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Discussion Starter #1
Shearing the dist shear pins on my 521 stroker motor. New motor not much run time. Looked on 460 ford.com, seen issues and possible fixs. Tired of messing with it. Anybody over here ever had this issue? And a fix that actually works? Does anybody sell shims and how do I know how much shim to use?
 

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Discussion Starter #3
what kind of dist you running
Vertex Mag, bronze gear, mech. comp cam, non roller. I dont know if the bronze gear was maybe installed incorrectley or not. Thinking about sending it in and have another gear installed on it.
 

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mo balls than $cents$
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mornin george:D check that oil pump too, a pump that's locking up will do that too.
 

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I have to pull the motor to do that right? Man I proably dont have more than 10 hrs on that motor. Can I just put my drill motor and my oil pump primer on it and spin it?
 

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positon of gear

height of the gear is critical. you need to set it exactly right and drill a new hole through the shaft for the pin. also, how much oil pump and how heavy oil? look on 460 forum for the correct height.
 

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Discussion Starter #7
height of the gear is critical. you need to set it exactly right and drill a new hole through the shaft for the pin. also, how much oil pump and how heavy oil? look on 460 forum for the correct height.
Rotella 15/40, hi-volume Mellings, dual remote filters. Will be removeing the dual fiters now and running a 45 degree or 90 degree adapter and a single filter. 10 QT PAN.
 

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Discussion Starter #8
It also had alot of line going to the remote filters. Alot of strain to push oil through all those lines. Maybe that is some of the problem?
 

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mo balls than $cents$
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Rotella 15/40, hi-volume Mellings, dual remote filters. Will be removeing the dual fiters now and running a 45 degree or 90 degree adapter and a single filter. 10 QT PAN.
yeah, put a drill on the pump and see if it has any spots that are sticky
 

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tintingsandiego
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I have a mallory dist. and spun the pin last year on my 460. it was a .125 @ 7/8 long . I bought one @ local hardware joint. Before install I greased the shaft, as some dist. dont have enough from factory. Hasnt happened again so far, but what a buzz kill when it did. Had no idea thats all it was. Thought at first it was the module. Easy fix with center punch and all metal was still in dist.
 

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steelcomp was here
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Shearing the dist shear pins on my 521 stroker motor. New motor not much run time. Looked on 460 ford.com, seen issues and possible fixs. Tired of messing with it. Anybody over here ever had this issue? And a fix that actually works? Does anybody sell shims and how do I know how much shim to use?
Shims work, but a major PITA. Really no way to hold on to one, and one slip and it's in the oil pan. You can do it with the timing cover off, but you just have to remember the next time you take out the dist. that it's there and be real careful. If the pad in the block (that the gear rides on) is worn to the poiint this is a problem, it's probably worn unevenly and somehow the surface should be re-machined so that shim has something smooth and flat to sit on. Then you just shim the gear so it's centered on the cam. If someone wanted to get really clever, they'd come up with a Torrington bearing mod for this. I've double pinned distributors in the past. You have to be careful re-locating the gear on the shaft...you don't want to drive the smaller collar at the top of the sahft into the bottom of the dist. housing. With the dist installed and tight, there needs to be a little play in the shaft up and down so nothing is binding.
I doubt is's oil pressure related, but that's JMO.
 

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If you have good ford speed shop fords have to be measured to assure a perfect alignment on the shaft, distance from top flange to bottom of gear.
 

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CP Sleeper here on the boards was having that same issue. You might want to contact him to see what he did to correct it.
 

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Discussion Starter #15
Well went home for lunch pulled the dizzy, and sheared right off again. Pump turn freely, no binds or sticky spots. I have the chart for a BBF. Has any body have a prt # for a good pin? I used a MCMASTER carr pin, that was hardened last time with multilayers and it failed. Will check tolerances when I get the dist. repinned. right now its measureing 3.995 but it is spun now.Will get a new measurement with the gear in the right place. Dual pinning it sounds like it may make the shaft weeker?
 

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Well went home for lunch pulled the dizzy, and sheared right off again. Pump turn freely, no binds or sticky spots. I have the chart for a BBF. Has any body have a prt # for a good pin? I used a MCMASTER carr pin, that was hardened last time with multilayers and it failed. Will check tolerances when I get the dist. repinned. right now its measureing 3.995 but it is spun now.Will get a new measurement with the gear in the right place. Dual pinning it sounds like it may make the shaft weeker?
Dual pinning will weaken the shaft. There has been alot written on dist. pins and their related problems. Most of the problems I've seen have been with Mallory or Accell distributors. The common denominator is the pin itself. Mallory uses a mild steel "C" shaped pin and not a hardened spirol wound pin used in stock Ford dist. I've gotten away with pressing a smaller spirol pin inside of the "C" pin for a little extra insurance. McMaster-Carr lists several types of pins with shear strength in the specs. Running a Vertex may be too much load on anything but the best pin you can buy when you account for the load of the oil pump and the load of the mag. Rather than double pinning the gear can you go to the next bigger pin?
 

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Discussion Starter #18
Dual pinning will weaken the shaft. There has been alot written on dist. pins and their related problems. Most of the problems I've seen have been with Mallory or Accell distributors. The common denominator is the pin itself. Mallory uses a mild steel "C" shaped pin and not a hardened spirol wound pin used in stock Ford dist. I've gotten away with pressing a smaller spirol pin inside of the "C" pin for a little extra insurance. McMaster-Carr lists several types of pins with shear strength in the specs. Running a Vertex may be too much load on anything but the best pin you can buy when you account for the load of the oil pump and the load of the mag. Rather than double pinning the gear can you go to the next bigger pin?
Can I go to a bigger pin? If so which one? I have been told the mag is harder to spin than an electronc dizzy, but I like the relabilty of mags. I hate trouble shooing electonics.
Some one said something about a chevy shear pin on 460.com?
 
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