[euro911sc]

Andy's comments from this thread: http://forums.pelicanparts.com/showthread.php?t=388461

Originally Posted by Eagledriver

The maximum allowable clearance is .004 inches. This is the wear limit. It can be measured with the old rings as they don't wear on the top and bottom, only on the edge that touches the cylinder. The top ring clearance is always the largest so if the top ring is good the rest will be good. The gap is largest at the 6 and 12 position.

I'm a big fan of re-using the old rings provided they are kept on the same pistons and cylinders. I've had brand new Goetz rings that had larger end gaps than the used rings that came off the pistons. I've used old rings on several of my engines with no problems. In addition if you use the old rings the wear limit on the ring land clearance is not as critical. It's new rings on pistons with excessive side clearance that cause problems.

You can buy replacement pistons but getting the proper running clearance is not easy. There are several different diameter groups for each size cylinder. You have to match the pistons to the cylinders by these groups. It's really best to keep the sets together if possible.

-Andy

What I am concerned about is I blew one piston and replaced it with similar weight group piston. Then had to replace 3 cylinders due to scarring of the sealing surfaces... I have the correct height group. Andy's comments, above, about matching diameter groups have me very worried now... and I JUST closed up the heads today



Please don't tell me I have to tear it down again NOTE: I have a set of Henry's trick 906 replica air deflectors at the coater. I can put these in after the heads are on unlike the regular ones.

Best regards,

Michael