CountryRock 199 #1 Posted August 11, 2018 I have a Briggs & Stratton 11hp, model 252417-0245-01. When I turn it over by hand, via the flywheel cover, it rotates about a half turn and then stops dead on something, does it no matter which way I turn it. Does this sound like a broken connecting rod or is it something else, that I could possibly fix? If it's not fixable, what could I use to repower the tractor it's on, a 1981 GT2500? I have 2 of these tractors, one of them does run, I would like to get this one running if possible. Thanks. Share this post Link to post Share on other sites
The Gman 476 #2 Posted August 11, 2018 It sounds like a conn. rod. Can you see down the plug hole at all, if the piston is moving? Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,251 #3 Posted August 11, 2018 Could be a stuck valve from sitting idle too long. Don't force it. Garry Share this post Link to post Share on other sites
CountryRock 199 #4 Posted August 11, 2018 I would like to have the service manual for this engine if possible. Thanks. Share this post Link to post Share on other sites
CountryRock 199 #5 Posted August 11, 2018 I could see the intake valve moving, couldn't see the piston. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,251 #6 Posted August 11, 2018 Engine service manual Garry 2 Share this post Link to post Share on other sites
CountryRock 199 #7 Posted August 11, 2018 Thank You, Garry! Share this post Link to post Share on other sites
The Gman 476 #8 Posted August 11, 2018 Might just as well pull the head. That won't hurt. Then you can see the piston and the valves Share this post Link to post Share on other sites
CountryRock 199 #9 Posted August 11, 2018 I think I'm going to do that shortly. Share this post Link to post Share on other sites
BOB ELLISON 2,981 #10 Posted August 11, 2018 I just had the same problem on a engine that sat for a long time. Turns out to be the piston ring was stuck to the piston and would not move in or out. It seized up the piston and would not allow it to move but a little. I hope this is your problem because it can be fixed by soaking. The only way to tell is to open it up. 1 Share this post Link to post Share on other sites
CountryRock 199 #11 Posted August 11, 2018 Head is off, piston and valves all move. Was a good mouse nest under the shroud, but nothing jamming the flywheel. 1 Share this post Link to post Share on other sites
The Gman 476 #12 Posted August 11, 2018 Good news. Maybe a good time to lap/check the valve clearance. Share this post Link to post Share on other sites
CountryRock 199 #13 Posted August 11, 2018 It still jams both ways. Share this post Link to post Share on other sites
CountryRock 199 #14 Posted August 11, 2018 Here's what it does. VID_20180811_162608552.mp4 Share this post Link to post Share on other sites
CountryRock 199 #15 Posted August 11, 2018 Under the breather cover. Share this post Link to post Share on other sites
cleat 7,030 #16 Posted August 11, 2018 I would pull the flywheel and make sure nothing is jammed under it, maybe stuck to a magnet. Share this post Link to post Share on other sites
The Gman 476 #17 Posted August 11, 2018 (edited) Maybe it's the angle but that exhaust spring doesn't look right. It's banked to the right. Almost like the keeper plate is shifted part way out of the slot. For sure pull the flywheel. Edited August 11, 2018 by The Gman Share this post Link to post Share on other sites
CountryRock 199 #18 Posted August 11, 2018 The exhaust valve does look off. I don't have tools to pull the flywheel. Share this post Link to post Share on other sites
Marv 966 #19 Posted August 11, 2018 Do you have pecans, hickory nuts, or walnuts at your place? You may just have one rolling around in the fly wheel and jamming things up. "Mice". Marv Share this post Link to post Share on other sites
CountryRock 199 #20 Posted August 11, 2018 9 minutes ago, Marv said: Do you have pecans, hickory nuts, or walnuts at your place? You may just have one rolling around in the fly wheel and jamming things up. "Mice". Marv None of those around. I don't think anything is jamming the flywheel. Share this post Link to post Share on other sites
CountryRock 199 #21 Posted August 12, 2018 Could it be something with the cam shaft gear? Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,251 #22 Posted August 12, 2018 11 hours ago, CountryRock said: Could it be something with the cam shaft gear? Sure. Check the pto side of the engine to make sure something over there isn't blocking it. Sure sounds solid whatever it is. You can likely push the top of the intake valve spring back into position. What is odd to me is if that had happened while running there should be substantial damage. What can happen internally when not running? Maybe remove engine from frame and turn it over (upside down) and see if it changes. Garry Share this post Link to post Share on other sites
The Gman 476 #23 Posted August 12, 2018 If you can't find anything external, pto/flywheel then you're gonaa have bite the bullet, drain the oil and remove the sump. Flywheel ,magnet(s) can come loose and get jambed. I listened to the video a few times and it sure sounds like a hard stop. A puller is best to remove a flywheel but you can do it with a pry bar under the flywheel for leverage and striking the nut with a small sledge. AFTER THE NUT IS LOOSENED AND RAISED A THREAD OR TWO ABOVE THE END OF THE CRANK. Search for some U-Tube videos on this method to see if you're comfortable with this first. Keep us posted Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,251 #24 Posted August 12, 2018 If you happen to remove the drive pulley on the output side here is the procedure to preload the thrust bearing - necessary on the B&S engines. Garry Share this post Link to post Share on other sites
Marv 966 #25 Posted August 12, 2018 1 hour ago, gwest_ca said: If you happen to remove the drive pulley on the output side here is the procedure to preload the thrust bearing - necessary on the B&S engines. Garry Very important. Marv Share this post Link to post Share on other sites
