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05-03-2016, 02:18 PM | #1 |
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coupler pin (40) Ford
Saw the subject being brought up about the driveshaft coupling pin, and that reminded me about a question i have.
I had the rear end apart and reassembled a LONG time ago, and i don't seem to remember if i put the Pin in. Question is : what would the symptoms of that disaster. |
05-03-2016, 02:21 PM | #2 |
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Re: coupler pin (40) Ford
Addition to previous post::: (car is not on the road)
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05-03-2016, 02:31 PM | #3 |
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Re: coupler pin (40) Ford
It will eventually destroy the splines in the coupler. Not sure how long it would take.
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05-03-2016, 02:45 PM | #4 | |
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Re: coupler pin (40) Ford
Quote:
Nope, I believe the pins were utilized to stop the fore and aft movement of the drive shaft. If the spine fit was loose a pin would soon enough be sheared.
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05-03-2016, 05:13 PM | #5 | |
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Re: coupler pin (40) Ford
Quote:
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05-03-2016, 05:51 PM | #6 | |
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Re: coupler pin (40) Ford
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Quote:
I am not saying I am correct on this and sincerely would like to hear from others that may have information that would support another reasoning for the pins. Like you, I have seen splines on these shafts that were destroyed -pins sheared. I always wondered how that destruction came about. Kind of on the same subject... does anyone know why Mercury shafts were welded vs. the Ford shaft coupled?
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05-03-2016, 05:58 PM | #7 |
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Re: coupler pin (40) Ford
LOL, I also started life as a tool & die man and ended it as an engineer. Greetings brother!
Hear where your coming from, but depends on a lot of things in a car environment. I don't really have any personal insight on this one one way or the other. |
05-03-2016, 06:42 PM | #8 |
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Re: coupler pin (40) Ford
The value the pin could add to a spline fit is it would limit lateral movement back and forth during braking and acceleration which might wear the .0015 fit somewhat. That is jut and opinion from a one time machinist, that has no personal experience to back up the seat of the pants theory. I believe I put the pin in the spline in '40 rear end in the roadster, but not sure or concerned about it.
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05-03-2016, 07:11 PM | #9 |
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Re: coupler pin (40) Ford
I think that the pin keeps the drive shaft located forward and aft. With a broken pin, I think that the ujoint could be stressed a bit by a drive shaft being too far out of it's geometricly correct position. Not so much when the transmission shaft and the drive shaft would be perfectly in a straight line, lots more when there's an angle between the two. On the other hand, this stress would tend to force the drive shaft into it's correct position.
I've taken a few of these apart. found pins broken when splines were in bad shape. There's some I've found that have a spring like strap that goes half way around the shaft, pin ends rivet through holes at each end. This keeps the broken pin parts from going through the pinion gears. I like that. Karl |
05-03-2016, 07:44 PM | #10 |
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Re: coupler pin (40) Ford
Im not an engineer. The pins are quite 'soft' personally it might stop some fore and aft but I think they are just to help hold the sleeve in its position not much more.
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05-03-2016, 11:44 PM | #11 |
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Re: coupler pin (40) Ford
I've used a simple spring pin instead of the peened over factory pin. It was all I had at the time. I thought it might not work ok, but it seems to be just fine.
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05-04-2016, 09:34 AM | #12 |
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Re: coupler pin (40) Ford
My 1935 was missing the pin when I bought the car. Drove it many miles that way. When I rebuilt the rear end the only damage was the universal joint which may or may not have been the result of not having a pin. I use a Grade 8 1/4" bolt in place of the pin with the nut tack welded on.
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