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Fordson Tractors Discussion Forum

Report on Starts the dies ( a year ago) +Major blo

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Tom in Cherrylo

01-08-2006 23:45:27




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A year or so ago, I asked what might cause my Dexta to die consistantly after about 15 minutes. Air in fuel,was the favorite answer. The poor old girl had been assembled with one of the clutch splines not aligned so the crank was being pushed forward. The thrust bearings were ground down then the crank began to grind on the block and bearing caps. A crank and caps from a junker and lots of timkering with thrust semi circles oh and some grinding of the rear edges of the main bearing seats and she right as rain. New rings and seals. I now have lots of parts from the spare I bought.
ie. a rebuildable head, transmission, injector pump (works), flyeheel and clutch assembly front axle, hoods, intake manifolds with heaters, filter casings etc. Also a complete working engine - nosmoke. Oy veh! I'm in north GA if interested. So much fun I bought a Major that I find has cracks between liners. Question: Anyone succeeded in repairing Major blocks cracked likely by freezing? The problem Isn't loss of compression but oil mixing with water. It is a wet sleeve (right?) and badly needs rebuilding anyway. Thanks for any comments, Tom

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Majorman

01-12-2006 10:58:07




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 Re: Report on Starts the dies ( a year ago) +Major in reply to Tom in Cherrylog, 01-08-2006 23:45:27  
Tom,
Yes I understand, I have to work that way too at times to keep some of my gear running. The workshop manual stresses that under no circumstances should the caps be changed and I have experienced what happens when this has been done on these engines.

That's why I try to give you all the information.

Never had any experience of the power steering kits. I don't think I have ever seen PAS on a Dexta. Usually big front tyres on a loader sorts the problem.

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Majorman

01-09-2006 08:35:57




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 Re: Report on Starts the dies ( a year ago) +Major in reply to Tom in Cherrylog, 01-08-2006 23:45:27  
Tom,
Don't want to pour cold water on your Dexta repair but it is possible that you may have built a problem into her.

It is not possible to replace ANY of the main bearing caps with others from a different block successfully. When a block is made all the mains are line bored so the caps fit exactly and are not interchangeable with any other block. If you want to put new caps on, the block has to be line bored again and over-sized shells used. Otherwise it has to be a new block.

Hope you are lucky though.

Cracking between the bores on a Major is a very difficult job too. I would think it is just about impossible to repair without spending lots of money. A crack in the bottom web could possibly be welded but the top would have to be welded and then refaced for the head gasket. This would mean that you would change the protrusion of the liners and may have to machine the lips where the liners rest. A replacement engine might be a better bet. IMHO.

Sorry.

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Tom in Cherrylog

01-11-2006 12:27:01




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 Re: Report on Starts the dies ( a year ago) +Major in reply to Majorman, 01-09-2006 08:35:57  
HMmmmm. Majorman, Appreciate you comments and doubts.I hope I"m lucky too. The basis of my hope is that after installing the new (used from another engine) Cap (just the rear one) and reinstaaling them after releving, ie. slight grinding away the closing caused by the grank grinding on the back edge of two of the journals, block and caps, the crank turned readily with new bearings installed and caps torqued down. Also the engine runs well without noticeable bottom end noise. The crank was turned to accomodate .010" oversizes rod bearings and .020" mains. Line boring was an option these folks waged their heads at. Maybe as needed. It diddn"t seem to be. I am much more curious about whether the shimed thrust bearing in the block will spin or bind and eat itself up. The new cap with undamaged gland for its thrust bearing tab should resist spinning of the lower half circle but the lower one is shimmed in a wallowed gland. In any case, please understand that this an ad hoc, shade tree opperation, the essence of ametuer. I am testing myself only. Professional conventions are, as they must, be conservative. This is sport.

Your comment on the Major"s block seem right on. I won"t bother exploring repair. Any opinion about Turkish power steering Kits?

Cheers, Tom

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