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Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul!

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Lee Smith

12-16-2000 17:43:08




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My Uncle has decided to completely restore the 40. The main reason is an intermittant knocking sound coming from the front of the engine. The weird part is that it always maintains excellent oil psi at any rpm. Today I droped the wide front and pulled the engine. After going over, I believe the noise was coming from the gov assembly. The internal bushings (appear to be brass) were worn and allowing the spindle assembly too much play thus causing the fly weights(not sure of proper name)to rub against the bottom housing. The housing was shined up a good bit from the wear but is still useable. The crank, rods, and mains were in fairly good shape. But we found a real strong gas smell in the oil and pan. What are the best rebuild kits available and what brand to buy? Original Deere or our local Quality Farm and Tractor? Rebuild the gov assembly or buy a new one. We are also replacing the clutch, steering bushings-bearings, and rebuilding the radiator. Anything we should look out for along the way? As always, your comments are greatly appreciated!
One for the road, We also found a garden hose being used on the water pump and a darn brick to keep tension against the alternator, talk about jury rigging!!

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G Taylor higher compression is free power efficiency

12-17-2000 19:10:54




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 Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to Lee Smith, 12-16-2000 17:43:08  
To a limited extent increasing the compression increases power extracted from the same amount of air/fuel mixture . Less plug fouling & unburned fuel when putting around at shows & parades as well. Deere had to keep the compression very conservative to allow for 83 octane from the late 50's. Add in the factors of old fuel, continuous overloading/lugging, overheating, too lean carb etc. A set of LP pistons are a safe bet and if does knock a little with factory spark timing on 87 octane tractor gas a little premium will cure that. For a few cents more/gallon won't damage the budget for a parade tractor using a tank or two a year. Probably make it up in reduced fuel consumption per HP/hr.

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Bill

12-17-2000 16:28:57




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 Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to Lee Smith, 12-16-2000 17:43:08  
Lee-- As to the strong gas smell, you should rebuild the sediment bowl, new gasket set. You could have a leak there that going through the carb. into the crankcase. Bill



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clooney

12-16-2000 18:08:20




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 Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to Lee Smith, 12-16-2000 17:43:08  
Lee, sounds like you might have found the noise in the front of the engine. The first thing that comes to mind is if it has a water pump then it probably doesn't have a 40 engine in it, measure the cylinder bore & see if it is 4" or 4-1/4". If it is 4-1/4 then it probably has a 420-30 engine in it. On the governor I would overhaul it, I don't even know if a new one is available from deere. Check the head very carefully for cracks between the valve seats. Look the block over real close behind where the carb is as they tend to crack there if they have ever frozen. Measure the crank for out of round on the journals as they tend to wear out of round. I always use J.D parts because they seem to fit & you can buy the parts seperate. Let me know if it has a 420-30 engine in it.

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Lee Smith

12-17-2000 13:05:31




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 Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to clooney, 12-16-2000 18:08:20  
Here is the update.
The tractor sn is 40 s 71365 as on the id plate.
Engine sn is A9142 stamped on the front left side next to where the hydraulic pump bolts on. There was another sn, VIC-2-Fold stamped on top rear face of block(piston to rear of the tractor)Not sure what that means. The cylinder bore measured out to 4-1/4" This engine does use a water pump. Yet our JD parts book does not show it. Also the hydraulic pump is different than in the book. Is this the 420-30 engine you described? Was this a special hybrid or just a swapped out motor. What was the difference between the standard and special?

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clooney

12-17-2000 13:50:48




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 Re: Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to Lee Smith, 12-17-2000 13:05:31  
Lee, you definitly don't have a 40 engine in that tractor. With the 4-1/4" bore & water pump it is a later engine than a 40, (probably 420-30) that block number should help you find the year. I don't know if J.D. can help you, or you might try "Todds Tractor Pages". Try e-mailing him, as he has a very good block reference for the 40 but I don't see anything on the 420-30, he might have something, or at least know where you can find out....http://www.jd40.com/index.html

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ToddT

12-17-2000 16:15:50




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 Re: Re: Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to clooney, 12-17-2000 13:50:48  
It sure sounds to me like a 420 motor. The 4-1/4" bore, the water pump, and the block number would all suggest that.

In JR's book, "The Little Giants", Chapter 11, second paragraph: "From day one, all Dubuque two cylinder tractors with gasoline, all-fuel, or LP-gas engines had either numbers or a combination of a letter and numbers stamped on the engine block. Models M, 40, 320, and 330 tractors had only numbers, all others had a combination of a letter and a number."

I've been studying the numbering sequence of the 40's, but not the 320's or 420's. Maybe someone else could take those up!

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clooney

12-17-2000 16:37:53




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 Re: Re: Re: Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to ToddT, 12-17-2000 16:15:50  
ToddT, I sure use & like your block number chart on the 40. Thanks for taking the time to put that together. Sure wish I could find something like it for the 320-430....clooney



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Lee Smith

12-17-2000 17:56:33




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 Re: Re: Re: Re: Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to clooney, 12-17-2000 16:37:53  
Well, we have loaded up the block and head on the truck. First thing Monday morning my Uncle is taking it to the machine shop for the rebuild. I am going to call our local JD dealer and see if they can tell us what we have and what parts we can get. I will keep you all updated as we progress. Gentlemen, I thank you for the help and advice. ToddT, great job on your website.



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Ray E

12-17-2000 18:07:30




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 Re: Re: Re: Re: Re: Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to Lee Smith, 12-17-2000 17:56:33  
The 420 and 430 are different blocks.The 420
has a dip stick on the left side,and oil is
put in through the valve cover.The 430 has
a large hole and dipstick on the right side.
Oil is added to the motor through this hole.



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clooney

12-17-2000 14:01:20




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 Re: Re: Re: Re: Hey Clooney or anyone, thoughts on JD 40 standard engine overhaul! in reply to clooney, 12-17-2000 13:50:48  
Forgot about the std. & special...The std. is a standard tractor with wide front end & 24" rear rims, the special is a short hi-crop with a higher crop clearance, longer ft. spindles & 28 or 34" rear rims (I can't remember which).



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