Cracked Engine Block - Will JB Weld Fix It?
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- Опубликовано: 9 фев 2025
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The engine block on my Bayliner boat cracked over the winter. We was getting it ready for the lake when we discovered this. I did a little research and quickly realized that I could not afford to replace the block. So I tried JB Weld. There are some people online that claim it will work and other claim that it won't. I'm sure this is not a recommended procedure, but I am going to give it a try to see if it will fix our block or not.
I have also moved this video to my other channel - Car Addict Garage - • Will JB Weld Fix A Cra...
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Donnie Smith do you do collision repair for work? You mix the jb weld like body filler lol..
My JB Weld story: It was early 80's and I had a Saab 99, which preceded the 900. The harmonic balancer broke off in the winter, here in Alaska, and it was a nice clean break. The break in the balancer indexed very well to the end of the crankshaft, so it was a very good alignment, so I spread on the JB Weld, propped it up to hold it solid and put an electric heater on it all night. I drove that car for over a year before I sold it, and never had a problem.
I repaired a Cummins ISM cracked block with JBW behind the engine starter on driver side That was 4 years 215k miles ago and the engine still running strong without leaks. Awesome product. I strongly recommend it.
This stuff, in my opinion works great even as a permanent repair. I have used to repair counter bores on diesel engines, intake manifolds and such. Wonderful product! Very nice job cleaning the area Donnie, you will never have any more problems with that crack due to JB weld failing!
B s u havent applied it were oil pressure iz
I used JB to repair my crankshaft on my 350 chevy it held fine even though i'm running 100 shot nitrous.
I also used it to repair my wheel hub ,I did that 10 years ago and I run over 150 mph works great.
I also blew out a clutch on my work van but made a clutch out of jb weld.
I couldn't afford to fill my daughters tooth cavity so i used Jb weld
Jb weld is life , i got back with my wife because of jb weld
I haven't seen my son in 5 years
+bugatti veyron LOL hillarious
I was believing every word you said until you said van and clutch. DOH
Jeff Fleischman LOL
bugatti veyron I made a clutch disc out of jb weld for drag racing.
It grabs great.
You should try one in your Bugatti veyron.
dude that is the funniest shit my stomach hurts from laughing
Most boats’ cooling system are not a closed system so it doesn’t build up pressure like a sealed cooling system with a radiator or heat exchanger so JB Weld will work just fine.
My father-in-law JB WELDED an engine block on a tractor,it was cracked all the way down the side,it has held now for over 25 years now.If I remember correctly,he put it on in layers letting it dry in between each layer.
Tim Ballentine Wow…25 years, that is good to know. Thanks for letting us know.
+Tim Ballentine MAN THAT A BLESSING IM
Que Bridges Amen,it sure beat having to buy a new engine .
+Donnie Smith 497 years ago I fixed the crack on the Spanish Titanic using JB Weld,with the iceberg going through it,and never had problems since. The boat just passed its tests and I will have a party on it,for my 840 birthday.
And by the way,a piece of the iceberg is still stuck in the boat. J B Weld helped to keep it intact. inside the iceberg,you can clearly see some oysters,an old boot,and Pamela Anderson's great great grand mother knitting bikinis for then Baywatch!
Tim Ballentine I have a blown engine block do you think it would work
I have a1990 Dodge Dakota 4 x 4 that I have converted into a tractor, it sees hard service. I didn't winterize properly either and ended up with a two in crack just under the exhaust, I cleaned it up and cut a groove in the crack..BUT, the difference in the way I made my repair was that, I applied a VACUUM to the engine VIA the overflow "TIT" on the radiator. I let it pump for about an hour, then I applied the JB WELD, let it keep pumping for another 20 minutes, it pulled it right in, I think that enough JB wasa pulled in to equal the block thickness . I have sice tried this method on several other engines including Marine Engines. It works great, all you need is access to an AC Vacuum compressor. This way the JB is pulled intto the block and not just "stuck" on the outside like a "patch"..and this method works with other Mediums besides JB WELD.
Regards ,
Boyd E. Falk
+Boyd Falk That's a damn good idea, on the vacuum pump!! The block cracked in my diesel pickup and I'm going to try your method because I've got a vacuum pump that I use for A/C work. Thanks for that idea!
Let me know how it worked out for you, I still haven't had any problems.
We simply drill small holes at both ends of the crack, grind out a deep V groove, and stick weld it with Nomacast. The secret is only doing 3/4"-1" at a time and waiting a full minute before doing another 3/4"-1" section. It works every time and we've never had a problem.
Had a ford ranger with a cracked block.... ran 57,000 more miles after applying it. It held up and trust JB weld. Now, not all cracks are the same and other cracks in different areas will be different. My crack was at the driver side above the manifold right over the number 1 exhaust port. We also drilled and bottom tapped two holes and placed a steel plank to help with expansion. I know that was probably 95% of the fix, but the JB weld held it all together. It works.... just not with a piston hanging out of the engine lol
Was very skeptical. Recently I was challenged with the same issue. Crack was horizontal with the cylinder head and about 9 inches long. No water in the oil, ran like a top. Opened up my crack a tad more with a dremel, stop drilled the ends with a #30 bit, cleaned the area with a cup wire brush on a 4" grinder and wiped the area down several times with acetone. I applied one coat with a putty knife pushing it into the crack. Waited 6 hours and applied another coat over the area. To my surprise, it worked like a charm with no leaking whatsoever. I'm currently looking for a replacement engine as I'm not sure I trust it just yet but, it did the trick. Thanks for the video.
was water actually leaking out of crack?
You still running
Its all in the prep. Clean clean clean! I used it on magnesium motorcycle cases after I threw a chain. It lasted 10 yrs on a motocross bike ridden hard.
I have repaired a couple of 400 sbc race blocks with JB Weld and it worked very good. The engines had about 650 hp N/A and 300 hp of spray on them. They lasted for a few years each before a different issue put them out of commission.
That's what I'm going to use it on a 400 small block 598 horse power very slight crack..hope it works
@@ronkush69did it work?
I have used JB Weld on the cracked alloy sump on my VW: has lasted 8 years so far and 100,000 miles. Otherwise it would have been an engine/gearbox removal to get the sump removed for welding. Only thing is that the surfaces must be 100% clean and roughened.
I just complete engine, and aftrr two coats of jbweld it holds good on crack when tested at home.So am taking it to a lake for little longer run and see how it will doo.. thanks for the video
I did same repair in my boat , it held up 2 years. I’m currently removing old to replace with new JB. It beats buying a new motor
I'm dating myself, but in the 60's and early 70's Ford sold a metallic epoxy that was very much like JB Weld for dealing with porous castings like engine blocks and cylinder heads (external coolant leaks mostly). Ford never advocated patching cracked castings with it, but there were instructions on using the epoxy properly in the factory service manuals. Improvements in casting technology have pretty much eliminated the need for things like this. Nice test. I'm not a huge JB Weld fan, but I'm glad it's working for you.
scdevon Thanks for watching!
A good friend of mine used JB Weld on the block of a Ski Natique boat and I've never heard any complaints from him about it since. He finished using the boat that summer and then sold the boat.
Mine is still holding!
Back in 1986 my dad let his tractor freeze up. an old a/c it cracked the block on the side about four inches long I cleaned it up real good an ground a little right in the crack.i cut a little line at each end of the crack an filled it in with jb weld it never leaked again an he drove it another 20 years still holding when he sold it in the auction.
Trust me I'm a believer just take the time to do a good job on the prep work an it will hold it's amazing.
When I worked for General Motors as a tech. in the transmission shop, we would often have a cracked governor case and GM had a weld that we used and it really worked good. it was grey and took 24 hours to dry. it would hold trans. fluid and heat and pressure. It was also drillable and could be threaded if needed. Just in case that fails you have another option.
That is good to know. Thanks for sharing!
great to know Chevy rigs it's vehicles to sell them
Brian Snyder what was it called
and they prob charged the same price as a brand new one ....
I fixed mine drilled out both ends of crack worked for years sold. BOat still running great
Thanks Donnie! great video, I'm getting it right now to put it on a small engine crack on my Goldwing.🤞🏾Take care!!!
I am doing the exact same repair on my 86' 305 Mercrusier. Thanks for the great video!
Mine is still holding!
@@DonnieSmith7 How long did it hold? Surely it cant still work fine?
Hi Jimmy, I hope it holds out for the summer too....if not, my boys are going to be sad....lol Most of the wheels came with the kit I bought. I had to get the 90 degree attachment separate. This was my first time to use one, bit without air tools, it performed well. Thanks for watching! Oh, in case you're wondering, I found this tool and attachment at Sutherlands Lumber Store!
I’m going to give your repair idea a try I’ll let you know if I have questions. I have two cracks about 5 inch top to bottom to each other. One 13” long and the lower one is 7” long lol.
Donnie thanks for this video. Bought a Bayliner in Wichita Kansas last summer and only had time to use it once. Then when I took it in for winterization this fall. The mechanic told me that because there were new freeze plugs installed, I probably bought a boat with a cracked motor. This statement was given by assumption, not by visual. Can't wait for it to warm up to check. And if crack is found, try your technique. Hopefully it will not be cracked. But if it is, this could save me the cost of a new 454 Mercrusier. Wish me luck. Will post results.
Jayme Fowler I hope it is not cracked, but the JB Weld is still holding on mine.
Donnie Smith Looked like it was still leaking at the 8:36 mark in the video
I have read a lot of articles about this as I too have a cracked block on my boat. A lot of nay sayer's, but you know what? Not one person has stated they have done it and thus had any ill effects. Only people who advise against it and recommend replacing the block. My question is why not try this if your engine is fucked your engine is fucked, right? I could see if you were going to take ur boat 50 miles out to sea. But for lake users... why not? Again, not one person saying that they used JB weld and it turned into a catastrophy. I did my boat today. I will report on how well it worked after I start it up tomorrow evening.
Really, it's like what have you got to loose? What? is it going to ruin your already cracked block?
+zenarrrow Well in this case no news is bad news. Must have cracked inward. FYI no water did leak from the cracks themselves, but the dipstick showed water and foam. Engine ruined, just hope I can reuse all the other parts to amend to the new block. Reporting live - this is zenarrow for 420 news, back to you SuperBlenderBlade
I used it worked great my crack was about 3 inches same spot area
Hi Donnie my brother and I just fixed our truck motor with jbw we hope it's going to be all good thanks
I used this stuff today for the first . I thought yeah right big claims etc . But it is really strong , I have no doubt it would hold up on an engine block . And it sticks ,there's no way you would get it off without grinding
I hustled wanted to say thanks for posting! I did the same thing after watching this video and it worked. Because of the video I also found the upper leak also and was able to get that one also. Any updates as of late?
Hi, from Argentina, I have a Mercury 135Hp 2-stroke with a crack in the block.I want to try fix it with this product. You made it un 2013, how is now de engine?.-
Thanks for the video. I forgot to winterize mine last winter. And today is 90f outside and am doing block repair with jbweld. I folow your work and i hope it will work. Exept i had another crack right under manifold so i had to take if off so i could repair crack. I hope it will work after i do another coat of jbweld.
did your repair work
it stil leaks, i see the water drops in the video, is that taken after testride or? or when u discovered that new leak?
That engine is more shaky than my grandpa lol 😂
@6:50 so he used 2 coats of the JB Weld. Are you supposed to do this?
Vina Kane it probably doesn’t hurt
Hei Donnie, I have a similar crack on my car's disel engine (150 hp). The crack is smaller than that and is on the coolant side. Do you think it will do the job?
Thanks for the detailed video.
I've had a lot of people message me after I made this video and they said it worked for them too. Mine is still holding strong!
I did it on my sear ray 2002 Sundancer. Cranck block, it worked!
Anyone have an update on how long this held? Looks like after our killer winter in Texas I’m gonna be trying this.
It help for 5+ years and we skied and tubed a lot every summer. We moved last summer and had to sell the boat. It is still holding fine.
AWESOME !!!!
My son just recently busted his new RC Truck he got for X-mas :(
But thank God, all the parts are replaceable !!!
The Pieces he busted need to be able to handle a bit of torque & strength !!!
After seeing your Vid & others, I have no doubt that JB Weld will do the trick till his new parts come!!
& if the hold up, I may just leave the fixed parts on till needed !!!
Thanks 4 Sharing Your Experience Using JB Weld !!!
I tried using JB weld on a CAdillac Engine to seal a crack. I ever poured it insode of the water jacket to seal it from inside and then also applied it on the outside. As soon as the engine got hot the JB weld cracked and started leaking. ALso i did all the preparations necessary for JB weld to stick well to the surface.
GO check out Belzona.com. Their 1111 Super Metal and repair procedure will fix cracked engine casing...
I've a tiny oil leak which I think I've found where AC compressor is bolted to crankcase . Just changed my oil and filter . I'll make sure before trying anything . Tiny since I think it goes down very slowly just annoying . Yeah I hit something very hard . Possibly a problem if it still leaking when I try using permex / JB weld grey or black glue since it's supposed to be clean and dry ? Any helpful experiences out there ? Do I have to wait till I drain it during my next oil change ?
Did it last more than just 3 times out ?
Was that El Dorado lake you were skiing at?
I had a casting defect on a cylinder wall on an old ford tractor that i repaired with jb weld. it was a pinhole, and i was able to get to it from the backside. havent had any problems
My 350 sbc block cracked below exhaust about to fix mine the new k&w lime green bottle to run through coolant works great but I'm not big on mixtures in my motor good luck
Hey Donnie,
Great video-did all the drill bits and grinding wheels come with the 90 degree Dremel attachment? I hope the repair holds out for your summer on the lake.
I had a cracked block on my tsx tried JB weld lasted about one hour tried belzone 111 the best stuff out there did not work replaced the engine ooouch! if the crack is under pressure(oil) it will not work as it was in my case.
I worked as a aircraft mechanic, and we had a plane with broken off propellers and guess what? We JB welded those bitches right up and worked like a charm
I am gonna have to do this on my boat as well, my only concern is hoping it did not crack inward as well.
86 people saw this a failure , seriously is it permanent>?
Curious to know if it's still holding. If you ever have that issue again try marine tex. I have a back up race motor that ran 2 seasons with a huge patched crack. I'm about to do it again and run that motor the rest of this race season as well. I assume it works great it held up to the abuse of racing.
justin stevens Yeah, it's still holding fine. We've been to the lake skiing and tubing quite a bot again this year. Thanks for letting me know about the marine tex, if I should need to do a similar repair again.
when your engine block cracked there was it also putting water into your oil and in your pistons? cause mine is cracked around the exhaust manifold and i had milky oil and water on top of my pistons need to know how serious mine may be i know a technique on welding cast iron properly but before i go into welding it and sealing it i wonder if mine has a more serious crack than it appears
it probably is pretty serious. the way I look at it man. it's already fucked, you can't fuck it any more then it already is.
i'd give the jb weld a shot first even though it's gonna be putting A LOT of heat to the adhesive. if it works, you win. if it don't then try welding. with my experience on welding iron, it's hit or miss depending on the quality of the iron no matter how you attack it, you could end up with more cracks then what you started with. jb first, then go ham with actual welding
Put 3 pack of JB into the cooing system and 3 into the crank case. Run it at operating temp until it stops.
How would that work...assume you're kidding. I replaced a clearly leaking manifold but still getting water in my oil. Assume cracked block. How would jbweld on the outside of the block help at all with water mixing with the oil?
At 8:38 there is still a leak.
Ryan Toomey He says right in the video that there was still another leak from a different location, but the repaired leak was fixed.
The manifold in my 96 Honda Civic has a 3 inch crack. I won't be able to replace it for at least 30 days. Would JB weld work?
absolutely, as long as we are talking about the intake manifold
3 INCES LONG OR 3 INCHES WIDE?
Bryn Comeaux IT'S LOUD IN HERE; ISN'T IT???
Just bought a 1997 bayliner 1950 Capri with a mercruiser 3.0 with a crack in exactly the same spot. How did this hold up for you?
Burl Nicholson I have this exact same boat and just discovered a crack on the block on the same side. I have a lot of corrosion on the side (my boat is in salt water a lot). Have you attempted the JB Weld fix?
***** I took the boat out for a test run at the lake to get it hot and see how bad the leak actually was (before attempting any repair) ...after an hour of running it hard ...the block never leaked on me...So I have not put anything onto the crack. But it is highly visible and no doubt that it has leaked in the past...I may just go ahead and get a head of it... Clean the crack line with a grinder and give it a good coating of jB weld...until then I dont have any way of knowing if it will actually do the job or not. I Have had people tell me they have driven their boats with cracks like this for years and even when it leaked some,..as long as the pump works, go ahead. haha crazy but I wanna try and make it sound again for little money and time if possible. Worth a try I will report back once I get it done.
Burl Nicholson Right on thanks for the report. I ended up doing the jb weld on the hole in my block and took it out on the bay on the 4th of July. I didn't run it hard or long but i checked on it frequently and it held! i'll keep you posted on how she holds up next time i run her hard and hot. Thanks for your update. I'm wondering if there was an issue with the casting of the block on our model.
***** thats great man!
I wonder the same thing too. I have read in a few forums several others with exactly the same crack.
Hope the jb holds up. not planning on taking mine back out for a few weeks.. when my son comes home on leave.
but we will give it a torture test no doubt. God Bless and stay safe sir.
You too Burl! Have fun and good luck...hopefully the crack will never leak!
Hi, what was leaking from the crack? coolant or oil? if oil please let me know if it's pressurized area or just under crankcase pressure? thank you for the tip, gonna try this and hope this gives me a few months until i replace my engine
Neither. It is a water jacket under the cracked area. They freeze over the winter and crack, if not drained properly! Theres not much pressure here...maybe 10 psi max
yea you shouldn't have any issues out of it. thats how i fixed the 283 csb in my truck and it has held up for 10 years
Trying to do o2 sensor bungs and I was curious if jb weld will be strong enough to mount the o2 senor bung to the pipe?
How long was the crack would you say? Awesome video and thanks for sharing!
I was 12 inches or more.
@@CarAddictGarage impressive! Mine is around 8" anxious to try out what you did this weekend. TY
sodium silicate is the best thing to use run it for a day or two and it will seal the crack flush and fill and forget the crack
What is and where do you get this sodium silicate
Just had this happen to me bought a boat this way and now I have it cleaned taking it to a welder if he can't do this job it jb weld time still running strong I assume?
Geoffrey Fredrickson Yes, still going to the lake. Good luck with yours!
You got lucky. there's about a 1 in 10 chance (probably less than that) of it working and holding up.
J B Weld repair on K13 nissan diesel block, Extensive prep, laminated several layers. used 4 tubes. Failed
was water actually leaking out of this crack?
How can I purchase it from where
How did this hold up?
milky oil before and after repair?
hi donnie,
my name is mark and i watched your jb weld video out of interest. nice looking job. the video shots looked like falls lake, north of raleigh, nc. just wondering if it was. good work.
mark
This stuff is AWESOME!!! Just dont trust the QUICK drying version. Isn't worth a damn. I've used JB weld on LOTS of stuff. Including... gluing a radiator back together on an Acura Integra that overheated and busted. The JB weld held so great.... the car overheated again weeks later.... but the radiator busted in a totally DIFFERENT spot. The JB weld held while radiator overheated with extreme pressure that time!!! Crazy stuff for sure!!!!
i like the metal in the backround
I'd use steel wool or powdered iron with jb weld depending on hole size .
What does the powdered iron or steel wool do when mixed with JB weld?
@@Mustang9831 rusts up used kb sealer was before jb weld was made .the jb 5 doesn't have as high a hardness of temp
Would this work on a cast iron intake manifold? And should I drill the ends of the crack to prevent it from spreading?
***** I haven't found out as far as the JB goes. But many people say they wouldn't use it on intakes just in case a piece brakes off. Don't want it going into the engine.
Is it still holding? And was that an aluminum block?
Yes, it's still holding. No, the block is cast iron. I am not sure if it would work on aluminum.
funny to see the same crack as my boat lol How long has it lasted?
Austin E Found your other video from 2014, thats pretty awesome I was about to just say screw it because the crack i have is so long. If you dont mind any tips on winterizing this engine. Thanks again for sharing. Now its time to pull the head and fix the bent valve!!!
Austin E It has been 3 years I think...2 or 3! We go to the lake a lot during the summer too.
Hey, Its been three years since you posted this video. Hows it holding up? We all want to know.
crickets chirping.....
year later a tumble weed rolls by
Engine Blew up , boat cought on fire from the JB weld .
I seen Them at the lake swimming to shore.
Wish I could have used J.B. weld when I cracked the block in my Mark Twain but a valve stuck open and the piston hit it and it cracked the block like a broken watermelon . The valve was the size of a half dollar and it was stuck half way into the top of the piston . The mechanic that replaced the block said he was keeping it cause he was only charging me a little over a thousand to replace the block and it was the worst cracked block he had ever seen and the piston was going on his desk as a paperweight . Never buy a boat with closed cooling if you can avoid it .
Regular jb weld or the blue tube marine jb weld???
Jb weld will repair ANYTHiNG if you use excellent preparation. It's weakness is vibration but on large rigid surfaces or on small broken parts it will last beyond the years you sell the vehicle/boat.
with my mower the reason it has a small crack my engine mount vibrated loose, maybe check your they do vibrate alot
did same to mine works great
How long did it end up holding up for
Is that a matchbook putty knife? That's awesome. I always have a hard time coming up with something disposable to both stir and apply. I just saw another video that recommended a disposable snap-off razor. Thanks for posting!
🤦🏼♂️
Any concern about the JB Weld getting inside via the crack? I need to repair an OB gearcase, don't want to get any of it onto the gears themselves.
is it still holding?
Wow...that is good to know! Maybe mine will last a few years. If it works on a 650 hp, than I should not have a problem. Thanks for letting us know about this!
I had a friend that had a rod knocking in his car and it had done ate up the crankshaft so he took the quick steel epoxy and put it under the new bearing and torqued the crankshaft back down and it has been like that for over a year , I have tried jb weld before on stuff doesn't hold we'll under pressure if I were anyone fixing cracks on the blocks I would remove and leave out the thermostats that way it will never run much over a 100 degrees , and try the quick steel !
Thanks for the tips....I have not tried quick steel!
Is that Milford Lake?
The guy attaching the hose to the water ears ;)
omcdude64 yea he was trying
Just pulled the boat out and saw the EXACT same crack....I knew I forgot to do something last fall.
Mine is still working fine this year. We had the boat out the other day!
Looks like I dodged the bullet as well.....repair worked and oil is stayin oil.
JB Weld obviously threatens some people's ego....
"I would never use that crap!"
Fine don't, but don't knock everyone else sharing something that has helped them out of a bind.
plus i work on motors i put j.b.on the part to be fixed not the paper.
How’s it holding up
So its partially drilled right? Not all the way?
Thanks for sharing mate!
Got two fixed that way been holding for 7 + years
Its standard issue for astronauts. Saved many a space mission and countless lives.
is it leaking from the heat exchanger?
Good job
Can JB Weld used to fix a scored piston skirt ?
thats what happens when you dont winterize your engine
No, it is El Dorado Lake!
How long did the epoxy stay on your fingers? Uh... gloves?
If you wet your finger it don't stick..and it makes a much nicer looking repair..
That makes me confident...i'll try it on my 18 hp lawnmower engine...finding a new engine absolutely sucks since it seems that there not many of them out there in the www...its funny ...every fucking may either my car lets me down or something else that i need every day..my stuff hates me
looks like it still leaks (8:38 into this video)
He CLEARLY says that the repair does NOT leak, and he suspects another leak somewhere else. Have your doctor check your ears for wax...