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AaronSEIA 
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 Topic: 7080 counterbalanced crank?
Posted: 12 Mar 2011 at 9:27am |
So, the other forum has a discussion going on the 7080 counterbalanced crank. One guy says it's the weight opposite the crank through, another says that it's in the dampener, another guy says that you can't call it counterbalanced if it doesn't have a counter rotating mass. All I can find is Swinford saying that it's counterbalanced with no explanation as to how. Parts book has no mention either. What makes the 7080 engine counterbalanced and why is it the only one of the 7000 series that is?
AaronSEIA
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427435
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Posted: 12 Mar 2011 at 9:57am |
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Hopefully, someone with more recent experience and more intimate knowledge will post, but my memory is that the 7080 (and 7580) engine was rated at a higher RPM than the other 7000's. This probably necessitated a better balanced crankshaft.
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Mark
B10 Allis, 917 Allis, 7116 Simplicity, 7790 Simplicity Diesel,
GTH-L Simplicity
Ignorance is curable-----stupidity is not.
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niel ev
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Posted: 12 Mar 2011 at 10:53am |
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Aaron the 7080 has a heavy built crank with a liquid filled balancer on the front like a N5 N6 it was the only 7000 series that used it Niel
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Steve M C/IL
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Posted: 12 Mar 2011 at 11:14am |
Been inside both but memory is so-so,soooo....my 220 has no counter weights,my 8070 has 4,2 on the ends and 2 in the middle.The 8070 is advertised as having counter balanced crank.True,but I expected to see "fully" counter balanced.Have seen big block Deeres with cranks like mine and cranks with weights on all throws.
The general consensus is that the 7080 and Gleaner engines turned too many rpms for the balance they had.Crank harmonics can cause self destruction when not "tuned" to rpm AND load.Deere guy whose word is trust worthy told me Deere had videoed inside an engine with high speed camera and the crank "moved" all over the place at speed under load.Makes you wonder how anything stays together,and we take it all for granted....Don't shoot the messenger.
Edited by Steve M C/IL - 12 Mar 2011 at 11:29am
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injpumpEd
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Posted: 12 Mar 2011 at 1:51pm |
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there are more counterweights on rod journals 3&4. The fluid damper was also used on them. They were only used in high rpm/high HP applications.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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AaronSEIA
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Posted: 12 Mar 2011 at 2:15pm |
Thanks for the info. I think the guy saying that it was not counterbalanced was working on the assumption that the counterbalance needed to be some other kind of rotating weight. I think some car engines use something that rotates oppoiste the crank for balancing.
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Hurst
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Posted: 12 Mar 2011 at 2:57pm |
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I think what you're thinking of is a balance shaft assembly. That's used in 4 cylinder (and manybe odd number cylinder engines? not for sure) to help balance the forces of the crank, as it is unstable in one direction.
Hurst
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randy
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Posted: 12 Mar 2011 at 5:06pm |
I just checked the parts book, a 7080,8050,8070 all have different cranks and dampner. I did some checking when i had my 8070 apart, and a pulling friend said there were 2 different cranks, West German and Great britan, not sure on Great Britan, but mine had a West German crank. He said the west german would take much more hp than the other. I looked up the fluid dampner and yes it is designed for more rpm and hp. West German was stamped in the crank .
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CA WD WD45 D17 D17 Diesel 7060 8050 8070
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TexasAllis
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Posted: 12 Mar 2011 at 6:12pm |
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According to Merriam Webster it is a weight that balances another
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DrAllis
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Posted: 12 Mar 2011 at 6:21pm |
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Engines that have the counter-balanced crank are used in 7080-7580-N5-N6-R5-R6-8070 and 4W220. All of these also used a fluid (viscous) filled crank pulley dampner instead of the usual rubber type dampner. Don't care what the parts book says, an 8050 doesn't have a counterbalanced crank....it is in error.
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randy
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Posted: 12 Mar 2011 at 7:55pm |
Parts book says 8070 IS different than 8050
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CA WD WD45 D17 D17 Diesel 7060 8050 8070
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