Mag post

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2005: Mag post
Top of pagePrevious messageNext messageBottom of page Link to this message  By Guy D Nelli on Wednesday, June 27, 2007 - 10:03 am:

i went to switch the mag wire and the spark plug wire (mag wire is smaller) and the nut turned the post. so i had to grind down an open end to fit the nut under the terminal to hold the post from turning to get the top nut off. after it was off i tried to tighten the nut but after i got every thing back together, it was still loose. what is under the post? if i take out the 3 screws can i remove the post? or is it attached to something?


Top of pagePrevious messageNext messageBottom of page Link to this message  By John F. Regan on Wednesday, June 27, 2007 - 10:24 am:

Not sure what year car you have or if you have an OILER as part of your mag post which is common item. Assuming you have a stock setup - the 3 screws merely screw into the hogshead (bell housing) and there is a spring loaded contact that is pushing down so the mag post will come UP when you take the screws out. The connection "stud" at the top is fastened mechanically to the spring inside which has a point on it that contacts a solder "pile" inside the engine. This solder pile is located at the top of the magneto coil ring and the spring contact is supposed to dig into this solder pile and provide the connection from the magneto to the outside world. If the stud is spinning and that is your problem, you can put a notch in the end of the stud with a small hacksaw and then use a screwdriver to hold it while you tighten up the lower nut. Another way is to use 2 nuts tightened against each other to hold the stud while you tighten the lower nut but sometimes you don't have enough threads sticking up to be able to put 2 more nuts on there for the purpose of holding the stud.

It is always best to tell us WHAT YEAR your car is when posting a question, only because things changed. The early cars (before 1918 for sure) had a brass magneto post and the stud on top was part of the housing and will NOT turn or tighten up. Later T's had a mag post that screwed into the hogshead like a pipe plug.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Guy D Nelli on Wednesday, June 27, 2007 - 11:20 am:

john, i thought they would look at my profile, but anyway there is an oiler in the mag post. does that pose a problem getting it out? also there are three screws in the post 2 are a 1 inch long ,and if i remember right miced at 1.085 OD while the other one is an 1 5/32nds and 1.092 OD the thicker screw is a little harder to screw in (same thread) never knew some screws to be a few 1000 ths different but would like to know which is correct?


Top of pagePrevious messageNext messageBottom of page Link to this message  By John F. Regan on Wednesday, June 27, 2007 - 10:08 pm:

Guy:

I guess you don't want to tell me what year your car is but it doesn't really matter for this issue. The screws should be the same length for all 3 but it isn't too critical EXCEPT you don't want them to be too long since they can damage the internal mag coils if they protrude into the insides too much. Notice how thick the hogshead is and make sure the screws are long enough to fully thread into the hogshead. If your car is ealy and you have an aluminum hogshead then it is more important that they screws be the right length since if too short they can strip out the aluminum threads. The center contact on the OILER type mag post is typically a spring loaded affair with telescoping brass tubing parts that end up in a point. Main thing is when re-installing it you MUST MAKE CERTAIN that the thing is pefectly vertical when you slide it in place or you can bend the electrode in the center.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John F. Regan on Wednesday, June 27, 2007 - 10:10 pm:

Guy:

I guess you don't want to tell me what year your car is but it doesn't really matter for this issue. The screws should be the same length for all 3 but it isn't too critical EXCEPT you don't want them to be too long since they can damage the internal mag coils if they protrude into the insides too much. Notice how thick the hogshead is and make sure the screws are long enough to fully thread into the hogshead. If your car is ealy and you have an aluminum hogshead then it is more important that they screws be the right length since if too short they can strip out the aluminum threads. The center contact on the OILER type mag post is typically a spring loaded affair with telescoping brass tubing parts that end up in a point. Main thing is when re-installing it you MUST MAKE CERTAIN that the thing is pefectly vertical when you slide it in place or you can bend the electrode in the center.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Guy D Nelli on Thursday, June 28, 2007 - 08:39 am:

john, i thought you would just click on my name. it is a 1915 T roadster w/ aluminum hogshead. thanks guy.


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration