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Fordson Tractors Discussion Forum

Re: 4000 Major??

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Author  [Modern View]

02-24-2011 09:11:29

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Majors did not have porosity problems any more than all other wet sleeve designs. Our local J-D dealer, IH dealer and Nuffield dealer all had to replace cylinder liners due to cavitation.

After a number of years the seal groove could wear at the bottom of the liner but most Ford dealers would repair it with ease.

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Mike Farmer

02-25-2011 11:34:47

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 Re: 4000 Major?? in reply to Majorman, 02-24-2011 09:11:29  
Hi I agree with you that this is not only a Forson problem. Providing its only the groove or porosity around the groove then you are absolutely right. I've successfully repaired them by pumping in 'bathroom silicon sealant' into the back of the groove before replacing the seals and resleeving. However a lot of them now have been 'done' more than once and I am reliably informed that quite often as a result of the long term porosity, pieces of the original casting comes away with the liners. That would be more than just difficult to repair. As ever I am interested in anyones opinion on this, cos I'm still learning. MTF

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02-25-2011 15:10:46

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 Re: 4000 Major?? in reply to Mike Farmer, 02-25-2011 11:34:47  
We repaired them by fitting an "o" ring in the groove, sliding in the seal end of a sleeve, cut off to just above the machined surface, then building the groove up with "Molecular Metal". When this hardened, remove the cut down sleeve and "O" ring and you have a perfect seal groove.

This repair lasts for many years, I have been repairing Major blocks like this since the 1960's.

The later Super Majors had a second "O" ring at the top of the liner and the problems were reduced, but after 50 plus years you must expect a few problems.

This problem is not really the same as the later porosity problem which is due, in part, to the short stroke, "knocky" engine in the '000nd series.

There were some casting quality problems too. We had tractors with "hard spots" in the bores when new, which honing would not remove. These appeared after around 300 hours. We were fitting sleeves into new tractors to cure it.

There is a fine article on this problem from Cat. who also suffered from it in some models. It is on the internet but I do not have a link to it. It is well worth the read.

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Mike Farmer

02-27-2011 04:33:31

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 Re: 4000 Major?? in reply to Majorman, 02-25-2011 15:10:46  
Hi thanks for that, Its certainly a method I never considered, Its possible to do a weld repair but the work incurred in getting the casting shape and the seal groove correct is very time consuming and leaves a lot to be desired. However I now have one more arrow. MTF

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