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John Deere Tractors Discussion Forum
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'D' crankshaft - throws badly out of round.

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Jon

08-19-2003 12:51:17




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What would you do if the throws on your JD "D" crankshaft were badly out of round, by about 10 thou? {a} grind the throws and re-babbet the original rod bushings or {b} find NOS bushings and then build up the crank to standard. Very knowledgeable people whose opinions I highly respect are giving me very different answers and reasons for their advice.
Also, can anyone direct me to a source for NOS rod bushings AD671R - already checked the JD search system.


Thanks in advance for the advice,
Jon

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Clooney

08-19-2003 15:51:17




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 Re: 'D' crankshaft - throws badly out of round. in reply to Jon, 08-19-2003 12:51:17  
Jon, that's a tough call. ~The thing I will agree on is it probably should be addressed... .010" + the nominal rod clearance will give you .013"-.015"+ rod to crank clearance at the rod bearing & that is way too much.
~What I would do would depend on the options available at the time I was working on it. ~The option list would start with how bad the rod bearings are. If they are still in decent shape I would consider just spray welding the crank journals & turning it to proper clearance to the existing rod bearings. ~If it needs new rod bearings I would look at maybe just truing the crank journals to be round then using some early rods with good babbit or re-babbiting the early rods to match the trued crank. ~Might even look for a good used crankshaft, you never know, it could be cheaper than repairing yours. ~You might try calling Kevin at F.P.R. (610-845-3668) to see if he has access to undersized rod bearings [he has some unique D parts].
~If you are attempting to do this through a local machine shop you really should ask their advice as they know their equipment & abilities. ~It's hard to give a definitive answer as the job & direction could change as the price of one option could be much lower than another option depending luck, the correct call to a person that has part you need at a good price, a shop that can do the work, or another parts tractor could just POP into your life.
~When you decide on a direction let us know what you decide?

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Henry J

08-19-2003 13:56:29




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 Re: 'D' crankshaft - throws badly out of round. in reply to Jon, 08-19-2003 12:51:17  
Jon

Im my opinion, the key is if you have had the tractor running and what it sounded like and if it had adequate oil pressure. If it did not knock and had oil press and you are not gonna work it like a dog, then why spend the mega bucks to change something that will never be seen or heard. However a person needs to do what makes him feel good. Have fun!



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