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WC BLOCK CRACKS

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Bill Peckhart

09-18-2002 16:03:04




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I have a block from a WC tractor. It had been parked for some time. When I took it apart, I could see why. A piston rod bent like a pretzel. Anyway, when I was driving out the pistons, the sleeves came out with them. Looking at the block, there is a crack in each of the webs between the inner pistons. The front and back of the outside of the block is okay. My question is since there are cracks in the webs, is the block good or bad??

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BushogPapa

09-20-2002 06:27:43




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 Re: WC BLOCK CRACKS in reply to Bill Peckhart, 09-18-2002 16:03:04  
WC & WD blocks crak at the lower 1-2 & 3-4 webs...I think because of the very narrow web, and stalling the engine--Hot...and not turning it over, to allow the heat to get away from the pistons that are stopped at the bottom of the cylinders.... Even if I run out of gas, I turn it over a few times, to even out the heat in the cylinders. Pinning the block is advisable.....Even if you don't, carefully pour a Pint of Aircraft gasket sealer into the CLEAN block, allowing it to coat all around every sleeve bottom, and web. That will prevent water and antifreeze from getting into the oil pan.... My block was Resistance Welded, and Pinned...never gave any problem before it was re-built, except a hint of moisture on the dip-stick...

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Scott

09-19-2002 18:19:57




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 Re: WC BLOCK CRACKS in reply to Bill Peckhart, 09-18-2002 16:03:04  
Hi Bill, I have heard of these cracks and they sound like they are very common in these old casted blocks. I did a search on the YTD site for "Cracks" and found several postings dealing with cracked blocks. It seems almost all the cracks were fixed at the machine shop by pinning the cracked block and then welding the cracks shut. I myself have a WC but have not taken the engine apart to physically see these cracks in the webbing, but I am sure my block has them too. The other thing I have also read that the cylinder sleeves cover up those cracks in the cylinder walls of the block and then a good head gasket seals up the cracks on the block surface. I would take the block to my favorite machine shop and have them give you a suggestion of what they would do to fix those cracks. Hope this helps and good luck on getting your engine going again. It will be worth it in the long run.

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Steve in N.J.

09-18-2002 16:56:24




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 Re: WC BLOCK CRACKS in reply to Bill Peckhart, 09-18-2002 16:03:04  
Bill,
If I remember correctly from past posts on those cracks at this site, the hairline cracks are normal, but if they are wide, that's when it's a problem. I'm sure you'll get some feedback from the Pro's on this site. These guys know their stuff about Orange! Dick Lemmon posted some pix on how to fix the bad cracks by pulling the block together with long bolt between the cylinders a while back. The deck of the block on my B has two hairline cracks between the cylinder webs. I took a chance with it from the info that I read here, and re-assembled her with all the new stuff. So far she purrs like a kitten.. Good Luck with it! Steve B.

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