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Posted by Chris Case [75.36.41.249] on Wednesday, November 21, 2012 at 11:08:03 :
In Reply to: Bell housing not quite tried up... posted by Mark in nm [209.194.208.150] on Wednesday, November 21, 2012 at 09:53:38 :
The pins are there for alignment, not keeping things out of line.
Bolt holes probably have enough play to gain .005.
Lesse, six bolts with something like 20,000# pull each, = 120,000 pounds pressure, friction of .6 = 72,000# of friction between the two parts. Vs the two pins, 1/2" diameter each = total surface area of .4 square inches. Hardened steel shear strength of 100,000 psi = 40,000# of sliding force needed to shear the pins (though the iron pieces will crumble first). So, the bolts hold more than the pins. Okay, they are additive, but we don't know which way the force will try to shift the joint- might still be additive, or not.
Try another bell housing if you are worried.
Or modify the inlet nose by welding and turn eccentric? Or grien away the bid hole in the bell hoousing to allow it to line up aith the crank, then drill alignment pins in at assembly.
Or (E), remove pins at bell/engine. Align bell and bolt down tight, ream pin holes for larger pins. Keep assemble together for all eternity.
Or say to hell with it, run what you've got.
Anybody else ever take that measurement? How does Mark's compare?
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