Crank pinning instructions
04-01-2007, 12:45 AM
#1
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Crank pinning instructions It is a ATI side pinning kit (not from the end). I am ready to do it but no instructions came with it and they are closed until Monday. I have searched everywhere. Can anyone help with this? If it is too much to explain I guess I will wait until Monday. Thanks in advance, Ken.
04-01-2007, 01:12 AM
#2
Mine came with instructions, here they are:
Using ATI's crank pin drill fixture kit, you can install 1 or 2 dowel pins in the LS1 crank to eliminate the damper twist on the shaft - a must for engines used for circle track racing or supercharging!
Note: All drilling and reaming dry - no lubricants or cutting oils are necessary!
1. Remove the damper
2. Install the fixture to the crank and position 1 bushing hole for best drill access
3. Using the old crank bolt, lock the fixture to the crank so it can not move
4. Install the 11/64 bushing in the adapter and snug the holding screw
5. Using the 11/64 drill bit, drill through the crank to the center bore
6. Change the bushing to the 3/16 bushing and ream the 11/64 hole to 3/16 with one pass in and out at low RPM.
7. For a second pin at 180^, rotate the crank. Do not loosen bolt!
8. Repeat steps 4, 5, and 6 on the opposite side if you are installing 2 pins
9. Blow the outside and center bore clean of all chips before removing adapter. Then remove adapter.
10. Install the 3/16 pin , allowing it to protrude above the crank surface .093" to fit the keyway in the hub.
11. Install the damper and pull it tight to 200 ft/lbs with the old bolt
12. Install a new bolt (GM Part #12557840) with red #262 Loctite and torque the bolt to 240/250 ft/lbs.
Note: All ATI LS1 dampers have one 3/16 keyway in the hub or ATI can key your existing damper.
Crank Pin Drill Fixture Kit for LS1
Part# 918993
Using ATI's crank pin drill fixture kit, you can install 1 or 2 dowel pins in the LS1 crank to eliminate the damper twist on the shaft - a must for engines used for circle track racing or supercharging!
Note: All drilling and reaming dry - no lubricants or cutting oils are necessary!
1. Remove the damper
2. Install the fixture to the crank and position 1 bushing hole for best drill access
3. Using the old crank bolt, lock the fixture to the crank so it can not move
4. Install the 11/64 bushing in the adapter and snug the holding screw
5. Using the 11/64 drill bit, drill through the crank to the center bore
6. Change the bushing to the 3/16 bushing and ream the 11/64 hole to 3/16 with one pass in and out at low RPM.
7. For a second pin at 180^, rotate the crank. Do not loosen bolt!
8. Repeat steps 4, 5, and 6 on the opposite side if you are installing 2 pins
9. Blow the outside and center bore clean of all chips before removing adapter. Then remove adapter.
10. Install the 3/16 pin , allowing it to protrude above the crank surface .093" to fit the keyway in the hub.
11. Install the damper and pull it tight to 200 ft/lbs with the old bolt
12. Install a new bolt (GM Part #12557840) with red #262 Loctite and torque the bolt to 240/250 ft/lbs.
Note: All ATI LS1 dampers have one 3/16 keyway in the hub or ATI can key your existing damper.
04-01-2007, 10:00 AM
#3
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OK-Thanks for your post. I am sure it will be used by others in the future. Now I can finish with bolting and aligning procharger bracket. Great forum! 
