Re: reinstalling old piston and rings

Posted by dr.sportster on November 22, 2005 at 06:43:47 from (209.247.222.95):

In Reply to: reinstalling old piston and rings posted by jgeorge on November 21, 2005 at 14:54:43:

If you have the motor this far apart why just reassemble without rings?One thing not mentioned is after honing, cylinders need washing with detergent soap and water to clear the cross hatch of grit left from honing.In my opinion, to a certain degree, the piston is just a carrier for the rings.the rings do all the work of sealing.I have rerung extremly worn bores with used pistons and have had good sealing for a good while.A few passes with the dingleball hone to break the glaze should allow the new rings to seat.Wider than spec ring gap is an indication of cylinder wear.I was told in mechanics shool that rings rotate three times a minute in a running engine.I dont know that for sure but Im sure they do rotate.I would take sandpaper and break the glaze if you dont have a ball hone and at least replace rings.At least you will see a performance improvment from this.The end gap may line up in passing but as the rings further spin they unalign again.If not you would see a carbon spot in the top ring groove. Make sure grooves are carbon free by using a piece of broken ring if you have no groove tool.Follow installation instructions carefully top and second ring are two different designs in most motors.

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