joel_400 59 #1 Posted February 22, 2014 I just picked up a Yanmar L100 today. The guy i got it from said it just quit running a month or so ago. Then it would start and stall. It was real cold when it happened, kinda wondering if maybe the fuel gelled? Not sure though. Any way they tore it partially apart. Removed the head and tore it all apart. The piston has a little play but not too much I dont believe. I will check into that soon though. I was almost thinking to get a gasket kit and put it back together to properly diagnose the issue, but then I may have to tear it back apart. However I may just get lucky too... Just wondering if anybody on here has any experience with these engines and could maybe point me in the proper direction so I dont waste too much time. Any input on this would be greatly appreciated! I want it to rattle and stink soon so I can make a smokin' horse. Joel Share this post Link to post Share on other sites
WH nut 553 #2 Posted February 22, 2014 I would try putting it back together with what you have and try it, unless the head gasket was destroyed you might be able to find out what you have without spending a bunch of money just to Diag it. Share this post Link to post Share on other sites
sorekiwi 761 #3 Posted February 22, 2014 (edited) The L100 manual is online in a lot of places, I have it if you need me to email it to you. It may be of some help to look at pictures of my Chinese clone in this thread: I haven't actually seen inside a real Yanmar, but have been told that they are very close, just a whole lot nicer. I did use the Yanmar manual to put mine back together. EDIT: The manual is too large to upload to the "Manuals" section here, so here is a link: http://dawinfo.com/L-A-Service-Manual/L-A-Manual-Complete.pdf Edited February 22, 2014 by sorekiwi Share this post Link to post Share on other sites
joel_400 59 #4 Posted February 22, 2014 I downloaded and printed the manual already. Lot of good info there. I think I will need at least a head gasket to put it back together. From what ive seen on fleabay everybody is claiming chinese gaskets will work. And are cheaper. So I figured I would go that route for now. Thanks for the input I'm hoping to find someone that has some experience with these. Maybe then I would know what to look into first. I will keep you guys notified as to what I find. Joel Share this post Link to post Share on other sites
sorekiwi 761 #5 Posted February 22, 2014 The head gasket on my clone was just a big copper washer. I reused it. Unless your one shows some damage, I would be temped to just put it back on. The engine itself is pretty simple. Not having very much diesel experience, I am struggling a little getting the governor/fueling set up correctly, its a very fine line between not enough fuel and belching black smoke. But I am sure it is my lack of knowledge that is hurting me there. Share this post Link to post Share on other sites
joel_400 59 #6 Posted March 3, 2014 Well I put the yanmar back together. Cant get it started. I did run a compression check and found only 200 lbs of compression. Everything else seems to be ok. I ran the fuel line into a coffee can and Im getting fuel. Then hooked injector up to the fuel line a rolled it over that seems to be getting fuel thru it also. I did find comp limits somewhere but cant find them again. I think 200 seems to be half of what Im supposed to have Im not sure though, Im a newbie to rattle and stink motors. Any input would be appreciated. Also I couldnt even get it to kick on ether. Joel Share this post Link to post Share on other sites
sorekiwi 761 #7 Posted March 3, 2014 The manual I have here specifies 284 psi as the lower limit (with recoil start) or 356 psi (for electric start). I'm not sure I could pull my engine over with the recoil without using the compression release lever. My engine needs to have the fuel to the injector well bled before it will start. I crack the fitting loose and turn it with the recoil (compression release held open) a few turns till I get good fuel right at the injector. The other thing to check would be the fuel timing. There should be timing marks on the flywheel, and you roll the engine over to see where it squirts the fuel. Timing is adjusted with shims under the fuel pump. It is well documented in the manual. That's all I got, good luck! Share this post Link to post Share on other sites
WH nut 553 #8 Posted March 3, 2014 (edited) Give it a shot of starting fluid and see if she farts, that would eliminate fuel, but 200 psi sounds low to me. Edited March 3, 2014 by WH nut Share this post Link to post Share on other sites
