Sorry for all the questions!! I'm used to working on muscle cars. This is my first ever tractor. I was checking out everything under the hood now that it's off and checked the cap and rotor. The rotor is so loose that it's wearing into the bottom terninal of the cap. I pulled the bracket that holds the rotor in place and the rotor basically fell off. Shouldn't it be tighter on the end of the shaft?? I can put the rotor on any way I want. Isn't there something to index it on the shaft??
Thanks again for any and all help!!
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Ignition rotor.
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- 5+ Years
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1935 JD "B"
Kubota BX2380
Ignition rotor.
Scott
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- 10+ Years
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Re: Ignition rotor.
Yes the rotor, and matching shaft have a flat side. There is nothing that actually holds it on it just slides on and tha cap traps it in place.
Thackery
Thackery
1953 Cub, Sickle Mower, 42" Mower, Cultivators, 189 Double Plow, 54 Blade, Grader Blade
1968 Lo-Boy w/1000 Loader, 1957 Lo-Boy w/FH, FH Disc, FH Potato Plow.
1968 Lo-Boy w/1000 Loader, 1957 Lo-Boy w/FH, FH Disc, FH Potato Plow.
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Re: Ignition rotor.
Lets back up a little here. This is a '49 isn't it? It would have started with a magneto. If it still has one, the rotor turns on a smooth round shaft. It is driven by a small pinion gear. Timing the rotor requires aligning timing marks on the rotor and the pinion. Since the rotor goes 1/2 the speed of the pinion, their are 2 ways to align the marks. One is right, the other 180 off. Read more details here:
viewtopic.php?f=140&t=83108
If it has been converted to battery ignition, a different story applies.
viewtopic.php?f=140&t=83108
If it has been converted to battery ignition, a different story applies.
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Re: Ignition rotor.
Jim has you covered on this one. I reread your posts and I'm not really sure what you are dealing with on the ignition system. Pictures might help but before you go jumping from one thing to another a definitive assessment of your tractor's electrical system will save you a lot of time, agrivation and probably expense also. Just my thoughts. Stan
EDIT: You can get all the specifics by downloading the service manual GSS 1012 from the manuals link at the top of this page.
EDIT: You can get all the specifics by downloading the service manual GSS 1012 from the manuals link at the top of this page.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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1935 JD "B"
Kubota BX2380
Re: Ignition rotor.
Yes it's a 49. It still uses the magneto. I just assumed that the rotor had some way to index it like a car. There is so much slop in it I'm surprised it ran as well as it did!! I'll get the tune up parts ordered and go from there.... Now that I'm not sure exactly which way the rotor was pointing I have more fun to figure out!! I sure appreciate all the help.
Thanks,
Scott
Thanks,
Scott
Scott
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Re: Ignition rotor.
Qtr Milr wrote:. . . Now that I'm not sure exactly which way the rotor was pointing I have more fun to figure out!!
Two ways, both require aligning the timing marks on the rotor and pinion:
1) Guess. Put it in one way and see if it will start. If it doesn't, reinstall the rotor 1/2 turn around.
2) Turn the engine to TDC compression on #1. Install the rotor pointing to #1 (about 2 o'clock) so the marks are aligned.
Both of these shortcuts assume the plug wires are in the right places.
- Glen
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Re: Ignition rotor.
Hi,
I think Thackery gave info for a Battery Ignition rotor, so if you have a magneto, it is different.
I think Thackery gave info for a Battery Ignition rotor, so if you have a magneto, it is different.
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Re: Ignition rotor.
This happens after long term use. The metal tang on the rotor and the distributor cap center terminal wear out. Both the rotor and distributor cap should be replace.Qtr Milr wrote:The rotor is so loose that it's wearing into the bottom terminal of the cap.
This is not to interject on the original discussion topic.
I have an excuse. CRS.
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1935 JD "B"
Kubota BX2380
Re: Ignition rotor.
Great info!! Thanks again. I'll be replacing cap, rotor, wires and plugs. Ought to run like new!!
Scott
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Re: Ignition rotor.
Remember to get a rotor for a magneto and you might check the pinion for wear, if still original it should also be replaced. (BTW-they aren't cheap)
- Glen
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Re: Ignition rotor.
Hi,
Clean out the old grease and dirt in the area around the rotor gears, and then grease the rotor and pinion gears when you put it together.
Clean out the old grease and dirt in the area around the rotor gears, and then grease the rotor and pinion gears when you put it together.
- clodhopper
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Re: Ignition rotor.
you might want to sit down before you look at the price of a mag rotor and pinion....
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1935 JD "B"
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Re: Ignition rotor.
Too Late!! Oh well. My rotor is a crispy critter and the cap is the same......
Scott
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