis6666]

You have good information if I could hear you but you think having music playing louder than you speaks helps??? Ummm no!

[@KeysBoatingChannel]

Hi Gil, we will be doing an updated remake of this video. Sorry.

[@gillewis6666]

@@KeysBoatingChannel that’s great I watch your channel and content is good.

[@KeysBoatingChannel]

@@gillewis6666 thanks so much for watching, and your support. Peace!

[@KeysBoatingChannel]

Hi Gil, we are re-vamping this video next. It will be available in a few days, and without music. Click here for our News info: kzbin.info/www/bejne/m5CliJuijMx_ntE Thanks for watching! Peace from the Keys!