Small Crack in Block Repair?

[bax]

New block! F that crack.

 

[bax]

OK you guys are going to think I am nuts but this is what I would do. First off the crack is ini the very bottom of the block as far as water goes. Fill the first inch of the block with Hardblok block filler. It will seal off the area where the crack is. No water no leak.

 

[Broncobowsher]

Easy fix for a pinhole (which won't work here)
Place a vacuum pump on the cooling system (that cheap harbor freight A/C one will work fine). Pull a vacuum and put a little JB weld on the hole and let the vacuum pull it through. I did this on a porus casting once and had a half dozen beads ov JB weld sweet on the inside when done. Whip smooth, let cure. Fixed the porus pinholes.
Too bad that won't work for a crack.

 

[bmc69]

OK you guys are going to think I am nuts but this is what I would do. First off the crack is ini the very bottom of the block as far as water goes. Fill the first inch of the block with Hardblok block filler. It will seal off the area where the crack is. No water no leak.

Yep. That works too.

 

[bmc69]

OK you guys are going to think I am nuts

OK. I'll bite. That would be new??

 

[bax]

I couldn't think of anything serious to post in this tread.

I thought this was funny

 

[73azbronco]

I'm with the JB weld crowd, drill the end of the crack, use a dremel and v notch the crack to the threaded hole, then JB weld the hole and crack, I would leave out the brass plug and just use jb weld. If you read the jb weld site they have some pretty amazing success. All else fails, get a new block.

 

[blubuckaroo]

That may be an option sometime in the future, but the engine is installed with the final touches being finished now.

I know it's heartbreaking but we all have to backtrack sometimes. Since the assembly isn't complete yet, now is the time to do it right. Good luck with your fix.

 

[Mike.thespike]

what is the plug for and if its possible why not drill a bigger hole tap that and be done no welding no fuss so you got to put a 1 inch plug in but it will be done with out welding all hand tools just a thought

 

[Viperwolf1]

what is the plug for and if its possible why not drill a bigger hole tap that and be done no welding no fuss so you got to put a 1 inch plug in but it will be done with out welding all hand tools just a thought

Here's a better pic.

 

[distended]

What about pinning the block?
I've never tried it or seen it done but when I read about it then asked an old hot rodder he explained it to me and said it works.
like I said though, I have zero experience with it.

 

[airbur]

Tiny Crack/Pinhole in Block Repair?

Thanks for all the suggestions guys. Removing it is the last option. All I have left to do is the EFI harness, headers, and exhaust. I want to patch it.....either weld it, drill-etch-JB Weld, or whatever. I know that really nothing is 100% here other than a new block but that isn't going to happen now.

I'm talking with a race car builder now and sent him the pics. He should get back with me shortly on what he thinks.

 

[TwoDalesDad]

I would drill the tip of the crack...to stop it from chasing...Grind a V in the craklast then heat the block with a small propane torch. Mix up some high temp epoxy EBAY.. Then as it cools it will should seal it. I used this method on a blown chevy high dollar boat engine. After the fix we pressurized the engine it it held.....good luck...DID THIS BLOCK FREEZE?

 

[DirtDonk]

Uh, is that by any chance a second, larger crack just below and to the right in the picture just posted by Viper?
I hope it's just my eyes, a trick of the light, or the angle of the camera, but it sure looks like a mate to the first one to me.

Paul

 

[nvrstuk]

I'll get you the name of the kit/system that we used to use fixing cracks in engine boat blocks. Works great, holds for years....in marine application.

I've done a couple...

 

[airbur]

Tiny Crack/Pinhole in Block Repair?

http://www.locknstitch.com/

I don't know about these as the crack connects up with the plug hole.

 

[airbur]

Tiny Crack/Pinhole in Block Repair?

Uh, is that by any chance a second, larger crack just below and to the right in the picture just posted by Viper?
I hope it's just my eyes, a trick of the light, or the angle of the camera, but it sure looks like a mate to the first one to me.

Paul

I don't think so....I'll check it later today....

 

[Rox Crusher]

I don't think so....I'll check it later today....

View attachment 296185

to me it looks like that casting was suspect from the word go......

follow the visible crack across the hole to the 6 o'clock and then down and to the left it looks like some porosity exists in a line heading south / southwest

 

[airbur]

Tiny Crack/Pinhole in Block Repair?

New block! F that crack.

I agree.....but I'm to far along to let this stop me. I'll run it even with the dang leak if I have to for a while

 

[Wyflyer]

In my formative years I was a welder, repaired lots of cast. First rule is to identify if its malleable cast, see if a center punch chips it or dents it. Soft cast will repair better.

Now let me throw some out of the box thinking at you,,, Bill suggested weeping locktite but how to get it into the crack??

Wonder if you could drill stop hole on the crack with 1/16 bit, then hook a vacuum to the thermostat hose port and create a suction toward the inside of the block. irrigate with small bit of muratic acid to clean the crack, let the vacuum pull it through, then irrigate with water then brake clean or paint reducer, then suck some JB weld in the crack and JB weld the threaded plug in but don't tighten. No stress on block...