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Tractor Talk Discussion Forum

Joh Deere Vibration

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MG

08-23-2004 06:56:34




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Please save your jokes for the end of any suggestions. I got a '48 John deere BW in trade for some work I did. It sat in a barn for 5 years and all we had to do is add some clean gas and charge the battery and it started right up. The 42" Firestones are about new and there are no cracks of welds on the wide front.
Now the bad stuff, when you put the power on in any gear there is a terriable vibration. Now the prior owner says that he replaced the flywheel and the flywheel bolts keep comming loose. Why would it do that, all I can think is that the crank is bent, any suggestions?

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Mike N Mo

08-23-2004 11:08:09




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 Re: Joh Deere Vibration in reply to MG, 08-23-2004 06:56:34  
If you can"t find any marks on the flywheel to line up as suggested below, a quick check to find out if the flywheel or clutch driver is indexed correctly is to use a piece of wire thru the spark plug hole to get the piston on top dead center, and check to see if the counterweight is exactly opposite(at the3 o"clock position on the flywheel or 9 o"clock on the clutch driver). Use the wire to feel when the piston is at the top. Mike

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Weirsdale George

08-23-2004 23:32:29




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 Re: Joh Deere Vibration in reply to Mike N Mo, 08-23-2004 11:08:09  
You can also check flywheel orientation by seeing if the LH Impulse mark lines up with the crankcase mark when the mag trips.



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Rockin' Farmer

08-23-2004 08:29:21




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 Re: Joh Deere Vibration in reply to MG, 08-23-2004 06:56:34  
MG,

I'd say the flywheel was not put on correctly. Should be some index marks on the flywheel and crank. If not, check out the JD board on this site. One of the guys there should be able to tell you how to get 'er back in balance.

Rockin' Farmer



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Super Lurker

08-23-2004 07:18:28




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 Re: Joh Deere Vibration in reply to MG, 08-23-2004 06:56:34  
Sounds like the previous owner put the flywheel back on in the wrong place. There are marks on the flywheel and crank that must be lined up for proper balance. If the flywheel or clutch driver or both are not lined up in the proper position on the crankshaft, you can get alot of vibration. More than enough to cause the flywheel bolts to work loose.



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Mike M

08-23-2004 07:08:10




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 Re: Joh Deere Vibration in reply to MG, 08-23-2004 06:56:34  
They must have put the fylwheel back on wrong so now it is not balanced.It should have a screw in a spline that goes in a deep spline not at the split part of the fylwheel. You may also want to check the clutch driver as it needs to be in the right spot also should have V marks that line up.



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Super Lurker

08-23-2004 08:33:04




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 Re: Joh Deere Vibration in reply to Mike M, 08-23-2004 07:08:10  
I have an A that doesn't have the screw in the crank but had punch marks on the crank and flywheel as line up marks. Hard to see with any oil and dirt on the end. I also have a G that has the V on the clutch driver and a punch mark on the crank. However they're marked, everything must be lined up right to get the correct balance.



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MG

08-23-2004 10:37:47




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 Re: Joh Deere Vibration in reply to Super Lurker, 08-23-2004 08:33:04  
What if it is a replacement flywheel? I imagine individual flywheels are balanced separately from other components, is that correct?



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G-MAN

08-23-2004 10:50:36




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 Re: Joh Deere Vibration in reply to MG, 08-23-2004 10:37:47  
The rotating assemblies were balanced together at the factory, i.e. the crank, clutch driver and flywheel were "matched" - I don't know if the pistons and rods were done with them or not, but I wouldn't think so. So installing a replacement flywheel or driver would technically throw the engine out of balance. But, when dealing with a big, slow-speed engine with huge parts, it's not much of an issue. Installing aluminum pistons will do the same thing, and make the engine tend to vibrate more than normal. What I don't know is if they marked every crank/flywheel/driver in the same location on the end.

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