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John Deere Tractors Discussion Board

Re: 2640 rebuild

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Posted by Jethro Lilley on February 20, 2013 at 13:04:43 from (

In Reply to: 2640 rebuild posted by Albert F on February 19, 2013 at 17:14:48:

If Tim S is right and the engine is dusted then a rebuild is called for. If not, then it sounds like oil is coming by the rings for some reason. Either the oil ring is not working or the cylinder is glazed. You state that your guess is 3000 hours since a rebuild 15 yrs ago, and your dad ran it 3 yrs and reired. Then the tractor sat with minimal use for 12 yrs. One has to work a tractor for 15 years at 200 hrs per year to accumulate 3000 hrs. 200 hrs is a lot of work for a tractor that is probably not the primary tractor. Probably has a lot fewer hours on that rebuild. It took me 20 yrs to get 5500 hrs on my 2510 before I rebuilt it. Let's assume the cylinders have glazed for a minute... If the rebuild did not include proper scoring of the cylinder walls prior to installing pistons, head etc. and/or unburnt fuel/oil has glazed the cylinder walls to where the rings will not seat, then there is an easy trick to try that was done on my dad's D6 Caterpillar when it was new and suffering excessive oil consumption. A factory man came to the field dressed in a business suit and told dad to take the air filter off and start the engine. He then sprinkled some Bon-Ami (Ajax, Comet) into the air intake side of the engine, like one would salt a hamburger using his thumb and forefinger. He did this about three times over the span of a few seconds. He then allowed the engine to run a minute or so and told us to "Shut'er down and change the oil." The Cat immediately stopped losing oil. The Bon Ami broke the glaze on the cylinder walls allowing the rings to seat and the oil change removed all traces of the abrasive before harm came to the bearings. If Tim's test proves no RPM loss then the engine hasn't been "dusted" so try this... it's cheaper than rings and sleeves and if a rebuild was needed after all, what have you lost? 7 qts and a filter? Cheaper than a couple of grand for a rebuild.


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