Classic cars forum & vehicle restoration.
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ukdave2002
Joined: 23 Nov 2007 Posts: 4127 Location: South Cheshire
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Posted: Mon May 05, 2008 11:17 am Post subject: engineering tolerance question |
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I have aquired a number of slave cylinders for the morris 8, a few were badly scored so u/s, but a number of them have just light scoring or light rust, which I could ream or hone to rectify..
So a question for the engineers;
What would have been the tolerences be for a 7/8" (0.875") cylinder, when they were made?
Cheers Dave |
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Uncle Joe Guest
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Posted: Mon May 05, 2008 12:21 pm Post subject: |
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UK, this is not going to help you much, but: the tolerances for the cylinder is dependent on the piston tolerance when it was originally made. For pistons there are no less than 7 tolerances in general use.
I can hazard an educated guess though if you want... |
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Job-Rated
Joined: 23 Nov 2007 Posts: 1010 Location: Sugarbeet County
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Posted: Mon May 05, 2008 1:54 pm Post subject: |
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...And I'm more than happy to offer an uneducated one... _________________ Don't run your fingers over my truck & I won't run my truck over your fingers!
http://www.loosechange-band.co.uk/ |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4127 Location: South Cheshire
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Posted: Mon May 05, 2008 2:20 pm Post subject: |
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Thanks UJ, I doubt I could ever find out what the original piston tolerance was, I guess I looking for the "rule of thumb" that mechanics would have use in bygone times whaen they used to fix things !
I have just mesured the internals of all the cylinders and they range from; 0.873" to 0.878" don't know if this gives a clue? |
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Uncle Joe Guest
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Posted: Mon May 05, 2008 2:36 pm Post subject: |
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The usual thing is that from nominal, pistons are undersize, and cylinders are oversize.
The cylinder in a 0.875" would probably be max. 0.8737. ie 1.3 thou. bigger.
Having said that, if my memory serves me correctly, some manufacturers for a cylinder this size would recommend honing max. 2 thou larger than nominal. |
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