When installing the flywheel with the transmission on do I have the transmission above the engine or is it hanging under the engine to get the right clearance on the coil ring?
The transmission should be on top so that you any endplay in the crankshaft will pull the magnets closer to the coils. The purpose is to get the magnets to be at least 25 thousandths clearance at the closest it will come in operation, such as going downhill. Adjust so that the closest magnet to the coil is no less than 25 thousandths and the farthest no more than 40 thousandths. Rotate the flywheel and check every magnet to every pole to be sure everything is within limits.
Norman, just to be clear, with the transmission third main facing up in measuring the clearance between coil centers and the magnet clamps. I measured and I have about .25 So should I take off the transmission again and add some shims to the transmission mounts itself on the crankshaft to raise the height of magnet clamps?
Here's how I did it. The engine is secured on the stand and can swivel. The hoist holds the transmission which can easily lift it out of the way. You'll find that you will lifting the transmission a few times to get the clearance correct.
I'm set up like your photo, I'm gathering I need more than .25. Do I add the shims between the crankshaft the transmission ? Or should I remove some shims from the coil ring?
I just checked again, I've got between .30 and .36. Is this good? There is just one coil that is a little high with a clearance of about .28.
According to the Ford manual you are supposed to add a few thousandth to the lower bolts of the mag ring.
In other words when the transmission is assembled in the vertical position and then lowered to the horozontial position the transmission weight causes a slight sag.
Or so the manual says.
Any thing between .25 to .45 has always worked for me.
You can spend a lot of time trying to get a level measurement all around. I have found the engine will run on mag just fine even if the measurement is not 'perfect' all around.
The main reason for having a lager play in the lower half of the mag ring is the flexing. The lower half isn't connected to the engine block and will flex much more from the engine vibrations and the flywheel magnets passing by.
Yep. Ford Service Bulletin, the lower half of the coil ring hangs off the rear of the engine block and can wiggle with Ford shakes.
Note the comment to not shim the crankshaft, once removed a trans, and low and behold, someone neatly had trimmed a round piece of roofing felt paper, with punched holes, to space the flywheel and magnets away from the coils!
Shims at the block will get you pretty close to the recommended tolerance.
Lot of back and forth to get the happy gap needed Use of that cherry picker sure is helpful for saving the back.
Here is the Ford way, you fit the flywheel and trans resting on your knees, and lift with the arms! Ugh!
The reference from the Ford service manual concerning the weight of the transmission causing the decrease in clearance is on page 85 paragraph 319 of the manual. The manual recommends to add .006 to .010 to the lower half of the mag ring height to help even things out all the way around.
Mike and Dan, those are some great picture, thanks for posting them!
Im done for today, I ended up with around .35. Two things, I did have one coil pack that was just a little higher than all the others. That was a bit close. The other, When I put it together and brought the engine back level the gap greatly increased to a little over .54. Not sure how that happened as my gap was good when the weight of the transmission was on it. When I go back next week I will address this issue. Tonight I'm tired. Thanks for everyones help.
Will you stated that the level was OK (gap was good)with the weight of the transmission was on it.
Then you stated the gap changed when you brought the engine down level.
The transmission weight caused the gap to change.
That's what it sounds like.
Sorry, I was very tired when I got home. Im getting to old to be getting up at 0400hrs anymore.
Let try and explain again. When the engine was facing down with the nose of the engine pointing to the floor and the full weight of the transmission sitting vertical on the crankshaft I had a gap of .30 to .36 all around except for that one coil that had a tight .28. When I turned the engine so that it was level with the crankshaft horizontal with the floor the opened up to over .50. Thing is when I go back on Monday and remove a couple of the shims I'm afraid that it will be to tight, especially on that one single coil that was tight to start with. Is it possible that maybe I'm missing something?
25 thousandths = .025. If your clearance is .25 you have 250 thousandths. Too much clearance. You need to add shims between the coils and the block.