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Re: John Deere 400 series backhoe and loader
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Posted by jdemaris on November 18, 2004 at 05:35:52 from (209.23.30.243):
In Reply to: John Deere 400 series backhoe and loader posted by Bob Santilla on November 17, 2004 at 06:35:47:
It's a very easy engine to rebuild, in-frame - except for the balancing shafts and bushings. The 400 is basically an Ag. 2020 tractor painted yellow. The engine is usually good for one in-frame motor job (sleeves, pistons, main and rod bearings, and valve job) without doing the balancing shafts. Once the shafts and bushings are worn, it won't hold oil pressure once hot. Make sure the valves are done correctly. We had a lot engines that became hard-starters after the valves were ground too deep. Valve-head depth is critical on these engines. Originally, the cylinder heads do not have hardened valve seats. In stead of grinding the old seats, you're much better off having new hardened seat inserts installed. This makes it much more durable, and also allows adjustment on the installed valve head depth.
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