63/64 Cadillac Website

Crank shaft bolt

I'm working on the front of the engine on my "63. Does anyone know the correct thread size of the internal treads on the crank shaft? I'd like to go into the hardware store and buy a longer bolt to use in installing the harmonic balancer and am considering securing it with a shorter bolt and washer after it's installed.

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Permalink Reply by Chris McBride on July 17, 2020 at 3:02pm

most people do not have those laying around and most home improvement and auto parts stores do not stock them. The actual bolt is 9/16" - 18 x 1 5/8" long...with a very thick large washer. This turns out to be the same bolt size used on the large front bumper end to frame brackets and I literally have buckets of them if you need one. I use a couple of the large washers behind it to firmly press against the balancer. You can also get these bolts new from places like boltdepot.com but once I figured out the bumper end bolts are the same I quit keeping them in stock. If you need one of these bolts I can set you up with a bolt and 2 washers for $10 + s/h. …Added by Jason Edge at 10:04pm on September 17, 2018

hth

Chris

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