Ring wear

[aarolar]

Seems my K301 has been bored .010 over already, checking the bore it seems to be in spec and good to go. My confusion comes from the fact that the rings I removed from it one has .084 end gap and the other .054? Can the rings wear this bad with no cylinder wear or did someone put standard rings back in it when they rebuilt it?

[David a Calkins]

sounds like thats what they did ,,i ran into that on a .020 to .030 bore ,it must have used some oil

[aarolar]

Originally Posted by David a Calkins

sounds like thats what they did ,,i ran into that on a .020 to .030 bore ,it must have used some oil

Didn't really seem to but I didn't run it much before I tore it down so I don't really know. Did seem to smoke alittle but nothing serious, I don't even know how it was running truthfully the carb was in such horrible shape. Ill just plan to put new rings and deglaze then just seemed odd for just the rings to wear so badly.

[Jeff in Pa]

Originally Posted by aarolar

Seems my K301 has been bored .010 over already, checking the bore it seems to be in spec and good to go. My confusion comes from the fact that the rings I removed from it one has .084 end gap and the other .054? Can the rings wear this bad with no cylinder wear or did someone put standard rings back in it when they rebuilt it?

Let's see, standard bore is 3.375 so .010 over would be 3.385

The circumference of the +.010 bore is 10.634 and the standard bore is 10.603, a difference of .031

I would say somebody was completely clueless on proper gapping techinques and just plain screwed up.

Did you use the piston upside down to make sure the rings were square in the bore?

[Vince_o]

As far as the measuring, I leave it up to people like Jeff, Dale my buddy Phile that do this stuff all the time so I cant help you there.

I will say that yes the rings can wear with out wearing the bore. Its in one of Kohlers failure tests. Its due to over heating. I belive this is what the failure was on Dannys command. When I did the leak down on it I had about 98% compression on the #2 cylinder and on #1 it was just over 50% on kohlers guage. I do remember that that head had a mouse nest in it when I got the cyclops tractor I used as a doner.

[aarolar]

Originally Posted by Jeff in Pa

Let's see, standard bore is 3.375 so .010 over would be 3.385

The circumference of the +.010 bore is 10.634 and the standard bore is 10.603, a difference of .031

I would say somebody was completely clueless on proper gapping techinques and just plain screwed up.

Did you use the piston upside down to make sure the rings were square in the bore?

I used my calipers to push them down evenly all the way around same concept. It was also tripping me up that they were so much different.

[Jeff in Pa]

Originally Posted by aarolar

I used my calipers to push them down evenly all the way around same concept. It was also tripping me up that they were so much different.

Same end result just a little more time.

It's easier using a piston

[aarolar]

Originally Posted by Jeff in Pa

Same end result just a little more time.

It's easier using a piston

Agreed ill definitely use that trick next time.

[Vince_o]

Jeff

Thats how I do mine. Works real well and you know your in straight.

[Merk]

Did you measure the cylinder bore in 6 places like the Kohler manual shows?

What were the measurements if you did?

Dud you hone the cylinder bore?

Is it me or am I seeing up and down marks in the cylinder bore???? The up and down start about an inch down to the bottom on the cylinder wall. The piston skirt rides in that area. The cylinder may need bored if the marks are there. The engine will use oil unless the marks are removed.

Can you post of the piston????