Adrian,
Pistons are usually fitted (or should be) to one ten thousandths of an inch
by honing to size after the machinist measures each individual piston. If
he bored it and then you bought pistons, that could be the problem (pistons
aren't always exactly the same size). Did you measure the piston to
cylinder bore clearance with a feeler guage before installing the rings on
the piston? What about ring end-gap (are ring ends butting together when
inserted in the cylinder by themselves? - are they the right rings?) Did
the rings or pistons get damaged on installation? If in doubt on any of
this, pull it apart and check everything (or have everything checked by a
competent machinist). It's much easier to do it now and could keep you
from having to buy another set of pistons and further machine work. Never
settle for anything less than perfection on the bottom end.
Les
At 11:09 AM 6/14/98 -0400, you wrote:
>I finally got around to doing some work on the engine reassembly today.
>All the pistons are in and 3 are relatively free-moving, but the first
>one is hard to move. Is this normal and maybe I just don't have enough
>oil in there, or is something binding? All the pistons went in with the
>same characteristics (none were any harder than the others to get in).
>Could the bore not be exact (.020 over)? What else could it be? There
>aren't any scratch or scuff marks in the cylinder. Thanks!
>
>adrian
>
>--
>-----------------------------------
>J. Adrian Barnes
>adrian@icx.net
>
>http://user.icx.net/~adrian/midget
>http://www.ravineware.com
>-----------------------------------
>
>
>
>
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