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Restoration & Repair Tips Board

Cracked Engine Block

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Al Boy

09-05-2004 17:27:31




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Had the external crack on engine block welded,but would like to cover the weld as much as possible for a good appearence. Is there any product on the market i can use that will withstand heat to smooth out the bead of weld and paint over?Thanks in advance for any help




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Bob

09-05-2004 22:13:59




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 Re: Cracked Engine Block in reply to Al Boy, 09-05-2004 17:27:31  
Grind the weld down near to flush with the block. Clean an area on each side of the weld thoroughly (sandblast, perhaps?) and mix up some JB Weld (or equivalent) and smear it over the weld, and "feather" it out on either side of the weld, over the bare, clean metal.

Somewhere I can't recall at the moment, on another board, someone has posted that they wait until the JB gets partially set up, and then takes a sheet of fairly coarse sandpaper and presses it against the still soft JB to imprint a texture that is similar to the original sand-cast texture if the cast iron, making the repair nearly invisible.

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CRUSADER

09-05-2004 19:50:17




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 Re: Cracked Engine Block in reply to Al Boy, 09-05-2004 17:27:31  
Al,
MANY years ago (prior to joining the military) I worked in garages in Central Texas. From the boss of one of the garages I learned how to repair/patch a lot of equipment for resale. Some where in the area, there are a few tractors that I patched the blocks on...most likely still running and working for their owners. One trick to welding up a hole in a block where something has exited the side of it is: Grind a "V" or an angle into the area of the hole were your going to weld. Then do the same for the piece that you are going to weld back into the hole. Set up your welder (it's been a long time so I don't remember the settings) and buy some Ni-Rod to use. Prior to welding up the area where the patch is going to be done, make sure that it is clean and free of any and all lubricant/oil products as much as possible. Tack and put a small bead in the areas around the patch to hold it in place. Then let it cool. After it's cooled, then start welding it up at about an inch at a time and allowing it time to cool down. Once you have welded up the crack or patch back into it. Chip and grind down the welds to insure that they are good. If required fill in where needed and grind it down again as smooth as you can to the block. One of the things in your favor is that the Cast Iron block is a rough finish and doesn't require a "smooth finish." Get some two part epoxy mixed up and smooth it over the area that has been patched to allow it blend in with the natural roughness of the block. After you have obtained a satisfied coat over it, then take some sand and sprinkle it over the epoxy. Not a lot, just enough to blend in with the natural texture of the engine block. Now you let it set up and dry real good. Trust me, if it is a good job, once it' been primed and painted you will have a hard time telling exactly where the patch is. The last tractor engine that I did this to was over 20 years ago. I know for a fact that one of the tractors that I welded the block up on is still going strong. The owners still haven't (to my knowledge anyway) figured out that the block has been patched, and I wasn't about to tell him. Not only will the epoxy with the sand mixed in with it give the engine the undamaged appearance, it will also help seal up the area and keep the fluids from leaking out.

Good luck with your project. I really enjoyed the challenge of this repair. Although I never did enjoy the part where the piece of equipment was sold from the lot or through the auction ring and the buyer was never informed of the condition.

later days mate,
Jim

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