Posted by Owen Aaland on December 01, 2011 at 20:06:40 from (216.47.33.145):
In Reply to: 460 to 560 block posted by Keith-OR on December 01, 2011 at 16:40:32:
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I think the confusion comes from trying to compare two different numbering systems. IH parts suffix numbers with single digits, such as R3, are one piece parts. Parts with multiple digits in the suffix number are parts assemblies. As changes were made to the part the suffix number was increased. The newer number will work for the old number. Generally, in cases where the new part will work for the older one, but the older one may not work for the new one, the item was given a new part number.
The part number 312434R9X is an assembly number. That is the number you will find in the parts catalogs and it will include items such as expansion plugs, oil galley plugs, studs, and possibly bearings and seals. The number 278262RX is the one cast into the block and is the part number for the bare casting only. Since replacement blocks were never sold as bare castings you will not find that number in the parts system.
My 460D has had the block replaced with one from a 560D. The number cast into the block is 278262R4. I also have a spare block from a 706D that has casting number 278262R6
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