SILICONE FOR CRACKED EXHAUST MANIFOLDS? Does it hold and Why do manifolds crack

[@NoNonsenseKnowHow]

On Amazon: *PERMATEX THE RIGHT STUFF: amzn.to/2XXsJLY *SIERRA MANIFOLD FOR 4.3L MERCRUISER: amzn.to/2AiXQ9Z

[@kenchipley5645]

Thanks! Got a 91 Sea Ray 185BR w same engine. After 26 years of only draining manifolds, block and PS cooler, I finally got bit by a rust blockage and freeze damage on both manifolds. I read that manifolds are a replacement item on a five year cycle in salt water. I only use on fresh water but after 29 years It was probably due. I used your Permatex technique as a temporary fix so I could sort out carb problems. I filled the repaired manifolds with water on the bench to test. Had a leak on one and added more sealant. They hold about 48 oz of water. In future I will use the RV antifreeze flush after drain. Will replace manifolds if no other major problems arise.

[@NoNonsenseKnowHow]

Awesome, glad to hear you got it sorted out and thanks for sharing your story!

[@guglielmodicarlo4139]

I once purchased a boat with big blocks and one of the exhaust tubes was leaking pretty good, what I did was I made like a cast out of cotton and soaked the material with silicone and wrapped it up like a champ, it never leaked all the way hone, def not the right repair , but in a pinch it worked out for three days, I motored the boat from MIami to Ft Myers and no leak, so yeah I get it,, works good enough in an emergency situation

[@josewales892]

Dude, i’m gonna try this, i tried extreme heat jb weld before seeing your video and it came off in minutes, i have same manifolds and almost the exact same crack size and location. I had a freeze plug pop this year and had to remove manifolds to get to it to replace. someone had globbed black stuff all over it before i bought it and it looked years old but wasn’t leaking but i thought while i have it off i’ll sand it down, clean it up and try some extreme heat jb weld. after doing so and it failing i began to wonder what the stuff i had just ground off was and why it was holding so well after what looked like years of being on there. i’m guessing it was probably this exact stuff you’re talking about right here…anyway, thanks for your time and knowledge and for making a video and dumbing it down for rookie boaters such as myself….👍🏼👍🏼

[@NoNonsenseKnowHow]

Yeah man it might be kind of hacked but that permit takes the right stuff holds up really well! Good luck on it. The best fix is to replace the manifolds of course.

[@josewales892]

@@NoNonsenseKnowHow yeah i mean if it lasts a few times out on the lake this year till i have the money for new manifolds then that’s good enough for me

[@josewales892]

can i just fill the crack or do i need to smear it all over like you did?

[@RileyTheMonster299]

Thank you you got me sold on it. I'm getting it mine has a small crack in it and I'm new to boating. Do you wire wheel The crack clean before applying? This should work for me minor nowhere near as large as yours are as far as the crack. That's exactly what happened to me I bought it from someone and they were cracked. I haven't seen a hole in the block but fingers crossed. I would just be happy for one season with it. Before I have to pull the motor and replace it. I know when I replace it I'm going to get creative. Boat motors are expensive. I was thinking about trying A V-Tech 4 cylinder. Or something similar? Something that can take a whole bunch of abuse. I know They're not exactly made for a boat. But Hey I bought the boat for 300 bucks from a friend with a title and a really nice trailer trailer's probably worth a 1000. And the boats really nice too other than the motor problems. He even just rebuilt The prop drive. I have all the receipts and everything Well he didn't do it he had a pretty reputable dealer do it. He spent almost $2000 doing it and after the exhaust manifold's cracked correct he was just over it. So. A platform Toy For experimenting it is

[@bridgetf6833]

Thanks you!!! Straight forward and quick information!

[@kalaganne]

Yo NNKH, not sure you’ll see this thread but I’m about to get a Sea ray from 87’ equipped with the 3.0 140hp mercruiser and the seller says there is milk and the cylender top that just need to be carried out. What’s your thought on this and what would be your advises in order to inspect the real issue? Thx 🙏🏻

[@NoNonsenseKnowHow]

Usually if the oil is milky at all it means blown head gasket or cracked block. Sometimes if a vehicle was stored for a long period of time condensation can get in and a little bit of milkiness can be normal but not usually the case. With boats it means a problem

[@zatrogamer]

Good idea! I want to try the same with my exhaust manifolds. How much Permatex The Right Stuff did you use? I see you linked a 5 oz tube in response to one of the comments, but I feel like you used more than that. Did you use two 5 ozs or a 9.5oz or something?

[@dennisbergmann1722]

Sir, will those new manifolds for a 1983 Chevy 454 big block? Thanks.

[@richardsteve6044]

Question, can that cause the water to mix with the oil?

[@willtheway98]

Awesome video!!

[@AB-nb2ic]

Good video. Liked and subbed, anf commented for traffic 👍

[@NoNonsenseKnowHow]

Thanks

[@treyroseburgh4129]

If you take it to the shop how much will it cost?

[@MrTVBOi]

Great video !!!!!!!

[@meyers027]

Im surprised it doesnt melt off, do boat manifolds not get that hot then with the cooling in them? Did it give off a smell

[@NoNonsenseKnowHow]

Zach meyers the right stuff is rated for I think around 500 degrees, but it can take more. However boat exhaust manifolds only run around 170 degrees or so. No smells whatsoever!

[@BrandonCarroll1]

Video was extremely helpful, I appreciate the time you spent. Quick question... The Right Stuff you used looks black, but most of the high temp stuff on your amazon link is RED. Can you tell me the # of which Permatex you used? Thanks!

[@NoNonsenseKnowHow]

Thanks for the feedback. Permatex the right stuff black is the stuff to use. There is a link to it in the description of the video

[@NoNonsenseKnowHow]

www.amazon.com/Permatex-29208-Right-Stuff-Gasket/dp/B000HBNV8U/ref=mp_s_a_1_5?dchild=1&keywords=permatex+the+right+stuff+gasket+maker+black&qid=1621713306&sr=8-5

[@NoNonsenseKnowHow]

And remember this is only a temporary fix.

[@BrandonCarroll1]

@@NoNonsenseKnowHow Thanks! I've already ordered the replacement manifolds, etc. I just figured for ~$10 or $15, I was going to give it a try just for the experience while I was waiting on parts. I'm new to boating, so the more I learn during these unfortunate events, the better prepared I'll be for the next 'oh crap' moment. Thanks for the reply!

[@factsdontlie4342]

@@BrandonCarroll1 Haha, while owning a boat you will definitely have a bunch of "oh crap" moments. Our boat sees more work than all of our cars combined.

[@coltacp8451]

i am completely clueless when it comes to boating my question is why do they run water through the exhaust manifolds on boats? cars don't do that.

[@NoNonsenseKnowHow]

colt ACP great question, I probably should have explained that in the video. The primary reason is is to keep the engine bay area temps down. Unlike a car, the engine bay on a boat gets very little air flow and exhaust headers can run red hot when under load. So yea basically to avoid fires and keep the area cool. Also, the water is injected into the exhaust at the risers. Mainly to cool the exhaust coming out and also reduce noise.

[@coltacp8451]

ok that makes sense. that stuff is pretty amazing to seal those cracks

[@NoNonsenseKnowHow]

colt ACP yeah man for sure! I keep a can of the right stuff in both of my trucks in case of emergency repairs. It was originally a German engineered silicone, and Permatex bought it

[@coltacp8451]

i wonder how well it gets along with gasoline, they have a solvent base silicone that is supposed to work well with fuel i seen somebody on youtube saying it plugged up his main jet on his bike trying to make float bowl gaskets lol

[@NoNonsenseKnowHow]

colt ACP I've used it a couple times with gasoline and it definitely doesn't do very well

[@cjstuntz8884]

Wouldn't welding it be better?

[@NSoutdoorsman]

I expected such a shitty video. Then you said no nonsense so I was like okay I’ll watch. Ended up being a great video lol trying to learn about these 4.3’s. Just bought a celebrity with one in it

[@NoNonsenseKnowHow]

Lol. Yea mostly No-Nonsense on this channel. Appreciate ya stopping by! 4.3's are good motors.

[@stevewest5351]

Replace the manifolds!

[@NoNonsenseKnowHow]

No need unless they're rusted out

[@chengsong1027]

Funny

[@jimbradley727]

No please no...buy some manifolds as the cooler your engine the better.. Broken manifold...trash can...

[@NoNonsenseKnowHow]

Worked out fine never caused a problem. Save money recycle reuse