Quote:
Originally Posted by Tom Vaught
The Drawing is fine for the most part except that center of the starter shaft vs the center of the crankshaft dimension is slightly off.
Lowering the starter or moving the starter outward does not fix the issue.
You need to move the starter on the same angle as the factory starter angle (down slightly and out slightly) for the starter to mesh properly.
If the drawing was correct the starter would function properly, it does not.
Therefore Bruce's idea of welding on the starter mount after you position the starter at the correct downward angle will actually work pretty well. The drawing has been wrong for years because Tom W made a slight mistake in the Trigonometry when he created the drawing.
Tom V.
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Tom would you mind sharing the dimensions with the rest of us? I or Gavin may have carried his error over or I transposed a number. I will check Gavins print to see if he has radius of crank center to starter center distance same as my actual functional piece and that against my notes.
I do recall on initial piece I made, I used Tom W's print and the starter dimension didnt match. It may have been for a different ring gear.(Dont know. I scrapped that aluminum piece and started on a steel plate)(The 55-60 hydramatic bell I have mounts the starter further outboard so I suppose the early flywheel has larger ring gear)
Regardless, I took a 400 and standard starter and located/measured and found distance from vertical centerline of starter, distance from crank center to that line(horizontal), vertical distance from pan rail to starter center. This was with nominal pinion to ring gear clearance of .025"(.020"-.030" spec). with those dimensions you can determine radius of starter center to crank center and put starter center in normal location (or technically another location on that radius)
Keep in mind ring gear diameter is supposed to be 13.98 its not gauranteed exact, nor is every pinion gear exact, and for that matter probably starter center to pilot isnt perfectly same as another.
THAT is WHY I suggest block plate hole slightly larger than 3.25", pilot plate hole tight fit to starter and positioning starter and pilot plate with clamp and "tweaking" till pinion/ring gear clearance is in middle range of spec, then welding pilot plate to block plate.
Mine fits nice and I've tested it with both a TCI and stock flexplate. Its homely, I made it from a not so pretty plate. I'm making another from fresh clean plate also large enough to serve as a mid plate.
Charlie I'll try to find pictures I posted or find them on my PC and re-post them for you.