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Block repair with waterglass?

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Tom in Texas

09-22-2003 17:49:28

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I have a 1947 B Farmall with a cracked block. the previous owner had repaired it with something like JB weld but it had eventually failed. The local welders are less than enthisiastic about welding the block on the tractor and I want to use it for a year or two before it goes in for overhaul. One welder suggested using a guart of waterglass. I had heard about this years ago from some old timers but have never used it. The label says it is not compatable with antifreeze solututions. Does any one have any suggestions or tips that will help me? Thanks in adavance for your help.

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Moby

09-25-2003 18:43:37

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

I would recommend having it welded. I have welded on 3 engine blocks and had success on 2 of them. All of them were crack in the water jacket on the outside of the block. It seems to me that the older stuff takes the weld better without busting out. The one that failed was on a newer truck. There is a really good stick rod made by Palco (can't remeber the number) that works really well. It's got a lot of nickel in it. I used a 3/32 at about 65 amps dc with the block preheated to about 400f. I drilled the crack at each end with an 1/8 bit and ground and wire wheeled it to get it clean. It has to be really clean, then sprayed it down with a contact cleaner before I heated it. I heated the first block over a woood stove and the last one I did at work in a big bearing heater oven. Get a good strike and run the rod fast and keep in on the heat then cood it really slow.

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Ray

09-23-2003 14:19:23

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

I wouldn't use waterglass,I used it a couple
years ago,it turns to slush in the radiator and
plugs things up.I had to have my radiator boiled
out,the hoses and water pump were full of that
junk.

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Tom

09-23-2003 06:10:27

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

Would not use water-glass product. You will stop up many small passages inside the block. Engine will later overheat in these areas, thus leading to more cracks, and more problems. May ruin waterpump also. You will never know when the patch will break loose and leave you without use of your tractor. Have a good welder fix it correctly. By the way, I used these products on a Chevy engine 30+ years ago. Overheated from that day forward. Had to trade it off.

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Dieselrider

09-23-2003 04:24:31

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

A good welder can fix that crack. Alot of guys shy away from them in cast iron because cas tends to crack if the carbon draws toward the heat. You can't let it get real hot. I have never welded a block back together but, I have used 7018 rod on a cast moldboard once as a "temporary fix" until I could get a new one. The old one is still doing the job. I know another old timer that has welded alot of cast and has a bunch of know how. I've seen where he's fixed large holes in blocks and they never leak or crack. There is nothing as permanent as melting that metal back together for a fix. You could also consider brazing with brass to seal it up. That might work. Easier than welding.

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Robert Walker

09-23-2003 04:41:13

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Re: Re: Block repair with waterglass? in reply to Dieselrider, 09-23-2003 04:24:31

I repaired a block in 1984 using a Cast welding rod and then put a top coat of J B Weld over it to make sure I had no leaks, rod does not produce a pretty smooth weld but it works. It is still running today with no additional problems or repairs. The previous owner had put a rod thru the side of the block.

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Vern MI

09-23-2003 04:12:47

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

Anyone ever try the special cast iron rod from Muggyweld?

Cast iron welding rod

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gene b

09-22-2003 20:15:05

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

Get some rubber cement that they use when putting in a new windshield. Grind the area up to get clean metal about 1in wide and the length of the crack. Then use the rubber cement and follow instructions. Mine has worket for two years on the belly mower and we mow around 5 acres. Doesent show any signs of leaking. Crack was same as yours and water ran out faster than you could add it. Sure beats welding.

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Larry806

09-22-2003 18:21:14

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Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 17:49:28

A quart???? How big of hole does it have? The old timers around here used it for years. I know of a JD D that the guy used a hacksaw to cut off the excess after it set up. Best way is unhook the radiator, hoses rinse the block out, plug the bottom hose Than fill with slightly warm water & water glass Seal the top hose. Water glass set's up when it get's air The only air you want it to get is where the repair is Larry

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Tom in Texas

09-22-2003 18:29:38

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Re: Re: Block repair with waterglass? in reply to Larry806, 09-22-2003 18:21:14

How much waterglass should I put in? The crack is horizontal on the left side about four inches below the head and is about nine inches long.

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I Like Case

09-22-2003 23:02:51

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Re: Re: Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 18:29:38

I have used waterglass to seal cracked-uh,broken-blocks in the past. They were temporary repairs and I don't recall ever trying it with antifreeze. WARNING--disconnect the hoses going to the radiator or you will be replacing it. I'm not sure that the water pump will like it either.

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Larry806

09-22-2003 20:01:57

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Re: Re: Re: Block repair with waterglass? in reply to Tom in Texas, 09-22-2003 18:29:38

I think a pint would be more than enough

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Brad York

09-22-2003 22:51:15

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Re: Re: Re: Re: Block repair with waterglass? in reply to Larry806, 09-22-2003 20:01:57

If you want another repair option, check out locknstitch.com

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