Magneto clearance??

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Model T Ford Forum: Forum 2014: Magneto clearance??
Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew Temple on Wednesday, September 03, 2014 - 01:43 pm:

I am mounting my flywheel to my engine trying to set the gap between magnets and new field cool ring The field Coil ring came from Wally. I have the block upside down oil pan up right now on my workbench. When I checked the gap between the magnets and Firld coils at 12 o'clock position
( remember engine is oil pan up right now) I am showing a little over .025 but within the tolerance of the .025 to .040 recommended. at the bottom of the field coil around 6 o'clock where the magneto post would be I'm showing almost no clearance whatsoever possibly .001-.002. Any idea what's going on.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Wednesday, September 03, 2014 - 02:24 pm:

The rear of the engine should be facing up. Prior to assembly, the magnet height has been set so they are all close to equal height. You will need the special tool to accomplish this task. Also, good idea to recharge the magnets at the same time. Once this is done, bolt the transmission to the crank flange. You then need to add or reduce the shims behind the field coil top get the desired clearance. Mark and use your highest magnet using a feeler gauge. A clearance of about .025 top and .035 bottom is optimal. Opinions will vary.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew Temple on Wednesday, September 03, 2014 - 02:29 pm:

Ok thanks. I recharged the magnets yesterday. Is the tool used for setting how high the magnets are?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Andre Valkenaers on Wednesday, September 03, 2014 - 03:16 pm:

Matthew,

Here the tool and the way I did it.
Gauge blades are for measuring the spacer you need.

Good luck

Andre
Belgium


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Wednesday, September 03, 2014 - 03:21 pm:

Is the flywheel and the magneto ring bolted down? If it is bolted, you have something wrong. Turn the engine on end so that the flywheel is up. The crankshaft should be free to move forward. Do not support the engine by the crankshaft but by the block. When you rotate the flywheel, if the clearance is very different from one side of the flywheel or from magnet to magnet, you need to set the magnet height with the tool mentioned above. The are posts with pictures describing how to do that. If the distance remains very much closer at the top where the magneto contact is, even when you rotate the flywheel, you have to remove shims behind the top two bolts of the magneto ring. Actually remove some from the bottom but more from the top. When you get everything shimmed correctly, the top and bottom of the flywheel will be between 25 and 40 thousandths. at all magnets at all locations around the ring.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stephen D Heatherly on Wednesday, September 03, 2014 - 05:58 pm:

Is the transmission shaft in the flywheel?

Stephen


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew Temple on Wednesday, September 03, 2014 - 06:18 pm:

Yes!! I never took the trans apart. Is that a problem?? I can and will if that's what I need to do. I see where you can buy one of those tools from langs but after buying all of what I have bought it's just not going to be bought right now is there any other way to do the same without the tool. All advice has been great keep it coming.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Craig Anderson, central Wisconsin on Wednesday, September 03, 2014 - 08:06 pm:

Matthew......a good magnet and a coat hanger come to mind for an indicator....... ;)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew Temple on Thursday, September 04, 2014 - 04:14 pm:

I know y'all are probably tired of stupid questions! So just laugh and try to tolerate mine. I set my engine upright like it was suggested where the crank will turn. Then set a dial indicator on a magnetic arm on the end of the crank. Will this work for checking the height of the field coils or is there to much play in the end of the crank. The rear main is set at .0015 didn't know if this would cause a problem. I played with it for a few min and got some wild numbers at first but off to the real job now. I'll play with it some more tomorrow. Don't hold back tell me what you think.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Thursday, September 04, 2014 - 04:20 pm:

Use a feeler gauge between magnets and poles. The minimum should be not less than 25 thousandths and the maximum no more than 40 thousandths. Rotate the crankshaft and check every magnet against every pole to be sure the clearances are good all the way around. Preferably the bottom of the coil ring is a little farther than the top, but in no case should it be less than 25 nor more than 40. The spacing is accomplished by placing shims between the block and the coil ring. It might take several fittings before you get it right.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew Temple on Thursday, September 04, 2014 - 04:28 pm:


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ted Dumas on Thursday, September 04, 2014 - 09:49 pm:

Your dial indicator should be fine if will hold it's position as you move from pole to pole. You should be able to set the magnet height with a dial caliper or mike.

The job can be readily done without the K. R. Wilson special tool. I built a sling for the transmission and used a hoist hung from the ceiling which made the job much easier. You need to make sure you have the right clearance as you rotate the flywheel to each magnet position. You want a little more gap at the bottom of the engine as it will sag a bit when you rotate the engine to its horizontal operating position. Check you clearance in the horizontal position before you are done.


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