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| Cooper Main Thrust Bearings https://www.ausmini.com/forums/viewtopic.php?f=2&t=81399 |
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| Author: | Gezo [ Sat May 11, 2013 4:55 pm ] |
| Post subject: | Cooper Main Thrust Bearings |
What are the largest Thrust Bearings you can use on a CooperS main Centre.My crank has a groove in the corner and will need severe machining. |
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| Author: | Gezo [ Sun May 12, 2013 6:00 am ] |
| Post subject: | Cooper Main Thrust Washer |
This was meant to be thrust washer. Too many beers. |
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| Author: | justminis [ Sun May 12, 2013 7:44 am ] |
| Post subject: | |
Chris, new thrust washers come in std, +.003" and +.030". The steel back of the washer can be surface ground (some) to get your desired clearance if these sizes do not do the job out of the packet. |
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| Author: | Gezo [ Sun May 12, 2013 10:42 am ] |
| Post subject: | |
The corner of the crank has a step in it. A big shame as the crank has standard thrusts and 10 bearings, being a genuine crank.Not sure if you can weld and grind the crank. |
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| Author: | Mick [ Sun May 12, 2013 12:28 pm ] |
| Post subject: | |
You would need to present the crank to the machininst along with the center main bearing cap and a set of the .030 over thrusts. But before you get the thrusts, work out if the damage isn't too great to be machined out. |
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| Author: | drmini in aust [ Sun May 12, 2013 12:53 pm ] |
| Post subject: | |
I would not get it ground right out to fit .030" thrusts, I would stop grinding when it's cleaned up, and surface grind the back of .030" thrusts to suit. Reason- +.030" is thickest size you can get- what will you do for thrusts next time.. 
[edit] and if it's going to get a rev past 6000, .003" endfloat is NOT enough on a 1275. You want .005-.006" at least. I found out the hard way. 
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