The Tuul Crib 7,339 #1 Posted September 30, 2019 I have this K1 81 that is driving me crazy. I turn the crank and it feels like something stops it and then you can turn it and it stops it again. I pulled the oil pan and looked inside and cannot see anything out of the ordinary. Any ideas what does could be ? Share this post Link to post Share on other sites
AMC RULES 37,196 #2 Posted September 30, 2019 Pull the head... are the valves sticking? Share this post Link to post Share on other sites
The Tuul Crib 7,339 #3 Posted September 30, 2019 10 minutes ago, AMC RULES said: Pull the head... are the valves sticking? I pulled ahead don't see any obstructions there. I pull the pan off and looked inside And could not see anything there. I am kind of baffled of what it could be. When you turn the crank it will stop and then you can turn it some more and it will turn again and then stop . Share this post Link to post Share on other sites
adsm08 3,261 #4 Posted September 30, 2019 Does it still do it with the head off? Share this post Link to post Share on other sites
wallfish 18,117 #5 Posted September 30, 2019 Just guessing but if you have the head and oil pan off and don't see anything obvious, maybe something in the crank to cam gears or a broken gear tooth? Share this post Link to post Share on other sites
WHX?? 51,773 #6 Posted September 30, 2019 Where does it hang up Cribs, compression, exhaust, power stroke? 1 Share this post Link to post Share on other sites
The Tuul Crib 7,339 #7 Posted September 30, 2019 Im not finding any broken teeth on the gears. It kind of feels almost like its dry inside if that makes sense.You turn the crank a little bit and then hit friction and then turn it past that point and then friction again. When l get more time ill go in to in more detail. Share this post Link to post Share on other sites
pacer 3,177 #8 Posted September 30, 2019 With the recent post on flywheel magnets --- maybe one got a piece broke off and is dragging ------- nah! more I think about it that would just lock it up completely . Hmmmmm...... Share this post Link to post Share on other sites
The Tuul Crib 7,339 #9 Posted September 30, 2019 3 hours ago, pacer said: With the recent post on flywheel magnets --- maybe one got a piece broke off and is dragging ------- nah! more I think about it that would just lock it up completely . Hmmmmm...... Well this is off the same motor. What's funny is I just picked up another 12 horse pulled off the fly wheel on it and all the magnets were stuck to the stater. I make sure to Mark those before I pulled them off! Share this post Link to post Share on other sites
gt14rider 947 #10 Posted September 30, 2019 Check the cam, had similar problem on my k181, cam or pin was bent, swapped out with a different cam and pin fixed it. 2 Share this post Link to post Share on other sites
Shynon 7,482 #11 Posted October 1, 2019 Pull the rod cap off and see if the rod has spun on the crank Share this post Link to post Share on other sites
WHX?? 51,773 #12 Posted October 1, 2019 10 minutes ago, Shynon said: Pull the rod cap off and see if the rod has spun on the crank You got the pan off you always pop off the big end for inspection and a few dims Cribs. 1 Share this post Link to post Share on other sites
953 nut 60,069 #13 Posted October 1, 2019 When you rotate the crank shaft are you seeing the valves open and close? Could be a broken cam shaft. Share this post Link to post Share on other sites
The Tuul Crib 7,339 #14 Posted October 1, 2019 20 minutes ago, 953 nut said: When you rotate the crank shaft are you seeing the valves open and close? Could be a broken cam shaft. Valves are moving fine . I hoping not to tare this one down. Its possible that it could be a sticky valve. Share this post Link to post Share on other sites
Mudrig150 331 #15 Posted October 1, 2019 6 hours ago, The Tool Crib said: Valves are moving fine . I hoping not to tare this one down. Its possible that it could be a sticky valve. How far does it turn before it meets friction? That'll help narrow it down. Share this post Link to post Share on other sites
The Tuul Crib 7,339 #16 Posted October 1, 2019 8 minutes ago, Mudrig150 said: How far does it turn before it meets friction? That'll help narrow it down. About a quarter of a turn Share this post Link to post Share on other sites
Mudrig150 331 #17 Posted October 1, 2019 (edited) So every 90 degrees? Edited October 1, 2019 by Mudrig150 Share this post Link to post Share on other sites
The Tuul Crib 7,339 #18 Posted October 1, 2019 10 minutes ago, Mudrig150 said: So every 90 degrees? Yes Share this post Link to post Share on other sites
Mudrig150 331 #19 Posted October 1, 2019 Something is probably wrong with the cylinder walls or the crank. Pull the rod cap and see how it looks. 1 Share this post Link to post Share on other sites
bc.gold 3,406 #20 Posted October 1, 2019 1 minute ago, The Tool Crib said: Yes Then its not cam or valve train related. Share this post Link to post Share on other sites
The Tuul Crib 7,339 #21 Posted October 1, 2019 I'm going to pull the rod cap When I get home and see what's going on with the crankshaft first and then go from there. Share this post Link to post Share on other sites
The Tuul Crib 7,339 #22 Posted October 1, 2019 OK so I got home flipped the motor over took the rod cap off and pulled the piston out. Problem solved the crank turns freely once again. Now. Looking in the cylinder I can still see the crosshatches. The piston is stamped STD. My thought is to hone it out a little put new rings in it and I'm good to go Share this post Link to post Share on other sites
AMC RULES 37,196 #23 Posted October 1, 2019 So, is the bore out of round? Share this post Link to post Share on other sites
The Tuul Crib 7,339 #24 Posted October 1, 2019 22 minutes ago, AMC RULES said: So, is the bore out of round? 22 minutes ago, AMC RULES said: So, is the bore out of round? Not sure. I pulled the rings off the piston and it moved freely inside the cylinder. Share this post Link to post Share on other sites
bc.gold 3,406 #25 Posted October 1, 2019 Are the ring lands free of carbon. 1 Share this post Link to post Share on other sites
