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Tips on repairing a cracked block ?


 
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dave404
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Joined: 20 Mar 2012
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PostPosted: Fri Jul 19, 2013 6:26 am    Post subject: Tips on repairing a cracked block ? Reply to specific post Reply with quote

one of our 8N's has had a crack by the drain plug in front of the starter for years. We jb welded it and it held for years but has cracked more now.
which will be best braize it or weld. if brazing will be better ,any certain type rods or ??
 
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Bob
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PostPosted: Fri Jul 19, 2013 6:36 am    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

Clean it DARNED good and epoxy it again, or PIN it.
Pin, pin, pin that crack

 
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HCooke
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PostPosted: Fri Jul 19, 2013 7:38 am    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

I had a block stitched (pinned). I was very happy with the results.
 
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DollarBill
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Location: Keystone Heights, Florida

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PostPosted: Fri Jul 19, 2013 7:59 am    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

In addition to stitching, brazing, and epoxy, liquid glass is another alternative that offers a permanent repair that is not visible from the outside. Post back if interested and I'll give you the "How To".
 
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Dean
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PostPosted: Fri Jul 19, 2013 8:20 am    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

Brazing or welding not recommended.

Cold stitching will work if done properly.

Use K&W block seal after stitching. Follow the directions PRECISELY or don"t waste your time.

Dean
 
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Den N Ms
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PostPosted: Fri Jul 19, 2013 12:55 pm    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

Dave404,I have successfully brazed N blocks in the past but it's a lot of work and takes quite a bit of time doing it.I told every one here years ago about Lock & Stitch years ago and that is the only way to repair a cracked block. Do not try electric welding one at all ,you will just wind up with scrap iron.
an old Lock and Stitch post

 
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Ultradog MN
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PostPosted: Fri Jul 19, 2013 2:38 pm    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

I would just clean it up real good and use an epoxy to reseal it. Wire brush on an angle grinder then lacquor thinner.
The trouble with any kind of welding, brazing or even pinning is that it will always show up and devalue the whole tractor.
Just epoxy it again untill it comes time to rebuild it and then get a good block.
The money you spend on a block will be a lot less $ than any repair you can do to it (other than epoxy) and you wont take a hit if/when it comes time to sell the tractor.
 
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souNdguy
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PostPosted: Fri Jul 19, 2013 4:10 pm    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

how big is the crack? and does it start at the drain plug hole?
 
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FLAcharlie
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PostPosted: Sat Jul 20, 2013 12:27 pm    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

just wanted to say I had a leak between the drain plug and the starter after pulling the starter (wasnt easy). cleaned it up real good including brake cleaner and JB Welded it and it has held for maybe 8 years.
 
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dave404
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PostPosted: Sat Jul 20, 2013 5:27 pm    Post subject: Re: Tips on repairing a cracked block ? Reply to specific post Reply with quote

well, we got it apart and rotated the motor on its side where it would lay flat.
Cleaned it up really good and jb welded it again.
hoping for the best 2nd time around.
 
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