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Does a John Deere 2 cylinder...

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David Ransom

05-28-2002 21:09:51

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Does a John Deere 2 cylinder stop with the cranks in the crankshaft pointed down, or is the flywheel weighted to cancel this out?

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JDM Guy

05-29-2002 03:50:35

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Re: Does a John Deere 2 cylinder... in reply to David Ransom, 05-28-2002 21:09:51

The whole engine is balanced with the fly wheel and clutch.

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Pappy

05-28-2002 22:25:51

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Re: Does a John Deere 2 cylinder... in reply to David Ransom, 05-28-2002 21:09:51

The journals on the crank are 180 degree opposed, and the flywheel, also the clutch drive disc, are weighted to balance the engine.

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Larry W.

05-29-2002 05:12:19

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Re: Re: Does a John Deere 2 cylinder... in reply to Pappy, 05-28-2002 22:25:51

I,m not so sure about the 180 degree thing Pappy. I always thought it was more like 60. Like the Harley engine.

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Bob Weber

05-29-2002 09:56:56

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Re: Re: Re: Does a John Deere 2 cylinder... in reply to Larry W., 05-29-2002 05:12:19

Harley engine uses a common crankpin, and one rod fits inside a fork of the other. The cylinders are splayed at 45 degrees, so the firing is actually much smoother than a 2 cylinder John Deere. Front cylinder fires, then crank rotates 315 degrees, rear cylinder fires, crank rotates 405 degrees, front cylinder fires, etc. On a JD it's 180 degrees between firings, then another 540 degrees before the next firing. On some of the models you can barely hear that second cylinder fire because it's right after the first. Put a load on 'em and you can hear both firing.

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F-I-T

05-29-2002 05:40:25

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Re: Re: Re: Does a John Deere 2 cylinder... in reply to Larry W., 05-29-2002 05:12:19

Larry W:

No, they're all 180* crank throw relationship. They go "Putt-Putt-coast-coast". Never had a Harley apart, but maybe the V block design has sonething to do with their crank journal angle.

Frank-in-Tallahassee
70D // 855

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David Ransom

05-29-2002 07:02:51

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Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to F-I-T, 05-29-2002 05:40:25

In that case, wouldn't it be impossible to unhook the connecting rods from the crankshaft without splitting the tractor?

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mike

05-29-2002 17:15:37

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Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to David Ransom, 05-29-2002 07:02:51

Pull the head off and see whats going on in there.It will come off easily as it is made to take out with hood and fan shaft left on it will slip out when turned. pull off top cover off crankcase one rod may be in position to unbolt one piston may not be stuck
and you might be able to get it out if both are stuck you can unbolt the block and slip it forward in the frame as you unbolt the rods this can be done in less time than it took at the computer for all your posts. when you get the block out if the pistons are still in it turn it upright and soak with fuel oil
longer is better than take a wood block that fits bore tight and a sledge and beat the pistons out. this has worked countless times for me as I have parted out many tractors in the past. One time I used a steam cleaner to warm the block up left it spraying in block while I drove pistons out. I also had a H block couldn't get them out filled it with fuel oil and left it sit in back of shed upright forgot about it for a year went back and they came out with very little effort. moral of the story is if you want it freed up you have to dig in and do it.

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F-I-T

05-29-2002 08:09:41

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Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to David Ransom, 05-29-2002 07:02:51

David:

I'm not sure I understand what you mean.

The crank throws are 180* offset. If they were on a common throw, the engine would fire "Putt-Coast-Putt-Coast". And that's not how it works.

To service the rods, you unbolt one rod, rotate the crank slightly, then the other. As the rod nears BDC, it comes close to the aft wall of the case, too close to get a sizable wrench in there.

Robert's has an animation that is helpful.

Frank-in-Tallahassee
70D // 855

http://www.robertscarbrepair.com/2cyl_an4.gif

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Larry W.

05-29-2002 15:41:33

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Re: Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to F-I-T, 05-29-2002 08:09:41

Thanks Frank, I never looked close enough I guess when I had them torn down. Never pulled a crank, just rods. You have straightened me out until the next time I make something up. I am currently working on an Oliver 1800 with a bad injector pump and lots of oil all over every where. It is my first diesel, and has already been a learning experience.

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F-I-T

05-29-2002 18:19:04

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Re: Re: Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to Larry W., 05-29-2002 15:41:33

LArry:

A-hhhhh ! Your first diesel ! If you don't have any black t-shirts yet, you will !

Enjoy it ! I really like the diesel side of things. Just don't ever put your finger or other body part in front of those injectors when they index....I'm told it can inject fuel right into your skin and underlying tissues !?!?!

Frank-in-Tallahassee
70D // 855

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Larry W.

05-30-2002 05:22:36

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Re: Re: Re: Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to F-I-T, 05-29-2002 18:19:04

Frank, Yeah, diesel injected into the body can cause all sorts of problems. It can be worse than snakebite. Can cause terrible blood infections and eventually kill you. Lots of guys have lost fingers and hands. Nasty stuff. thanks for the reminder. If it ever happens to anyone on this board, get to the doctor right away. don't ignore it. (I'm not making this up)

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David Ransom

05-29-2002 08:18:40

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Re: Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to F-I-T, 05-29-2002 08:09:41

1) I had thought it was putt coast putt coast. I was definitely very wrong.

2) The reason for unhooking the rods would be to try to get the pistons unstuck, because something, probably the pistons, is holding the crankshaft still.

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Jerry S

05-29-2002 07:21:04

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Re: Re: Re: Re: Re: Does a John Deere 2 cylinder... in reply to David Ransom, 05-29-2002 07:02:51

Actually, splitting the tractor won't help get to the rod nuts at all. The main case has the transmission and the crankshaft in one cast piece. Take that cover off your motor between the flywheel and clutch pulley and get to looking at it. Might have to get your third elbow to get the wrench on the nut but should be able to get to it.

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