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Author Topic:   cracked block
Dirt Maniac

Total posts: 123
posted April 24, 2005 08:59 PM  
a buddy off mine has a 350 block that did not get all the water out over the winter and it put a small crack in the bottom near the drain plug it did not hurt the inside of the block just the outside has anyone ever heard of welding it or is it junk?? if it can be welded would it be reliable??

Weld IT!!
Dirt Roller

Total posts: 11
posted April 24, 2005 09:10 PM  
U will have to clean the area really good and then weld it with nickel rod.

Weld IT!!
Dirt Roller

Total posts: 11
posted April 24, 2005 09:11 PM  
my bad u will also want to v-out the crack then weld it.

Dirt Maniac

Total posts: 123
posted April 24, 2005 10:14 PM  
thanks he was just goin gto use a mig welder and slam it on there and hope it held. do u have to get that rod some where specal??

Dirt Maniac

Total posts: 165
posted April 25, 2005 08:02 AM  
You can use a stick welder to do it or you can use a tig welder. I welded one a few years back with a tig and it held fine. You need to preheat the area before you weld it and then stress relieve it by tapping the weld with a blount object like a ball pean hammer. Go to a welding supply shop and thell them you wanna weld cast iron and the will give you the rod you need.
Hope that helps.

Dirt Maniac

Total posts: 111
posted April 25, 2005 08:24 AM  
JB Weld! On the outside of the block it will work great. Grind down a little pit for it and rough the surface up some first. Much easier and most of all will last just as long.

-stand on it-

Dirt Full Roller

Total posts: 31
posted April 25, 2005 09:43 AM  
i agree jb welded one and lasted over a year
before i threw a rod.

Dirt Roller

Total posts: 9
posted April 25, 2005 10:45 AM  
I had real good luck with Belzona. It is like JB Weld but better.

Dirt Maniac

Total posts: 137
posted April 25, 2005 04:05 PM  
I would not weld it and Im a welder.

Jb would be the easy way.

but there is better call a boat shop and ask them about cast iron repair stuff, its used commonly in boats because they circulate fresh water through the motor and it rusts etc. It is better than jb Ive got a bottle of it here and can look for the exact name if needed but I found it at the first boat place I called when I was clearancing a block.

Dirt Freak

Total posts: 477
posted April 25, 2005 04:33 PM  
thanks alot guys i was talking to a buddy that races with us today he is a welder and he say to v it out and JB weld it and there is alot saying the same here so i think thats what we will do thanks again all

Dirt Roller

Total posts: 20
posted April 27, 2005 06:00 AM  
You should always drill 2 little holes. One at one end of crack and one at the other. this stops it from cracking any farther. Then grind a groove in the crack(better penetration) Always preheat the welding area before welding. I have done this on many occasions and the steps above are from experience.

Dirt Maniac

Total posts: 123
posted April 27, 2005 09:52 PM  
well we got it all goopped up with JB yesterday and we fired it tonight it seem to be holding and wow dose it ever sound mean cant wait to get the car to the track sat for the season opener. we both missed test and tune tonight but oh well.


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