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Harry Ferguson Tractors Discussion Forum
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Z129 block

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djwalt

04-06-2007 05:56:05




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Whats the goin rate for a Z129 block ? Supposedly mine cannot be welded ? the shop said its too brittle and keeps cracking . Is this true since you all know your engines better than i do.. Ive got over 700 bucks in parts waiting on a block..:(




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Jerry/MT

04-06-2007 08:34:04




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 Re: Z129 block in reply to djwalt, 04-06-2007 05:56:05  
Look for a reconditioned block. They were generally cracked but have been furnace brazed and thus are stress relieved and align bored. You're looking at about $500 which is competitive with an uncracked used block. In my opinion, they are as good or better(due to the stress relief) than the origninal block. I have one in my '54 TO-30 that I installed in 2001 and it's a working machine on my ranch not a show tractor. it runs like a top and I have had no problems with it. Find a machine shop that either does the repair or can tell you where to send the block for repair. If you are in a hurry, they may have an exchange block for you.
Welding repairs on thin cast iron are difficult to do well.

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djwalt

04-06-2007 07:28:39




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 Re: Z129 block in reply to djwalt, 04-06-2007 05:56:05  
I live in WNY and the the shop i took it too said he would sell me a reconditioned block for 500. It sounds like the guy he sent it too dont know what hes doing...i figured a place that deals with old trators knows whats goin on.. im going to pick up the block today hopefully and take it to another shop who can weld cast..and see what he says.



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Jim in OH

04-06-2007 07:56:18




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 Re: Z129 block in reply to djwalt, 04-06-2007 07:28:39  
I'd be careful about just someone who "welds cast"... I'd want someone with experience on the Z129 block... (I'll get some flack here on this forum, but..) this block is marginal and fragile in its best condition... any kind of unusual stress or strain will crack it.... Jim



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Jim in OH

04-06-2007 07:21:14




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 Re: Z129 block in reply to djwalt, 04-06-2007 05:56:05  
djwalt... Z129 blocks are becoming very scarce! I was able to find a cracked one to have repaired.. I have seen Z129 and Z120 blocks going for more than $500 on ebay with no guarentee that you are getting anything better than what you have... Almost all Z129 blocks are repairable IF the shop knows what they are doing... just welding on it is almost certainly going to make it worse. The required process is called "furnace brazing"... first is to grind out the cracks... then oven heat it to about 400 F... then BRAZE it (use a braze suitable for cast iron, lots of flux and have lots of experience)... then let it oven "soak" at a temperature just below the braze temperature for some time, usually overnight, to relieve the stresses.... then let it air cool SLOWLY (do not fan cool or quench)... then you will need to align/line bore the mains and the camshaft bearing supports, have cam inserts installed, redeck it, and the refinish the top and bottom sleeve bores as necessary... This is an expensive process.... about $500 plus shipping if you can't find one close, but you know what you have... and done correctly, you will have a better than new product because the internal stresses have been relieved... Where do you live? Maybe I (or others) can supply a name or two where this cna be done... I know Jerry/MT has one also... email is open.. Jim

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