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Cracked block !!!

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Matt L

12-22-2005 17:57:16

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I finished striping the shortblock for my to30. ITS REALLY CRACKED (lol) anymore crackage the block would be in 2 pieces :D The sleeves came out pretty easy for the most part after i pulled the o-rings off. The studs where another story A big pain in the butt - Hadda heat every stud almost and use wax on em.

There was so much stop leak that it was 2.5" up on the sleeves !!!!

Far as actual cracks, theres cracks on the top and the bottom of the sleeves. Plus as a added bonus/ door prize. I won the extra bonus crack thats starting inthe center main webbing.
Im just so excited..... .... !!

Now for the fun part.

Building a oven to furnace braze it. Any thoughts or idea's? I was thinking of using a barrel, but it wont work for future use with v8 blocks. Im thinking of buildinga box with a hinged lid and lining it with brick and figure out something for lid to keep the heat in.

Any ideas?

Was gonna surface my fixed head, but I ran outta time - I took too long hot tanking parts and sandblasting sheetmetal to be powdercoated

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ZANE

12-29-2005 06:37:27

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Re: Cracked block !!! in reply to Matt L, 12-22-2005 17:57:16

I bought a TO 20 Ferguson back in about 1963 when I was working at a Ford dealership. I had removed the sleeves to rebuild it alreay bought the new sleeves etc to do the job with when I discovered that the block was cracked between each cylinder at the web in the bottom of the block. I showed it to the owner and he decided not to try to fix it and bought another tractor there at the dealership. I boutht the TO 20 from him for $500 along with the parts that he had already paid for.
I steam cleaned the insides of the block really good and then took soft lead and drove it into the cracks with a punch and a chisel that I had flattened the point off. I think trimmed the lead to the edge of the bore where the sleeve fits and after greasing the new sleeves good I drove them down flush with the block deck and put everything back together. I filled it with antifreeze coolant and added a container of Bar's stop leak for good measure. That same antifreeze is still in the engine and has never shown any sign of leakage into the crankcase. That was about 43 years ago and I still use the tractor when it is needed. I guess I fixed it! :O)

Zane

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Matt L

12-23-2005 18:09:37

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Re: Cracked block in reply to Matt L, 12-22-2005 17:57:16

I really dont see why I will have problems with this fix. The guy I work with at nite knows his welding stuff, if not he can ask one of his many customers on what rod/ flux to use to fix it.

Far as machining - I can do that on my days off. Plus my old boss fixed his to-30 years ago and didnt even heat it up like we did my cylinder head. To this day his old tractor still runs around I hear with no issues( even tho it has oddball pistons and sleeves for something else)

If worse comes to worse i can grind the brass off then have and have it professionally done or just buy another block if need be.

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Dennis P in Ohio

12-23-2005 05:14:16

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Re: Cracked block !!! in reply to Matt L, 12-22-2005 17:57:16

Let me add to Jerry"s comments: I would find a good heat treat shop and let them do it. They know metallurgical processing, which involves careful control of temps., such as rate of rise, holding time and cool down procedures. This is an art and a science and would be well worth the cost.
Just my two cents.
Let us know how you do.

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Jerry/MT

12-22-2005 19:12:09

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Re: Cracked block !!! in reply to Matt L, 12-22-2005 17:57:16

Furnace brazing is a lot more intricate than you seem to realize. You have to have the right powdered braze and be able to control the oven temperature carefully. Just heating up the block and hitting it with a brazing torch and rod is not furnace brazing. When furnace brazing is properly done, you have to remachine the block because the oven heating cause the block to be stress relieved and thus somewhat distorted. If I were in your position, I'd take the block to an outfit that specializes in this type of repair. Just my two cents.

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