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John Deere Tractors Discussion Forum
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John Deere 400 series backhoe and loader

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Bob Santilla

11-17-2004 06:35:47




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Hello,

I recently purchased a John Deere 400 series backhoe/loader tractor. The engine seems a little tired, difficult to start. I am wondering if it is less expensive to find a decent replacement engine as opposed to rebuilding the original. Also, what different engines will fit my tractor. It is a four cylinder diesel.

Thanks,

Bob




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jdemaris

11-18-2004 05:35:52




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 Re: John Deere 400 series backhoe and loader in reply to Bob Santilla, 11-17-2004 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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JDknut

11-17-2004 10:12:38




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 Re: John Deere 400 series backhoe and loader in reply to Bob Santilla, 11-17-2004 06:35:47  
Probably has a 4219, 4239 or 4276, depending on vintage. Those are decent wet sleeve engines worth the rebuild especially if only an inframe is needed. Shop inframe on a 4239 for me this year was $3800. Pistons, rings, liners, seals, bearings, valve job, etc. But if the hard starting is the only thing, maybe it is injectors, pump, timing, poor electrical cable connections, etc. might pay to check those first, then check compression to see if it is up to spec. Just my $0.02. good luck

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