briankd 817 #1 Posted December 25, 2020 i pulled the piston out of this 301 to replace the rod because i replaced the crank due to it being turned wrong. looking at the bore it has some score marks but cannot feel nothing running fingernail across them . piston skirt also had some scuffing but not worried about it . this only ran for roughly 3 hrs . should i not worry about it and put it back together? bore has crosshatch . i thought about running a hone thru it but i am planning on reuseing the piston and rings . any input on this apreceated Share this post Link to post Share on other sites
SylvanLakeWH 25,606 #2 Posted December 25, 2020 May want to check out this thread... 3 1 1 Share this post Link to post Share on other sites
Achto 27,622 #3 Posted December 25, 2020 11 hours ago, briankd said: i thought about running a hone thru it but i am planning on reuseing the piston and rings . any input on this apreceated Reusing rings is not a practice that I encourage. At 3hrs your rings should have have already started to seat & you will never get them back into the exact position that they were in. If it were mine, I would run a ball hone through the cylinder for a light scuff & use new rings. 5 Share this post Link to post Share on other sites
briankd 817 #4 Posted December 25, 2020 2 hours ago, SylvanLakeWH said: May want to check out this thread... that was my next step thanks 2 Share this post Link to post Share on other sites
briankd 817 #5 Posted December 25, 2020 1 minute ago, Achto said: Reusing rings is not a practice that I encourage. At 3hrs your rings should have have already started to seat & you will never get them back into the exact position that they were in. If it were mine, I would run a ball hone through the cylinder for a light scuff & use new rings. thanks i was thinking about that also . hate to half arse this engine and have to tear it down again for oil consumpsion Share this post Link to post Share on other sites
squonk 41,164 #6 Posted December 25, 2020 How about some pictures. Clyinder may be out of round causing the piston 'bang" back and forth. Scoring and scuffing are signs of poor lube and too great of a clearence. Share this post Link to post Share on other sites
briankd 817 #7 Posted December 25, 2020 3 hours ago, squonk said: How about some pictures. Clyinder may be out of round causing the piston 'bang" back and forth. Scoring and scuffing are signs of poor lube and too great of a clearence. i will pull the rings off the piston and check ring end gap. this block was bored to .020 unfortuanly was done by the same machine shop that did my crank and screwed it up if that is the case with this block i will give them a peice of my mind won't be pretty 1 Share this post Link to post Share on other sites
briankd 817 #8 Posted December 25, 2020 i pulled the top 2 rings off piston and measured them in the bore and it is .017 . according to the kouler spec that is ok. I remember now when i first fired this up after rebuild i didn't have the governor set right and it did run off went pretty high on rpm . like a dumb _ $$ . I hit the throttle a second time before i realized what was happening. maybe the over speed caused this? i will run a hone thru this and put new rings on it and the piston skirt i will lightly hit it with some fine scotch brite pad . and call it good .like i said i can't feel scratches with finger nail 1 Share this post Link to post Share on other sites
briankd 817 #9 Posted January 24, 2021 got her put back together today . the rod to crank has the correct clearance now after plasti gauging it has .0025 which is max on the kouler spec. need to get a battery in her and she should fire up . anything else goes to hell I may have this for sale 3 Share this post Link to post Share on other sites
