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block crack

J

JKeranen

New User
I have welded a cracked block, still have a tiny tiny crack i think. it is on the water jacket. is there any epoxy paint or application that will help with sealing up the crack
 
Try JB Weld. Its an epoxy. Getting the block completly clean in the repair area is crucial for this product to work well.
 
I have used a product called Marine Tek which I buy from a decent marine shop- it is used for repair of cracks in fiberglass and other items. It comes in black and grey, and is a two part mix like JB Weld but resists chemicals better. It can be sanded and painted over. I have used it on F-12 blocks, on both the inside, so it won't show on the outside and used it only on the outside. Haven't had a leak on any yet. The key is you have to get it REALLLLY clean before you put it on, and let it sit for awhile before using it- I think the directions say two weeks. I would suggest this stuff over JB Weld any day.
 
Many times when blocks are welded like that a leak will occur other places. That is why blocks are furnace welded by the major shops. Is the welding rod you used machineable? If so punch mark the crack and pin it. depending on the crack I would probably have pinned it to start with.
 
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