sqrlgtr 573 #1 Posted August 23, 2020 (edited) Have this 310-8 that runs and seems to have plenty of power,but smokes alot and drinks oil.Im thinking broke ring,could it be something else?This little ol tractor never fails to start and run but thinking about putting new set of rings in it.Also have a magnum 12 that could replace the mag 10 thats on it. Ttying to decide which path has the least resistance.BTW the mag 12 will have to have Rebuilt/new carb on it before it would be dependable.Any thoughts? Edited August 23, 2020 by sqrlgtr Fogit pic 1 Share this post Link to post Share on other sites
roadapples 6,983 #2 Posted August 23, 2020 I'd use the 12 and rebuild the 10 at your leisure.... 4 Share this post Link to post Share on other sites
bds1984 1,469 #3 Posted August 23, 2020 I just bought a 312-8 a couple weeks ago with 1100 hours on the clock and it looks like they were some hard hours, too. Same scenario, drinks oil and smokes like a mosquito fogger, but starts/runs/drives well. After some deep cleaning I discovered the head gasket was leaking so I pulled off the head to replace it and there I found some deep scoring on the cylinder walls but no broken rings. You could be in the same situation but most likely wont know until you tore the engine down like I did. It'll take a 0.030" oversized piston to clear this engine up. The path of least resistance for me would be to swap the M12 in, use the M10's carb if you can, and then work on rebuilding the M10 as time goes by. 5 Share this post Link to post Share on other sites
peter lena 9,110 #4 Posted August 23, 2020 bds1984, agree with the , m12 swap, pretty easy , and also a good time to freshen up related areas , wiring issues, thorough service , you might also use a ( rislone engine restore oil treatment ) along with a couple of hot oil changes to help clean out the residue and varnish build up , also helps out on any smokey issues, walmart usually has a good selection. also some aerosol penetrating oil on a clean cloth to rub down the paint, it will stop the rusting and feed and help restore that paint . done this a few times , and it has worked out for me , good luck with it , pete Share this post Link to post Share on other sites
Ed Kennell 40,697 #5 Posted August 23, 2020 Check the crankcase for pressure. If you don't feel a vacuum, clean the breather. Share this post Link to post Share on other sites
sqrlgtr 573 #6 Posted August 23, 2020 Ive been studying about it and it looks like it would be a straightforward engine swap.I cant think of anything that would stop me from unbolting the 10 and bolting the 12 right in its place. 1 Share this post Link to post Share on other sites
953 nut 58,295 #7 Posted August 24, 2020 18 hours ago, sqrlgtr said: thinking about putting new set of rings in it. 14 hours ago, sqrlgtr said: Ive been studying about it and it looks like it would be a straightforward engine swap.I cant think of anything that would stop me from unbolting the 10 and bolting the 12 right in its place. It will probably require more than a set of rings for "Ol-smokey". The wall of the cylinder on the M-10 are probably in need of some machining. If the M-12 came from a there should be no problem swapping it out and using the present carburetor. Share this post Link to post Share on other sites
The Tuul Crib 7,338 #8 Posted August 24, 2020 I would definitely go for the engine swap. as majority says it is much easier to swap out and be up and running in a day or two verses downtime rebuilding an engine because it does take a while. Got to order parts go to the machine shop back and forth. Did the M 12 come off another wheel horse? Share this post Link to post Share on other sites
sqrlgtr 573 #9 Posted August 24, 2020 Should have mentioned the 12 is going to be donated by a 312-8 WH 😁.Should be a drop in..... 1 Share this post Link to post Share on other sites
