Classic cars forum & vehicle restoration.

[ukdave2002]

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

[Uncle Joe]

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is not going to help you much, but: the tolerances for the cylinder is dependent on the piston tolerance when it was originally made.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...

[Job-Rated]

...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/

[ukdave2002]

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?

[Uncle Joe]

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.