dirtdonkey
Member
I recently rebuilt my Yanmar 3110D. The tractor runs great after the rebuild. I installed a new piston in number one cylinder. New rings in the remaining 2 cylinders. Head was redone with new valves in Cylinder 1. Head was planed so it is flat. The block was checked and it is flat also. I was mowing today, 6' Rhino mower, and motor was running 2000 to 2400 RPM most of the time. Temperature guage reads 190 degrees at its hottest. Overflow tank was empty when I started mowing and continued to get fluid from radiator coming in to it and was bubbling in the overflow tube. I have a remote sensor temp guage and checked everything when I noticed the overheat. Radiator showed 140, water pump area showed 180, head showed 190, exhaust area of head was highest and at one point right at exhaust area of #3 temp was 240. Hard to tell weather the fluid side is that hot or not and temp would vary depending upon where you got the reading. That is the only area I could find that was over 210 anywhere. This was after running for over an hour mowing grass. I'm wondering if I don't have a bad radiator and cap fit, even though I just installed them new, when I rebuilt the motor? Really can't figure out why its overheating. Was thinking about adding another shim to the injector pump to ****** the timing but timing appeared correct when I did the reubild and checked it. Any suggestions greatly appreciated.