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John Deere Tractors Discussion Forum
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D Crankshaft differences.

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Aberdale Farm

07-31-2005 15:41:59




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I have a late model 1927 D (SN 54923). The early '27 Ds had 6 1/2" bore, while the late '27 Ds had a 6 3/4" bore. At the same time the bore was changed, the crankshaft was also changed. (at SN 53388) Does anyone know the differences between the early crankshafts and the later crankshafts? (Early crank is D104R, late crank is D1162R).

I believe both are splined and doweled for the flywheel and clutch drive disk. Did the stroke change? Did the counterweights change?

Dale

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Glen in TX

07-31-2005 17:51:07




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 Re: D Crankshaft differences. in reply to Aberdale Farm, 07-31-2005 15:41:59  
On some of the early 27s and earlier Ds the flywheel will be keyed instead of splined.



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skip 33652

07-31-2005 19:12:30




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 Re: D Crankshaft differences. in reply to Glen in TX, 07-31-2005 17:51:07  
there were sveral different cranks for the d'sbasically fall into four catagories 1. early spoker to late 27 all had a keyed flywheel 26" spoke 24" spoke nickle hole and newer keyed crank. 2. the 28,29 early 30 splined flywhee 3. late 1930 crank had the styled d rod journal but still used earlier clutch this crank is some different from the later cranks 4. the 1931 and up crank.to futher complicate this deere made a heavier replacement crank for the early tractors.all had seven inch stroke.

if you have balance problem it is either unblanced piston one a lot heavier than the other or the wrong flywheel on the wrong crank.

ther were at least three posibly four different flywheels for the splined crank 28-29 30 31 and up??? each was balanced a bit different

get a parts book or get us some part #'s of crank and flywheel and we will try to help.

just a note here an early d does not run as smooth as a newer b or a in fact it continues to amaze me how well those old tractors survived for as much as they rattled and shook for 50 years or more.Paul

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Aberdale Farm

07-31-2005 19:45:57




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 Re: D Crankshaft differences. in reply to skip 33652, 07-31-2005 19:12:30  
Paul, thanks for your response. Yes, I've had someone else tell me "That's just how they run." However, if I set it over half throttle, it feels like it's going to shake itself apart. Is that normal? Could be, since I've had little experience with Ds, and maybe I'm just expecting too much.

I have been matching part numbers to the manual, and it looks like I have a mixed bag of part numbers.

My D is SN 54923, which makes it a late 1927 model. My flywheel is correct, D1053R
My clutch drive disk is correct, AD380R
My pistons are correct, D2822R
My connecting rods are correct, D103R
My crank appears to be from an earlier D, D104R if I am reading it correctly. (It is cast into the counterweight between the rods.)
According to the parts manual, my crank should be D1162R.

However, my D104R crank is splined rather than keyed. So it seems like it must be a later model crank, since the D104R crank should take a keyed flywheel, right? Does any of this make sense? Would someone go to the trouble machining splines on an older crank? Would Mother Deere have left the old part number cast into the newer cranks?

Hopefully I haven't confused you as much as I already am.

BTW, an earlier post mentioned as you did, that the pistons may be different weights. I pulled the pistons out last Friday and weighed them both with the connecting rods and caps. They both came within a couple ounces of 32 lbs, so I think they are OK.

Any thoughts on the crank and flywheel?

Dale

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Aberdale Farm

07-31-2005 18:32:58




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 Re: D Crankshaft differences. in reply to Glen in TX, 07-31-2005 17:51:07  
Glen, the cranks prior to SN 30400 must have been keyed. Because the D104R crank was used from SN 30400-53387, and it is splined at both ends. The D1162R crank was used from SN 53388-94800, and it also is splined on both ends. At least thats what it looks like in the parts book, if I'm reading it correctly.

The gears are turnin' in my head, and I'm thinkin' that if the piston went from 6 1/2" to 6 3/4" at SN53388, then the pistons probably got heavier, right? If that's true, then the later cranks probably have slightly larger counterbalances, too. If my late D has the early crank, it might be the reason I'm having some excess vibration. If the stroke was also shortened, then that might explain why the oil ring is coming down so far, and why it seems to have so much compression I can hardly spin it over.

I sure would like to look at both cranks side by side!


Dale

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Glen in TX

07-31-2005 18:51:50




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 Re: D Crankshaft differences. in reply to Aberdale Farm, 07-31-2005 18:32:58  
Sometime in 27 the keyed cranks and flywheels were changed to the splined type. The 27 D we had #47229 had the keyed crank and flywheel yet had been converted to the 6 3/4" block.



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Aberdale Farm

07-31-2005 19:17:22




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 Re: D Crankshaft differences. in reply to Glen in TX, 07-31-2005 18:51:50  
Glen, I just pulled my "John Deere Tractor Data Book" by Lorry Dunning, and it confirms what you are saying about the keyed flywheel up to SN 53387. I am a bit confused, now. The part number on the crankshaft in my tractor is D104R. The D104R was used in tractors SN30400-53387. So my crankshaft should be keyed, right? But it's splined! What kind of a cobbled up mess do I have? Could it be a later crankshaft, but still have the cast-in part number from the earlier version? Or could someone have splined an earlier model crank?

I'm really getting confused, now.

Dale

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Glen in TX

07-31-2005 20:32:43




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 Re: D Crankshaft differences. in reply to Aberdale Farm, 07-31-2005 19:17:22  
Dale, I read the part numbers and you need the D33R / AD305R flywheel to go on that crank you have. It shouldn't run as rough as you describe although they don't run as smooth as the later 2 cylinders.



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