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John Deere Tractors Discussion Forum
Show Parts for Model:

8650 crankshaft damper

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skip33652

04-16-2018 19:13:43




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ok guys I am rebuilding engine in an 8650 john deere. the damper on there now was replaced at overhaul in 1995 abou 9,000 hours ago. We all know it should be replaced BUT--- the damper re10879 is $904 which is too high and that we all know as well. I discovered that a 9610 combine ( whiuch actully has 2 dampers on it) has a part # re57604 ($560)looks and measures identical to the re10879. so is it the same or different will it work or don't chance it thanks for all imput Paul

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fdt860

04-17-2018 22:55:08




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
For the record, now that you have swallowed the extra $350, it would be nice if you could dissect that dampener and a junk 4640 one and find out why they are different part numbers.



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skip33652

04-17-2018 21:19:32




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
Upon looking further an 8630 uses an ar70834 damper which is the same damper that is on 4640. under most cases an 8630 has an 8650 engine in it .but still uses 8630 pulley and damper . confusing but I will go with oem 8650 damper>



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Roger in Iowa

04-17-2018 18:39:01




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
The rubber in the dampener may be different and you cannot tell by looking.



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Tx Jim

04-17-2018 09:45:03




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
I'll bet JD parts with different part numbers are not identical.



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skip33652

04-17-2018 17:24:34




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 Re: 8650 crankshaft damper in reply to Tx Jim, 04-17-2018 09:45:03  
I can tell you this without the part numbers no one could tell them apart.



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2002sliverado

04-17-2018 07:39:11




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
The owner already has quite a bit of money tied up into the engine overhaul already. If it can be proven these are the identical part, then I see no harm, but what looks like is the same may not be the same. For the added $344, I think it is "chump change" in the bigger picture of this. I guess I have tried to do it right, or not do it at all, or wait until I can afford to do it right.



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skip33652

04-17-2018 17:40:47




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 Re: 8650 crankshaft damper in reply to 2002sliverado, 04-17-2018 07:39:11  
the tractor is mine and I will probably buy the 8650 damper for the reasons you and others have mentioned but $350 is never chump change but ya I get it . I should have taken picture when I had both dampers on table .they look and measure the same



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matthies

04-17-2018 05:48:37




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
Did you check with A&I for an aftermarket one? Local dealer keeps dampners for 4320 on hand since OEM are so expensive. At least the aftermarket would be designed for that engine.



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skip33652

04-17-2018 17:35:36




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 Re: 8650 crankshaft damper in reply to matthies, 04-17-2018 05:48:37  
a&i does not make one for this application I know they (A$I) do offer others like 4630.I found an outfit that rebuilds 4440 style but they cant or wont do the 4630 style wich is made kinda like the 8650. Paul



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Bob

04-17-2018 05:31:40




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
Crankshaft dampers are made to smooth out torsional stress loads on the crankshaft.

It is quite an assumption on your part that the mass and specific design of a damper for a 8.1 liter engine would be the same as one for a 10.1 liter engine. (Although, it certainly MAY be possible.)

Are you willing to risk engine destruction on that assumption?



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skip33652

04-17-2018 17:31:41




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 Re: 8650 crankshaft damper in reply to Bob, 04-17-2018 05:31:40  
is not an asumption based on anything except both dampers look identical and measure identical except for the part numbers .



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JD Seller

04-16-2018 20:56:48




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 Re: 8650 crankshaft damper in reply to skip33652, 04-16-2018 19:13:43  
The 9600 combine one is balanced differently IRC. I would not risk it myself.



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Kent Petersen

04-18-2018 15:21:29




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 Re: 8650 crankshaft damper in reply to JD Seller, 04-16-2018 20:56:48  
The key word here is Damper that dampens the torque twist in the crankshaft does not have any thing to do with balance



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skip33652

04-16-2018 21:19:24




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 Re: 8650 crankshaft damper in reply to JD Seller, 04-16-2018 20:56:48  
both are neutral balanced.they bolt on with six bolts and or six different positions possible to bolt on



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