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Suspension, Handling, Brakes, Wheels and Tires
Advice on rear Leaf Spring / 71 351C 4V
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<blockquote data-quote="Stanglover" data-source="post: 357049" data-attributes="member: 3596"><p>So today, I was playing around with the Grab-A-Track 4 1/2 leaf springs because I am curious about why the axle on the right side showed to be 5/64ths ahead of the left side on the alignment bench. This and two much free arc is what I'm taking into consideration whether or not I buy new Eaton springs. </p><p></p><p>While I have to admit, my measuring method is a bit crude, I feel it is pretty close without setting them up on a surface table and blocks or on a CMM. First I inserted a 1/2" pin through both eye bolt holes. The fit was close so not too much if any play. I spaced the two springs .900" apart so that was as good as that gets. Then with a square, I found that the right spring's so called center pin was 1/16th ahead of the left one. I confirmed this by setting the square against the shackle end loop and with a tape measure, compared the two. This also showed the right spring pin 1/16th ahead of the left. As said, this was pretty crude, but it does seem to confirm why the axle was out of alignment. Of course, there is always a possibility the frame mount is off on the right side as well to add to the error.</p><p></p><p>I don't know what Scott Drake, who apparently have these made (they are not marked as such, but the shackle kit is) calls out for tolerance for center pin, but as a former machinist, I'd say that was unacceptable. It would be interesting to find out what Eaton's tolerance would be for pin to eye dimension.</p><p></p><p>Here's a few pics. Sorry about the quality, they are taken at low res.</p><p></p><p>Geoff.</p><p></p><p><a href="https://ibb.co/Sdhkbfx" target="_blank"><img src="https://i.ibb.co/mXLnkNB/IMG-1275.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p><a href="https://ibb.co/LhR1N2b" target="_blank"><img src="https://i.ibb.co/zHxZ60j/IMG-1274.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>The paper is touching both pins. The square shows the same difference from either side.</p><p></p><p><a href="https://ibb.co/LtDQ6MC" target="_blank"><img src="https://i.ibb.co/d2sb6SQ/IMG-1281.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Left spring.</p><p></p><p><a href="https://ibb.co/6NZQDZc" target="_blank"><img src="https://i.ibb.co/kMyZqyV/IMG-1282.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Right spring.</p><p></p><p><a href="https://ibb.co/n0W7djX" target="_blank"><img src="https://i.ibb.co/H2Jtwqc/IMG-1283.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Just to show the "R" (right) I put on when spring was removed.</p></blockquote><p></p>
[QUOTE="Stanglover, post: 357049, member: 3596"] So today, I was playing around with the Grab-A-Track 4 1/2 leaf springs because I am curious about why the axle on the right side showed to be 5/64ths ahead of the left side on the alignment bench. This and two much free arc is what I'm taking into consideration whether or not I buy new Eaton springs. While I have to admit, my measuring method is a bit crude, I feel it is pretty close without setting them up on a surface table and blocks or on a CMM. First I inserted a 1/2" pin through both eye bolt holes. The fit was close so not too much if any play. I spaced the two springs .900" apart so that was as good as that gets. Then with a square, I found that the right spring's so called center pin was 1/16th ahead of the left one. I confirmed this by setting the square against the shackle end loop and with a tape measure, compared the two. This also showed the right spring pin 1/16th ahead of the left. As said, this was pretty crude, but it does seem to confirm why the axle was out of alignment. Of course, there is always a possibility the frame mount is off on the right side as well to add to the error. I don't know what Scott Drake, who apparently have these made (they are not marked as such, but the shackle kit is) calls out for tolerance for center pin, but as a former machinist, I'd say that was unacceptable. It would be interesting to find out what Eaton's tolerance would be for pin to eye dimension. Here's a few pics. Sorry about the quality, they are taken at low res. Geoff. [URL="https://ibb.co/Sdhkbfx"][IMG]https://i.ibb.co/mXLnkNB/IMG-1275.jpg[/IMG][/URL] [URL="https://ibb.co/LhR1N2b"][IMG]https://i.ibb.co/zHxZ60j/IMG-1274.jpg[/IMG][/URL] The paper is touching both pins. The square shows the same difference from either side. [URL="https://ibb.co/LtDQ6MC"][IMG]https://i.ibb.co/d2sb6SQ/IMG-1281.jpg[/IMG][/URL] Left spring. [URL="https://ibb.co/6NZQDZc"][IMG]https://i.ibb.co/kMyZqyV/IMG-1282.jpg[/IMG][/URL] Right spring. [URL="https://ibb.co/n0W7djX"][IMG]https://i.ibb.co/H2Jtwqc/IMG-1283.jpg[/IMG][/URL] Just to show the "R" (right) I put on when spring was removed. [/QUOTE]
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Advice on rear Leaf Spring / 71 351C 4V
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