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John Deere Tractors Discussion Forum
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rod bolts

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kendak

06-28-2007 10:16:24




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Local dealer gets 10 bucks each for rod bolts for a 329 diesel power unit ...who else whould have these....thanks ...Kent




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K.B.-826

06-28-2007 19:04:07




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 Re: rod bolts in reply to kendak, 06-28-2007 10:16:24  
Ask them how much for a reman 359 short block. Once you hear the answer, those bolts will sound like a really good deal. Seriously, you do not want to cut any corners with Deere rod bolts. New head bolts would also be an exellent idea, but not required for that engine.



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Bob

06-28-2007 13:57:17




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 Re: rod bolts in reply to kendak, 06-28-2007 10:16:24  
$120.00 is CHEAP, compared to what will happen if a "will-fit" bolt happens to break "on the job"!



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G/MAN

06-28-2007 17:11:47




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 Re: rod bolts in reply to Bob, 06-28-2007 13:57:17  
I definitely agree. I've torqued hundreds of those bolts, and I still never quite get used to the feel when the bolt "yields" and starts to stretch, so I sure wouldn't trust anything but Deere OEM in that application. I'm not a fan of will-fit engine parts in general after having gone back into a few shadetree overhauls that were done using non-Deere parts and seeing how the will-fit parts compare to Deere OEM in a lot of areas, but I'd probably use will-fit liners and pistons before I'd use will-fit rod bolts.

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G/MAN

06-28-2007 13:47:18




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 Re: rod bolts in reply to kendak, 06-28-2007 10:16:24  
That's because they're special "torque-to-yield" bolts that are designed to be used once, and you pretty much want to make sure they stay in one piece. Will-fit parts outfits might have them - Reliance, etc. But they may not be a bunch cheaper.



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kendak

06-30-2007 05:59:50




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 Re: rod bolts in reply to G/MAN, 06-28-2007 13:47:18  
Thanks for the info don't need but [4]..they are going in bored & stoked "A" ....Kent



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G/MAN

06-30-2007 07:35:10




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 Re: rod bolts in reply to kendak, 06-30-2007 05:59:50  
If you're using cut and welded rods and the big ends were originally machined for the torque-turn bolts, that's still what you need to use, regardless of what they're going into, at least if you want the big ends to have the proper bearing crush and clearance and if you want the bearing bores to be round. Those torque-turn bolts apply considerably more clamping load to the cap than the straight-torque bolts used earlier, and those dimensions will change if the correct bolts and torque specs aren't used. Which is why upgrading to torque-turn bolts - which is pretty much standard practice when overhauling an older engine with the straight-torque bolts - requires that the rods be checked with the new bolts torqued to specs and the big-ends machined if necessary. Deere went to that style of fastener because it's a stronger design and failures are much less likely. You can do whatever you like, but I'm a little curious how many hundreds or thousands of dollars you've put in it so far before deciding that $40 for the bolts that hold it all together is just too much money. I'm not a big-inch two-banger expert, but I've got a buddy with a "GM" that's 700+ cubes, and I know there's nothing cheap about building strokers and that those highly modified engines are subjected to some pretty funky forces, vibrations, etc. Seems to me the rod bolts would be the last place to cut corners...

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kendak

06-30-2007 15:20:36




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 Re: rod bolts in reply to G/MAN, 06-30-2007 07:35:10  
Thanks ; I intented to replace with new bolts ..I thought maybe there was a different source ...Kent



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105EB

06-30-2007 12:04:22




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 Re: rod bolts in reply to G/MAN, 06-30-2007 07:35:10  
This guy thinks that parts catalogs are a waste of money..... so I'm not surprised he's crabbing about the cost of new rod bolts.



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kendak

06-30-2007 15:27:45




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 Re: rod bolts in reply to 105EB, 06-30-2007 12:04:22  
Sir ; nowhere in my post do I say parts books are useless...if that is the inpression you got you need to reread ..I have & use parts book every day..don't know how old you are but I'm 59 & have worked on [2] cyl. deere's since the early 60's...lets try to keep this civil OK...Kent



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P Browning

07-01-2007 08:15:23




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 Re: rod bolts in reply to kendak, 06-30-2007 15:27:45  
Here is your post of 6-26-2007 --

"parts books are very little help ..I've got a 37 unstyled "A" with a clutch off a 51 model...also has 53 model 60 main bearing housing & bearing...I know these parts # don't match up but my tractor runs just fine with them..it also has starter & flywheel off a 46 model & axles out of a 51 model...so much for parts books ...Kent"

I don't get a lot of difference between "useless" and "very little help". But then, on a good day, you can fool me! (PatB)

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kendak

07-02-2007 07:36:45




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 Re: rod bolts in reply to P Browning, 07-01-2007 08:15:23  
you win !! I give up ..you are the smartest & most informed person on this forum...I'm just a dunb redneck from MS. with 45 years of working on JD 2 cyl.... you'r the MAN...now can we please move on ...Kent



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