Hyakkimaru16
New member
- Joined
- Aug 13, 2023
- Messages
- 9
- Tractor
- Multiple small Kubota diesel engine machines
My name is Tristan and this will be my first thread on this site but, I'm excited to meet everybody. I have a Lincoln ranger 305d generator welder with a Kubota d722 3 cylinder diesel engine on it. I got it in a trade and I got other stuff as well but, I would like to get this thing working so it can be my new mobile welder rig. Well this particular engine comes with up to a 3,000 hour major engine parts warranty and I am barely over half of that. About 1800 hours. First thing I did was bleed all the air out of the fuel system and out of the injection system trying to crank it. Well after messing with it for quite a while and having no luck even spraying diesel directly into the intake, I did a compression test. Cylinder one, I assume it's cylinder one. It's on the flywheel side. 120 psi, cylinder 2 240 PSI, cylinder 3 350 PSI. Obviously there's problems. So I pull the motor and remove the head. The valves are rusted pretty good, and likely pitted although I have not removed them yet. The cylinders look like crap but I can't feel anything with my fingers. Everything feels smooth to the touch although it doesn't look great. A little while ago I was recommended to try some transmission fluid in the cylinders and turn it over with the starter for a bit to clean up some of the build up and see where I stand so, after doing that for about 10 minutes intermittently, this is what was left. Doesn't look great. The black spots at the top of the cylinders I can feel with my fingernail. I don't know if it's crud buildup or if it's a burn spot or what. I don't know if somebody ran gas through this thing, there's no telling. Again, the valves look terrible so I'm kind of tempted to rebuild the head and slap a head gasket on it and retest compression but, what do y'all think? I did make a short video showing off the cylinders and head before I did all of the stuff I've currently done and I will post a link to that as well. Let me know if you think I should just have the cylinders honed and put oversized Pistons or if I could get away with new standard pistons and rings and a light touch up hone or what. Let me know, thanks.
Everything but the first picture are from before turning it over with transmission fluid. The first picture is the after.
Everything but the first picture are from before turning it over with transmission fluid. The first picture is the after.
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