Pinning an LS crank: So in a effort to not pay $80 for a drill bit and a jig I decided to devise my own tools for pinning a crank. Turns out it worked. Here’s what I did. I had a 2” x 2” hunk of aluminum bar stock. Drilled a 5/8 hole in the center (little smaller than 16mm, but sand down the bolt shank to get it to fit) in the middle with a 1/4” hole on center with the snout and the balancer line. Take an old crank bolt cut the top off, sand down the shank to slide into the 5/8” hole in the jig. Drill and tap a 8mm x 1.25 thread so you can hold the jig to the bolt you’ll thread into the crank to center the jig. Take an old 1/4” drill bit and cut the shank off to 0.750” Take your pulley off and install the jig. I ended up replacing the pulley with a new one for kicks. Drill your hole 0.900”. your balancer will sit off the snout about 0.150” so you’ll need to drill deeper to get the 0.750” pin in the hole. You don’t want it to be flush with the balancer because it’ll pull in as you tighten the crank bolt. There can be a gap. I used a pneumatic 90 degree drill with a regular 1/4” drill bit. The metal is cast, so it takes about 2 min to drill 0.900” deep. On a side note, if you pick up a cheap $12 set of spring compressors from harbor freight, coincidentally they have the same pitch as the crank bolt. You can use that bolt and nut off it to press the balancer on. I actually used the aluminum jig between the nut and balancer as a stand-off/washer to drive the pulley on the crank. Worked like a charm. I have $18 into the setup. All $18 went to the 5/8 drill bit from home depot.
Posted on: Sat, 03 May 2014 03:58:58 +0000
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