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Old 08-11-2007, 12:18 PM   #1
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Default Play in supercharger pulley

How much play should I have in my pulley for the supercharger? I can move the pulley about a 1/2" left or right before you can feel the tension on the supercharger.
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Old 08-11-2007, 12:19 PM   #2
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There should be virtually none. You need a new coupler.

I'll move this to Forced Induction.
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Old 08-11-2007, 12:22 PM   #3
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[quote="J Wikoff"]There should be virtually none. You need a new coupler.

cool not as bad as I thought it would be.
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Old 08-11-2007, 12:28 PM   #4
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Is there any wobble or grinding when you turn it? That would indicate bearings, also.
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Old 08-11-2007, 12:38 PM   #5
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Not as bad? 1/2" is a HUGE amount of slop. They don't get much worse before they break.

In fact, 1/2" is just about the spacing between the steel pins if the coupler weren't even there. I would stop driving the car immediately.
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Old 08-11-2007, 12:48 PM   #6
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Quote:
Originally Posted by J Wikoff
Is there any wobble or grinding when you turn it? That would indicate bearings, also.
No just alot of play in the pulley.
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Old 08-11-2007, 12:55 PM   #7
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Quote:
Originally Posted by willwren
Not as bad? 1/2" is a HUGE amount of slop. They don't get much worse before they break.

In fact, 1/2" is just about the spacing between the steel pins if the coupler weren't even there. I would stop driving the car immediately.
The motor is out of the car. Because the car is off to the junk yard. Starting to work on the motor so it will be ready to drop in the cutlass for next summer. Should I rebuild the supercharger or just put a new coupler and Bearing kit in it?
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Old 08-11-2007, 12:55 PM   #8
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That'* what I'm talking about. If there'* play in the pulley, and it'* as you describe, the coupler is either extremely and dangerously worn, or already broken and nonexistent.

Stop driving the car immediately.

Read my supercharger page to understand it a bit better:

http://www.bonnevilleclub.com/forum/...rgers/how.html

Quote:
The DRIVE sequence of a setup like this is described rather simply: Belt drives pulley. Pulley spins input (nosedrive) shaft, . Behind the pulley is a seal to prevent Supercharger oil from escaping. Nosedrive shaft spins in two bearings lubricated by this oil. At the end of this shaft are 3 pins that lock into a flexible coupler (this coupler prevents gear damage by absorbing the shock load of a quick jump on the throttle, so the force flexes the coupler rather than break gear teeth). This coupler joins the input shaft to one of the rotor shafts via 3 identical pins. So when the input shaft spins, one rotor spins. Each rotor has an identical gear on it with a 1:1 ratio. So the two rotors spin in a counter-rotating fashion. One clockwise, the other counter-clockwise. The rotors shafts are sealed between the gear housing and compressor chamber for two reasons. One reason is to prevent manifold pressure (boost) from pressurizing the oil chamber (causing leaks) and the other is to prevent the oil from leaking into the compressor housing. Each rotor shaft is retained by a bearing on each end of the shaft.
The 3 pins on the gear can be clearly seen in this pic, and one of the mating pins in the nosedrive is also visible. There should be ZERO play in that pulley. The coupler is there to join them together.
http://www.bonnevilleclub.com/forum/...rs/m62open.JPG
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Old 08-11-2007, 01:02 PM   #9
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Quote:
Originally Posted by Dr.olds
Quote:
Originally Posted by willwren
Not as bad? 1/2" is a HUGE amount of slop. They don't get much worse before they break.

In fact, 1/2" is just about the spacing between the steel pins if the coupler weren't even there. I would stop driving the car immediately.
The motor is out of the car. Because the car is off to the junk yard. Starting to work on the motor so it will be ready to drop in the cutlass for next summer. Should I rebuild the supercharger or just put a new coupler and Bearing kit in it?
Rebuilding the SC IS the bearings and coupler. 4 bearings (you don't want to tackle the remaining 2) and the coupler.

www.rollingperformance.com

Be warned though, with that much slop, or a damaged/missing coupler, you could have already damaged the supercharger beyond rebuild/repair. Pull it apart to find out.
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Old 08-11-2007, 01:05 PM   #10
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Is this going to be a big job or not? Never worked with supercharger'* before just did alot of motor jobs and turbo kits.
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