cracked block

[keitherb]

I had a large 8 inch long crack along the top right side of my block on the 1929 John Deere d. Had it welded by an experienced welder buy I don't think he heated the block enough so now I am getting hairline cracks in the area of the weld. I can do additives to the radiator to plug the cracks but was wondering if any body has used any of the exterior applied products that might help seal as well as help keep the cast from moving quite so much when heating during the run time so as to avoid more cracking. Dont really know what to do. Any ideas.

 

[Phill Tibbetts]

I've seen a lot of cast iron welding jobs over my 81 years and also a lot of brazing jobs. Brazing always seems to be a better way to go. For one thing you don't have the sudden bursts of heat and cold. Just my opinion and it is free for whatever it is worth.

 

[keitherb]

Well too late now but thanks..

 

[tomturkey]

Were you there to see him pre-heat or not pre-heat the block? How much pre-heat should have been done???do you know???Whatever the outcome nows not the time to second guess your fix. Move on from here, you hired an "experienced welder" he did the job best he could. A lot of should ofs and could ofs and I'll never do that again when we repair old iron. move on gobble

 

[used red MN]

wondering if any body has used any of the exterior applied products that might help seal as well as help keep the cast from moving quite so much when heating

A layer of JB weld over it will likely seal it. It will not keep the metal from moving around during heat/cooling cycles. I doubt there is any material that will do that beyond the weld being removed and rewelding it.

 

[560Dennis]

Consider K seal fleet

The Coolant, Head Gasket & Radiator Leak Sealant | K-Seal

K-Seal® provides a permanent repair for leaks & cracks in your engine's head gasket, block, radiator, heater matrix & water pump. Just shake, pour & go!

www.kseal.com

 

[keitherb]

Yea, thanks, I am familiar with that product. What my concern is as the tractor is heated and cooled during operation will the cracks continue to elongate and if so when does it end. There is one or two that are applied on the outside with a fiberglass or steel mesh embeded that claim to keep the metal from expanding and stop additional cracking. Was hoping to find someone that used them and had success at arresting the travel.

thanks.......

 

[Fixingfarmer]

Yea, thanks, I am familiar with that product. What my concern is as the tractor is heated and cooled during operation will the cracks continue to elongate and if so when does it end. There is one or two that are applied on the outside with a fiberglass or steel mesh embeded that claim to keep the metal from expanding and stop additional cracking. Was hoping to find someone that used them and had success at arresting the travel.

thanks.......

I know on the ford forum there’s some lock and stitch products. I’ve never used them the only holes in blocks I’ve done have been jb weld and fill in the hole like suggested above it works

One particularly large hole I saw filled with epoxy the individual used a paint roller with a textured roller when he had it placed and it looked more like cast.

Lock and stitch you are gonna see it and a 29 d is an order of magnitude more metal than an 8n block

And I’m sure you are aware the only true fix to this is finding your casting number and being on the lookout for one everything else is a might not work solution

 

[Copperhead don't play]

I have seen brazed repairs and JB Weld repairs, and both have been successful. Don't worry about it until it leaks.
Paint it and use it.