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John Deere Tractors Discussion Forum
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Anyone seen how new rods are built

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Jerryh

10-15-2004 19:56:10




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I saw a set out of a late model JD at Worthington Salvage that the rods are machined solid then the rod cap appears to be broken off, there is no smooth part where they bolt together.It is just rough cast break and when you put the cap on it all lines up. Every one was different break pattern. What were they thinkin.Has anyone saw any off these. Some even have a jagged edge where they bolt together.It took him awhile to figure out which went where.

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G-MAN

10-20-2004 07:46:33




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 Re: Anyone seen how new rods are built in reply to Jerryh, 10-15-2004 19:56:10  
I believe those rods were first widely used in the Cadillac Northstar engines. Benefits are lower production costs, precise cap alignment without the need for grooves or dowels, and a stronger rod due to the grain of the metal being preserved and not machined off flat. I suppose the argument about not being able to be serviced could be made, but I've also seen traditional rods with 8000 hours on them that were still within spec and didn't need resized. There's no reason the new-style rods won't match that, and if they were out of spec, they could probably be replaced relatively economically.

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jd4960

10-16-2004 13:02:37




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 Re: Anyone seen how new rods are built in reply to Jerryh, 10-15-2004 19:56:10  
ford has been using those in the 4.6 and triton engines since the came out



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Chrisfromsolitude

10-16-2004 10:42:44




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 Re: Anyone seen how new rods are built in reply to Jerryh, 10-15-2004 19:56:10  

They are supposed to be a stronger connection than the old machined surface also.



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ET

10-16-2004 05:16:03




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 Re: Anyone seen how new rods are built in reply to Jerryh, 10-15-2004 19:56:10  
They are called fractured rods. The new 6 liter ford power stroke engines use it to. Rod caps cannot be switched and the alignment is more exact.



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Lee B

10-15-2004 23:41:19




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 Re: Anyone seen how new rods are built in reply to Jerryh, 10-15-2004 19:56:10  
I'm sorry to say I haven't seen that but that method would be THE perfect way to insure that caps are not turned around or swapped during a rebuild. Very clever use of low tech and a thumbs up if you ask me.



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Carl

10-16-2004 11:15:02




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 Re: Anyone seen how new rods are built in reply to Lee B, 10-15-2004 23:41:19  
Also would make traditional rod reconditioning impossible. Good way to sell new parts!



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Jerryh

10-16-2004 19:42:15




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 Re: Anyone seen how new rods are built in reply to Carl, 10-16-2004 11:15:02  
The only other problem is that all the caps were marked #4 with no marks on the rod end. It was like watching someone put a jigsaw puzzel together, he did look confused.



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