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Laser alignment of serpentine belts the right way

Old 03-21-2015, 08:08 PM
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Many thanks to D&C Vette for loaning me the laser alignment tool. I can see from the tool that I am off 2 ribs at 21 inches between my crank and blower pulley. I did not calibrate the laser tool though. I will do that using the supplied paper and see if it is still off.

For reference, I am using a SBC carbed vortech bracket on an 89 tpi car (for which this kit was discountinued) so I would expect there to be some mis-alignment. I had to grind on some of the brackets for clearance and this may have caused this mis-alignment but not sure.

I loosened the blower bolt and moved the blower pulley out enough to align the laser tool on the blower pulley and the crank pulley (both at the valley of the 2nd rib). It appears that i am about .230 off meaning the crank pulley is out further away from the centerline of the blower pulley by .230.


Is the preferred method to correct this to shim (with washers) the back of the blower bracket to move the blower forward towards the crank pulley (since the crank pulley is the centerline)


Shim the back side of the blower pulley to move the pulley out towards the front of the car and in alignment with the crank pulley? I would think using this method would put more strain on the blower shaft because the pulley is farther out from the blower?
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Old 10-17-2016, 03:26 PM
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I updated the original post with some more information about troubleshooting the alignment issue as well as solving it.
Thanks to Dennis from A&A for his input on this!
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Old 10-17-2016, 03:32 PM
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Thanks man I know this helped me.
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Old 05-28-2017, 05:27 PM
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Sorry to resurrect an old thread but I just wanted to thank BlownBlueZ06 for the alignment instructions. My tool was so far out of alignment out of the box it was sad.

I also wanted to share a slightly modified version of the method described I came up with when aligning the tool.

I found that marking the square with a marker by eye wasn't as accurate as I wanted it to be. In addition to that the laser produced a lot of glare on the flat shiny surface of the square making the black mark difficult to see.

I could have put a dot on some painters tape and stuck that to the square but of course I didn't have any painters tape left.

So I decided to print out some graph paper from the attached PDF, cut it out, and tape it to the square. Simply move the paper until the laser is in one of the boxes and tape it down. Then mark which box the laser is in. (Picture 1)

Then move the square to the end of the level and adjust the 4 allen screws until the laser is inside the marked box. (Picture 2)

The paper prevents the annoying glare and the blue lines can clearly be seen against the red laser. The adjustments were pretty touchy but I'm happy with the end result. (Picture 3)

The glare seen in pictures 1 and 2 is from the camera and isn't seen in person picture 3 is what you will see.
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Last edited by Krankshaft; 05-28-2017 at 06:07 PM.
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Old 05-27-2018, 12:52 PM
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So the graph paper would have to be employed AFTER a rough calibration using the cheap supplied paper guide, right? If not, then all that would be achieved with the graph paper is making the laser true along a straight line which is not necessarily the intended vector.
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